diff --git a/modules/companies/src/api/application/companies/public/services/index.ts b/modules/companies/src/api/application/companies/public/services/index.ts
index b36e6fea..dbf3343d 100644
--- a/modules/companies/src/api/application/companies/public/services/index.ts
+++ b/modules/companies/src/api/application/companies/public/services/index.ts
@@ -1,2 +1,3 @@
 export * from "./company-public-finder";
 export * from "./company-public-services";
+export * from "./initial-company-creator";
diff --git a/modules/companies/src/api/application/companies/public/services/initial-company-creator.test.ts b/modules/companies/src/api/application/companies/public/services/initial-company-creator.test.ts
new file mode 100644
index 00000000..10a6c98a
--- /dev/null
+++ b/modules/companies/src/api/application/companies/public/services/initial-company-creator.test.ts
@@ -0,0 +1,145 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { DuplicateEntityError } from "@erp/core/api";
+import type { IAudit } from "@repo/rdx-audit";
+import {
+  City,
+  CountryCode,
+  Name,
+  PostalAddress,
+  PostalCode,
+  Province,
+  Street,
+  TextValue,
+  UniqueID,
+  UtcDate,
+} from "@repo/rdx-ddd";
+import { Collection, Maybe, Result } from "@repo/rdx-utils";
+
+import type { Company } from "../../../../domain";
+import { CompanySlug } from "../../../../domain";
+import type { ICompanyRepository } from "../../contracts";
+import { CompanyCreator } from "../../services/company-creator";
+
+import { InitialCompanyCreator } from "./initial-company-creator";
+
+const address = () =>
+  PostalAddress.create({
+    street: Maybe.some(Street.create("Calle Mayor 1").data),
+    street2: Maybe.none(),
+    city: Maybe.some(City.create("Madrid").data),
+    postalCode: Maybe.some(PostalCode.create("28001").data),
+    province: Maybe.some(Province.create("Madrid").data),
+    countryCode: Maybe.some(CountryCode.create("ES").data),
+  }).data;
+const input = () => ({
+  legalName: Name.create("Rodax").data,
+  tin: TextValue.create("B12345678").data,
+  address: address(),
+});
+
+function setup(error?: Error, duplicate = false) {
+  const saved: Company[] = [];
+  const transactions: unknown[] = [];
+  const repository: ICompanyRepository = {
+    save: async (company, transaction) => {
+      transactions.push(transaction);
+      if (error) return Result.fail(error);
+      saved.push(company);
+      return Result.ok();
+    },
+    update: async () => Result.ok(),
+    findById: async () => Result.ok(Maybe.none()),
+    findBySlug: async (_slug, transaction) => {
+      transactions.push(transaction);
+      return Result.ok(duplicate ? Maybe.some(saved[0]) : Maybe.none());
+    },
+    existsActiveById: async () => Result.ok(false),
+    findActiveByIds: async () => Result.ok(new Collection([])),
+  };
+  const audit: IAudit = {
+    record: async () => Result.ok(),
+    recordEvent: async () => Result.ok(),
+    recordMutation: async () => Result.ok(),
+  };
+  return {
+    capability: new InitialCompanyCreator(new CompanyCreator(repository, audit)),
+    saved,
+    transactions,
+  };
+}
+
+test("crea con id, slug, status y fechas internos y persiste dirección completa", async (t) => {
+  const now = UtcDate.createFromISO("2026-09-07").data;
+  t.mock.method(UtcDate, "today", () => now);
+  const { capability, saved } = setup();
+  const params = input();
+  const result = await capability.create(params);
+  assert.equal(result.isSuccess, true);
+  const company = saved[0];
+  assert.equal(UniqueID.create(result.data.companyId).isSuccess, true);
+  assert.equal(result.data.companyId, company.id.toPrimitive());
+  assert.equal(result.data.slug, `company-${company.id.toPrimitive()}`);
+  assert.equal(CompanySlug.create(result.data.slug).isSuccess, true);
+  assert.equal(company.status.isActive(), true);
+  assert.equal(company.createdAt, now);
+  assert.equal(company.updatedAt, now);
+  assert.equal(company.address.unwrap(), params.address);
+  assert.equal(company.tin.unwrap(), params.tin);
+  assert.deepEqual(Object.keys(result.data).sort(), ["companyId", "slug"]);
+});
+
+test("nombres iguales generan IDs y slugs distintos", async () => {
+  const { capability } = setup();
+  const first = await capability.create(input());
+  const second = await capability.create(input());
+  assert.equal(first.isSuccess, true);
+  assert.equal(second.isSuccess, true);
+  assert.notEqual(first.data.companyId, second.data.companyId);
+  assert.notEqual(first.data.slug, second.data.slug);
+});
+
+for (const field of ["street", "city", "postalCode", "province", "countryCode"] as const) {
+  test(`rechaza dirección sin ${field} antes de persistir`, async () => {
+    const { capability, saved, transactions } = setup();
+    const incomplete = PostalAddress.create({
+      ...address().getProps(),
+      [field]: Maybe.none(),
+    }).data;
+    const result = await capability.create({ ...input(), address: incomplete });
+    assert.equal(result.isFailure, true);
+    assert.equal(saved.length, 0);
+    assert.equal(transactions.length, 0);
+  });
+}
+
+test("propaga transaction al chequeo de slug y save", async () => {
+  const { capability, transactions } = setup();
+  const transaction = {};
+  const result = await capability.create({ ...input(), transaction });
+  assert.equal(result.isSuccess, true);
+  assert.deepEqual(transactions, [transaction, transaction]);
+});
+
+for (const error of [
+  new Error("persistence failed"),
+  new DuplicateEntityError("Company", "slug", "duplicate"),
+]) {
+  test(`propaga error repository ${error.name}`, async () => {
+    const { capability } = setup(error);
+    const result = await capability.create(input());
+    assert.equal(result.isFailure, true);
+    assert.equal(result.error, error);
+  });
+}
+
+test("conflicto de slug conserva el rechazo de CompanyCreator", async () => {
+  const { capability, saved } = setup(undefined, true);
+  const first = setup();
+  await first.capability.create(input());
+  saved.push(first.saved[0]);
+  const result = await capability.create(input());
+  assert.equal(result.isFailure, true);
+  assert.equal(saved.length, 1);
+});
diff --git a/modules/companies/src/api/application/companies/public/services/initial-company-creator.ts b/modules/companies/src/api/application/companies/public/services/initial-company-creator.ts
new file mode 100644
index 00000000..f31a4f85
--- /dev/null
+++ b/modules/companies/src/api/application/companies/public/services/initial-company-creator.ts
@@ -0,0 +1,84 @@
+import type {
+  EmailAddress,
+  Name,
+  PhoneNumber,
+  PostalAddress,
+  TextValue,
+  URLAddress,
+} from "@repo/rdx-ddd";
+import { UniqueID, UtcDate } from "@repo/rdx-ddd";
+import { Maybe, Result } from "@repo/rdx-utils";
+
+import { CompanySlug, CompanyStatus } from "../../../../domain";
+import type { ICompanyCreator } from "../../services/company-creator";
+
+export interface CreateInitialCompanyParams {
+  legalName: Name;
+  tradeName?: Name;
+  tin: TextValue;
+  email?: EmailAddress;
+  phone?: PhoneNumber;
+  website?: URLAddress;
+  address: PostalAddress;
+  transaction?: unknown;
+}
+
+export interface InitialCompanyPublicModel {
+  companyId: string;
+  slug: string;
+}
+
+export interface IInitialCompanyCreator {
+  create(params: CreateInitialCompanyParams): Promise<Result<InitialCompanyPublicModel, Error>>;
+}
+
+export class InitialCompanyCreator implements IInitialCompanyCreator {
+  public constructor(private readonly creator: ICompanyCreator) {}
+
+  public async create(
+    params: CreateInitialCompanyParams
+  ): Promise<Result<InitialCompanyPublicModel, Error>> {
+    const address = params.address;
+    if (
+      !address ||
+      [
+        address.street,
+        address.city,
+        address.postalCode,
+        address.province,
+        address.countryCode,
+      ].some((part) => part.isNone())
+    ) {
+      return Result.fail(new Error("Initial company requires a complete postal address."));
+    }
+
+    const id = UniqueID.generateNewID();
+    // El ID interno mantiene el slug estable y distingue empresas con el mismo nombre.
+    const slug = CompanySlug.create(`company-${id.toPrimitive()}`);
+    if (slug.isFailure) return Result.fail(slug.error);
+    const now = UtcDate.today();
+    const created = await this.creator.create({
+      id,
+      transaction: params.transaction,
+      props: {
+        legalName: params.legalName,
+        tradeName: Maybe.fromNullable(params.tradeName),
+        tin: Maybe.some(params.tin),
+        email: Maybe.fromNullable(params.email),
+        phone: Maybe.fromNullable(params.phone),
+        website: Maybe.fromNullable(params.website),
+        address: Maybe.some(address),
+        slug: slug.data,
+        status: CompanyStatus.createActive(),
+        defaultPaymentTermId: Maybe.none(),
+        createdAt: now,
+        updatedAt: now,
+      },
+    });
+    if (created.isFailure) return Result.fail(created.error);
+    return Result.ok({
+      companyId: created.data.id.toPrimitive(),
+      slug: created.data.slug.toPrimitive(),
+    });
+  }
+}
diff --git a/modules/onboarding/src/api/application/repositories/initial-onboarding-repository.interface.ts b/modules/onboarding/src/api/application/repositories/initial-onboarding-repository.interface.ts
new file mode 100644
index 00000000..d464577a
--- /dev/null
+++ b/modules/onboarding/src/api/application/repositories/initial-onboarding-repository.interface.ts
@@ -0,0 +1,15 @@
+import type { UniqueID } from "@repo/rdx-ddd";
+import type { Maybe, Result } from "@repo/rdx-utils";
+
+import type { InitialOnboarding } from "../../domain";
+
+export interface IInitialOnboardingRepository {
+  /** Devuelve ausencia explícita si la cuenta no tiene onboarding; no es un error. */
+  findByAccountId(
+    accountId: UniqueID,
+    transaction?: unknown
+  ): Promise<Result<Maybe<InitialOnboarding>, Error>>;
+
+  /** Persiste el estado actual del agregado, tanto pending como completed. */
+  save(initialOnboarding: InitialOnboarding, transaction?: unknown): Promise<Result<void, Error>>;
+}
diff --git a/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.test.ts b/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.test.ts
new file mode 100644
index 00000000..17276d48
--- /dev/null
+++ b/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.test.ts
@@ -0,0 +1,193 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { DuplicateEntityError } from "@erp/core/api";
+import { UniqueID, UtcDateTime } from "@repo/rdx-ddd";
+import { Maybe, Result } from "@repo/rdx-utils";
+
+import { InitialOnboarding } from "../../domain";
+import type { IInitialOnboardingRepository } from "../repositories/initial-onboarding-repository.interface";
+
+import { InitialOnboardingProvisioner } from "./initial-onboarding-provisioner";
+
+const accountId = UniqueID.create("22222222-2222-4222-8222-222222222222").data;
+const duplicate = () =>
+  new DuplicateEntityError("InitialOnboarding", "accountId", accountId.toPrimitive());
+
+class FakeRepository implements IInitialOnboardingRepository {
+  public stored: InitialOnboarding | undefined;
+  public reads = 0;
+  public writes = 0;
+  public readError: Error | undefined;
+  public writeError: Error | undefined;
+  public winner: InitialOnboarding | undefined;
+  public rereadError: Error | undefined;
+  public async findByAccountId(id: UniqueID): Promise<Result<Maybe<InitialOnboarding>, Error>> {
+    assert.ok(id.equals(accountId));
+    this.reads++;
+    if (this.readError) return Result.fail(this.readError);
+    if (this.reads > 1 && this.rereadError) return Result.fail(this.rereadError);
+    return Result.ok(Maybe.fromNullable(this.stored));
+  }
+  public async save(value: InitialOnboarding): Promise<Result<void, Error>> {
+    this.writes++;
+    if (this.winner) this.stored = this.winner;
+    if (this.writeError) return Result.fail(this.writeError);
+    this.stored = value;
+    return Result.ok();
+  }
+}
+function existing(completed = false) {
+  const value = InitialOnboarding.createPending(accountId).data;
+  if (completed) {
+    const timestamp = UtcDateTime.createFromISO("2026-01-02T10:30:00.123Z").data;
+    assert.equal(
+      value.complete({
+        companyId: UniqueID.generateNewID(),
+        completedAt: timestamp,
+        updatedAt: timestamp,
+      }).isSuccess,
+      true
+    );
+  }
+  return value;
+}
+
+test("inexistente crea y guarda pending mediante el agregado", async () => {
+  const repository = new FakeRepository();
+  const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+  assert.equal(result.isSuccess, true);
+  assert.equal(result.data, repository.stored);
+  assert.equal(result.data.status, "pending");
+  assert.ok(result.data.accountId.equals(accountId));
+  assert.ok(result.data.createdAt.equals(result.data.updatedAt));
+  assert.ok(result.data.companyId.isNone());
+  assert.ok(result.data.completedAt.isNone());
+  assert.equal(repository.writes, 1);
+});
+
+for (const completed of [false, true]) {
+  test(`existente ${completed ? "completed" : "pending"} conserva identidad y estado sin save`, async () => {
+    const repository = new FakeRepository();
+    const value = existing(completed);
+    repository.stored = value;
+    const before = [value.id, value.createdAt, value.updatedAt, value.companyId, value.completedAt];
+    const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+    assert.equal(result.data, value);
+    assert.equal(result.data.status, completed ? "completed" : "pending");
+    assert.deepEqual(
+      [value.id, value.createdAt, value.updatedAt, value.companyId, value.completedAt],
+      before
+    );
+    assert.equal(repository.writes, 0);
+  });
+}
+
+test("error de find inicial se propaga sin save", async () => {
+  const repository = new FakeRepository();
+  repository.readError = new Error("read failed");
+  const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, repository.readError);
+  assert.equal(repository.writes, 0);
+});
+
+test("error de save no duplicate se propaga sin releer", async () => {
+  const repository = new FakeRepository();
+  repository.writeError = new Error("write failed");
+  const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, repository.writeError);
+  assert.equal(repository.reads, 1);
+});
+
+for (const completed of [false, true]) {
+  test(`duplicate devuelve ganador ${completed ? "completed" : "pending"} tras una relectura`, async () => {
+    const repository = new FakeRepository();
+    repository.writeError = duplicate();
+    repository.winner = existing(completed);
+    const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+    assert.equal(result.isSuccess, true);
+    assert.equal(result.data, repository.winner);
+    assert.equal(repository.reads, 2);
+    assert.equal(repository.writes, 1);
+  });
+}
+
+test("duplicate y relectura fallida propaga el error de lectura", async () => {
+  const repository = new FakeRepository();
+  repository.writeError = duplicate();
+  repository.rereadError = new Error("reread failed");
+  const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, repository.rereadError);
+  assert.equal(repository.reads, 2);
+});
+
+test("duplicate y relectura none retorna error explícito con causa", async () => {
+  const repository = new FakeRepository();
+  repository.writeError = duplicate();
+  const result = await new InitialOnboardingProvisioner(repository).provision(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(
+    result.error.message,
+    "Initial onboarding duplicate without a persisted onboarding for the account."
+  );
+  assert.equal(result.error.cause, repository.writeError);
+  assert.equal(repository.reads, 2);
+  assert.equal(repository.writes, 1);
+});
+
+test("provision repetido devuelve el mismo agregado y timestamps", async () => {
+  const repository = new FakeRepository();
+  const provisioner = new InitialOnboardingProvisioner(repository);
+  const first = await provisioner.provision(accountId);
+  const second = await provisioner.provision(accountId);
+  const third = await provisioner.provision(accountId);
+  assert.equal(first.isSuccess, true);
+  assert.equal(second.data, first.data);
+  assert.equal(third.data, first.data);
+  assert.equal(repository.writes, 1);
+});
+
+test("dos provision simultáneos con barrera devuelven un único ganador", async () => {
+  let release: () => void = () => {
+    throw new Error("Barrier not initialized");
+  };
+  const barrier = new Promise<void>((resolve) => {
+    release = resolve;
+  });
+  let reads = 0;
+  let writes = 0;
+  let stored: InitialOnboarding | undefined;
+  const repository: IInitialOnboardingRepository = {
+    async findByAccountId(id) {
+      assert.ok(id.equals(accountId));
+      reads++;
+      if (reads <= 2) {
+        if (reads === 2) release();
+        await barrier;
+        return Result.ok(Maybe.none());
+      }
+      return Result.ok(Maybe.fromNullable(stored));
+    },
+    async save(value) {
+      writes++;
+      if (stored) return Result.fail(duplicate());
+      stored = value;
+      return Result.ok();
+    },
+  };
+  const provisioner = new InitialOnboardingProvisioner(repository);
+  const [first, second] = await Promise.all([
+    provisioner.provision(accountId),
+    provisioner.provision(accountId),
+  ]);
+  assert.equal(first.isSuccess, true);
+  assert.equal(second.isSuccess, true);
+  assert.equal(first.data, stored);
+  assert.equal(second.data, stored);
+  assert.ok(first.data.id.equals(second.data.id));
+  assert.equal(writes, 2);
+  assert.equal(reads, 3);
+});
diff --git a/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.ts b/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.ts
new file mode 100644
index 00000000..4822956c
--- /dev/null
+++ b/modules/onboarding/src/api/application/services/initial-onboarding-provisioner.ts
@@ -0,0 +1,33 @@
+import { isDuplicateEntityError } from "@erp/core/api";
+import type { UniqueID } from "@repo/rdx-ddd";
+import { Result } from "@repo/rdx-utils";
+
+import { InitialOnboarding } from "../../domain";
+import type { IInitialOnboardingRepository } from "../repositories/initial-onboarding-repository.interface";
+
+export class InitialOnboardingProvisioner {
+  public constructor(private readonly repository: IInitialOnboardingRepository) {}
+
+  /** Asegura que existe onboarding; conserva los estados pending y completed existentes. */
+  public async provision(accountId: UniqueID): Promise<Result<InitialOnboarding, Error>> {
+    const current = await this.repository.findByAccountId(accountId);
+    if (current.isFailure) return Result.fail(current.error);
+    if (current.data.isSome()) return Result.ok(current.data.unwrap());
+
+    const created = InitialOnboarding.createPending(accountId);
+    if (created.isFailure) return Result.fail(created.error);
+    const saved = await this.repository.save(created.data);
+    if (saved.isSuccess) return Result.ok(created.data);
+    if (!isDuplicateEntityError(saved.error)) return Result.fail(saved.error);
+
+    // UNIQUE es la garantía entre procesos. Solo recuperamos el ganador confirmado por cuenta.
+    const winner = await this.repository.findByAccountId(accountId);
+    if (winner.isFailure) return Result.fail(winner.error);
+    if (winner.data.isSome()) return Result.ok(winner.data.unwrap());
+    return Result.fail(
+      new Error("Initial onboarding duplicate without a persisted onboarding for the account.", {
+        cause: saved.error,
+      })
+    );
+  }
+}
diff --git a/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.test.ts b/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.test.ts
index 624fd44b..60ee9375 100644
--- a/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.test.ts
+++ b/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.test.ts
@@ -30,6 +30,8 @@ test("creates pending", () => {
   check(r.data.companyId.isNone());
   check(r.data.completedAt.isNone());
   check(r.data.accountId.equals(accountId));
+  check(r.data.createdAt instanceof UtcDateTime);
+  check(r.data.updatedAt.equals(r.data.createdAt));
 });
 test("rehydrates valid states", () => {
   check(InitialOnboarding.rehydrate(props("pending"), UniqueID.generateNewID()).isSuccess);
@@ -64,7 +66,11 @@ test("rejects invalid state combinations", () => {
 test("completes once", () => {
   const o = InitialOnboarding.createPending(UniqueID.generateNewID()).data;
   const id = UniqueID.generateNewID();
-  check(o.complete({ companyId: id, completedAt: date(), updatedAt: date() }).isSuccess);
+  const createdAt = o.createdAt;
+  const updatedAt = UtcDateTime.createFromISO("2026-01-02T11:00:00.456Z").data;
+  check(o.complete({ companyId: id, completedAt: date(), updatedAt }).isSuccess);
+  check(o.createdAt.equals(createdAt));
+  check(o.updatedAt.equals(updatedAt));
   check(o.status === "completed");
   check(o.companyId.unwrap().equals(id));
   check(o.completedAt.isSome());
diff --git a/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.ts b/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.ts
index 714d4080..0303dd0a 100644
--- a/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.ts
+++ b/modules/onboarding/src/api/domain/initial-onboarding/initial-onboarding.aggregate.ts
@@ -1,4 +1,4 @@
-import { AggregateRoot, UniqueID, type UtcDateTime } from "@repo/rdx-ddd";
+import { AggregateRoot, UniqueID, UtcDateTime } from "@repo/rdx-ddd";
 import { Maybe, Result } from "@repo/rdx-utils";
 
 export type InitialOnboardingStatus = "pending" | "completed";
@@ -6,6 +6,8 @@ export interface InitialOnboardingProps {
   accountId: UniqueID;
   status: InitialOnboardingStatus;
   companyId: Maybe<UniqueID>;
+  createdAt: UtcDateTime;
+  updatedAt: UtcDateTime;
   completedAt: Maybe<UtcDateTime>;
 }
 export class InitialOnboarding extends AggregateRoot<InitialOnboardingProps> {
@@ -20,11 +22,14 @@ export class InitialOnboarding extends AggregateRoot<InitialOnboardingProps> {
   }
 
   static createPending(accountId: UniqueID): Result<InitialOnboarding, Error> {
+    const now = UtcDateTime.now();
     return InitialOnboarding.rehydrate(
       {
         accountId,
         status: "pending",
         companyId: Maybe.none(),
+        createdAt: now,
+        updatedAt: now,
         completedAt: Maybe.none(),
       },
       UniqueID.generateNewID()
@@ -61,6 +66,14 @@ export class InitialOnboarding extends AggregateRoot<InitialOnboardingProps> {
     return Result.ok(undefined);
   }
 
+  get createdAt(): UtcDateTime {
+    return this.props.createdAt;
+  }
+
+  get updatedAt(): UtcDateTime {
+    return this.props.updatedAt;
+  }
+
   get accountId() {
     return this.props.accountId;
   }
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/index.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/index.ts
index a7c9624f..f04136fc 100644
--- a/modules/onboarding/src/api/infrastructure/persistence/sequelize/index.ts
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/index.ts
@@ -2,5 +2,6 @@ import initialOnboardingModelInit from "./models/sequelize-initial-onboarding.mo
 
 export * from "./mappers";
 export * from "./models";
+export * from "./repositories";
 
 export const models = [initialOnboardingModelInit];
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.test.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.test.ts
index 14614100..6e33f1ba 100644
--- a/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.test.ts
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.test.ts
@@ -20,6 +20,8 @@ const mapper = new SequelizeInitialOnboardingDomainMapper();
 const id = "11111111-1111-4111-8111-111111111111";
 const accountId = "22222222-2222-4222-8222-222222222222";
 const companyId = "33333333-3333-4333-8333-333333333333";
+const createdAt = "2026-01-01T10:00:00.123Z";
+const updatedAt = "2026-01-02T11:00:00.456Z";
 const completedAt = "2026-01-02T10:30:00.789Z";
 
 function aggregate(status: InitialOnboardingStatus) {
@@ -30,6 +32,8 @@ function aggregate(status: InitialOnboardingStatus) {
       companyId:
         status === "completed" ? Maybe.some(UniqueID.create(companyId).data) : Maybe.none(),
 
+      createdAt: UtcDateTime.createFromISO(createdAt).data,
+      updatedAt: UtcDateTime.createFromISO(updatedAt).data,
       completedAt:
         status === "completed"
           ? Maybe.some(UtcDateTime.createFromISO(completedAt).data)
@@ -48,6 +52,8 @@ function row(patch: Partial<InferAttributes<InitialOnboardingModel>> = {}) {
       account_id: accountId,
       status: "pending",
       company_id: null,
+      created_at: new Date(createdAt),
+      updated_at: new Date(updatedAt),
       completed_at: null,
       ...patch,
     },
@@ -57,13 +63,18 @@ function row(patch: Partial<InferAttributes<InitialOnboardingModel>> = {}) {
 
 for (const status of ["pending", "completed"] as const) {
   test(`toPersistence ${status}`, () => {
-    const result = mapper.mapToPersistence(aggregate(status));
+    const source = aggregate(status);
+    const result = mapper.mapToPersistence(source);
     assert.equal(result.isSuccess, true);
+    assert.deepEqual(result.data.created_at, source.createdAt.toDate());
+    assert.deepEqual(result.data.updated_at, source.updatedAt.toDate());
     assert.deepEqual(result.data, {
       id,
       account_id: accountId,
       status,
       company_id: status === "completed" ? companyId : null,
+      created_at: new Date(createdAt),
+      updated_at: new Date(updatedAt),
       completed_at: status === "completed" ? completedAt : null,
     });
   });
@@ -73,6 +84,8 @@ for (const status of ["pending", "completed"] as const) {
       row({
         status,
         company_id: status === "completed" ? companyId : null,
+        created_at: new Date(createdAt),
+        updated_at: new Date(updatedAt),
         completed_at: status === "completed" ? completedAt : null,
       })
     );
@@ -83,6 +96,8 @@ for (const status of ["pending", "completed"] as const) {
     assert.equal(value.id.toPrimitive(), id);
     assert.equal(value.accountId.toPrimitive(), accountId);
     assert.equal(value.status, status);
+    assert.equal(value.createdAt.toISOString(), createdAt);
+    assert.equal(value.updatedAt.toISOString(), updatedAt);
     assert.equal(value.companyId.isSome(), status === "completed");
     assert.equal(value.completedAt.isSome(), status === "completed");
     if (status === "completed") {
@@ -113,10 +128,14 @@ test("toDomain accepts Sequelize Date timestamps and preserves UTC milliseconds"
     row({
       status: "completed",
       company_id: companyId,
+      created_at: new Date(createdAt),
+      updated_at: new Date(updatedAt),
       completed_at: new Date(completedAt),
     })
   );
   assert.equal(result.isSuccess, true);
+  assert.equal(result.data.createdAt.toISOString(), createdAt);
+  assert.equal(result.data.updatedAt.toISOString(), updatedAt);
   assert.equal(result.data.completedAt.unwrap().toISOString(), completedAt);
 });
 
@@ -133,8 +152,8 @@ test("toDomain propagates invalid identifiers and timestamps as failures", () =>
     { id: "invalid" },
     { account_id: "invalid" },
     { status: "completed", company_id: "invalid", completed_at: completedAt },
-    { created_at: "invalid" },
-    { updated_at: "invalid" },
+    { created_at: new Date(Number.NaN) },
+    { updated_at: new Date(Number.NaN) },
     { status: "completed", company_id: companyId, completed_at: "invalid" },
   ]) {
     assert.equal(mapper.mapToDomain(row(patch)).isFailure, true);
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.ts
index 67edb158..3cc6e191 100644
--- a/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.ts
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/mappers/sequelize-initial-onboarding-domain.mapper.ts
@@ -32,6 +32,10 @@ export class SequelizeInitialOnboardingDomainMapper {
     if (accountId.isFailure) return Result.fail(accountId.error);
     const companyId = maybeFromNullableResult(source.company_id, (value) => UniqueID.create(value));
     if (companyId.isFailure) return Result.fail(companyId.error);
+    const createdAt = toUtcDateTime(source.created_at);
+    if (createdAt.isFailure) return Result.fail(createdAt.error);
+    const updatedAt = toUtcDateTime(source.updated_at);
+    if (updatedAt.isFailure) return Result.fail(updatedAt.error);
     const completedAt = maybeFromNullableResult(source.completed_at, (value) =>
       toUtcDateTime(value)
     );
@@ -42,6 +46,8 @@ export class SequelizeInitialOnboardingDomainMapper {
         accountId: accountId.data,
         status: source.status,
         companyId: companyId.data,
+        createdAt: createdAt.data,
+        updatedAt: updatedAt.data,
         completedAt: completedAt.data,
       },
       id.data
@@ -56,6 +62,8 @@ export class SequelizeInitialOnboardingDomainMapper {
       account_id: source.accountId.toPrimitive(),
       status: source.status,
       company_id: maybeToNullable(source.companyId, (value) => value.toPrimitive()),
+      created_at: source.createdAt.toDate(),
+      updated_at: source.updatedAt.toDate(),
       completed_at: maybeToNullable(source.completedAt, (value) => value.toISOString()),
     });
   }
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.test.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.test.ts
index 83fb3bf0..71714422 100644
--- a/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.test.ts
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.test.ts
@@ -12,7 +12,9 @@ initialOnboardingModelInit(database);
 
 test("model declares table, nullability, UUIDs, timestamps and unique account without cross-module FKs", () => {
   assert.equal(InitialOnboardingModel.getTableName(), "initial_onboardings");
-  assert.equal(InitialOnboardingModel.options.timestamps, false);
+  assert.equal(InitialOnboardingModel.options.timestamps, true);
+  assert.equal(InitialOnboardingModel.options.createdAt, "created_at");
+  assert.equal(InitialOnboardingModel.options.updatedAt, "updated_at");
   const attributes = InitialOnboardingModel.getAttributes();
   assert.deepEqual(Object.keys(attributes).sort(), [
     "account_id",
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.ts
index 3be56a82..90517c58 100644
--- a/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.ts
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/models/sequelize-initial-onboarding.model.ts
@@ -1,4 +1,9 @@
-import type { InferAttributes, InferCreationAttributes, Sequelize } from "sequelize";
+import type {
+  CreationOptional,
+  InferAttributes,
+  InferCreationAttributes,
+  Sequelize,
+} from "sequelize";
 import { DataTypes, Model } from "sequelize";
 
 export type InitialOnboardingCreationAttributes = InferCreationAttributes<InitialOnboardingModel>;
@@ -11,6 +16,8 @@ export class InitialOnboardingModel extends Model<
   declare account_id: string;
   declare status: string;
   declare company_id: string | null;
+  declare created_at: CreationOptional<Date>;
+  declare updated_at: CreationOptional<Date>;
   declare completed_at: Date | string | null;
 }
 
@@ -26,6 +33,8 @@ export default (database: Sequelize) => {
         validate: { isIn: [["pending", "completed"]] },
       },
       company_id: { type: DataTypes.UUID, allowNull: true, defaultValue: null },
+      created_at: { type: DataTypes.DATE, allowNull: false },
+      updated_at: { type: DataTypes.DATE, allowNull: false },
       completed_at: { type: DataTypes.DATE, allowNull: true, defaultValue: null },
     },
     {
@@ -36,6 +45,8 @@ export default (database: Sequelize) => {
       collate: "utf8mb4_unicode_ci",
       underscored: true,
       timestamps: true,
+      createdAt: "created_at",
+      updatedAt: "updated_at",
       indexes: [
         {
           name: "uq_initial_onboardings_account_id",
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/index.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/index.ts
new file mode 100644
index 00000000..957e40ee
--- /dev/null
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/index.ts
@@ -0,0 +1 @@
+export * from "./sequelize-initial-onboarding.repository";
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.test.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.test.ts
new file mode 100644
index 00000000..6a82d8a8
--- /dev/null
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.test.ts
@@ -0,0 +1,169 @@
+import assert from "node:assert/strict";
+import test from "node:test";
+
+import { DuplicateEntityError } from "@erp/core/api";
+import { UniqueID, UtcDateTime } from "@repo/rdx-ddd";
+import { Maybe, Result } from "@repo/rdx-utils";
+import { Sequelize, UniqueConstraintError } from "sequelize";
+
+import { InitialOnboarding } from "../../../../domain";
+import { SequelizeInitialOnboardingDomainMapper } from "../mappers";
+import initialOnboardingModelInit, {
+  InitialOnboardingModel,
+} from "../models/sequelize-initial-onboarding.model";
+
+import { SequelizeInitialOnboardingRepository } from "./sequelize-initial-onboarding.repository";
+
+initialOnboardingModelInit(
+  new Sequelize("mysql://root:pass@localhost:3306/erp_test", { logging: false })
+);
+const mapper = new SequelizeInitialOnboardingDomainMapper();
+const accountId = UniqueID.create("22222222-2222-4222-8222-222222222222").data;
+function aggregate(completed = false) {
+  return InitialOnboarding.rehydrate(
+    {
+      accountId,
+      status: completed ? "completed" : "pending",
+      companyId: completed
+        ? Maybe.some(UniqueID.create("33333333-3333-4333-8333-333333333333").data)
+        : Maybe.none(),
+      createdAt: UtcDateTime.createFromISO("2026-01-01T10:00:00.123Z").data,
+      updatedAt: UtcDateTime.createFromISO("2026-01-02T11:00:00.456Z").data,
+      completedAt: completed
+        ? Maybe.some(UtcDateTime.createFromISO("2026-01-02T10:30:00.789Z").data)
+        : Maybe.none(),
+    },
+    UniqueID.create("11111111-1111-4111-8111-111111111111").data
+  ).data;
+}
+function row(completed = false) {
+  return InitialOnboardingModel.build(mapper.mapToPersistence(aggregate(completed)).data, {
+    raw: true,
+  });
+}
+
+test("find existente usa filtro account_id, mapper y transaction", async (t) => {
+  const transaction = {};
+  const model = row();
+  const find = t.mock.method(InitialOnboardingModel, "findOne", async () => model);
+  const map = t.mock.method(mapper, "mapToDomain");
+  const result = await new SequelizeInitialOnboardingRepository(mapper).findByAccountId(
+    accountId,
+    transaction
+  );
+  assert.equal(result.isSuccess, true);
+  assert.equal(result.data.isSome(), true);
+  assert.equal(result.data.unwrap().id.toPrimitive(), model.id);
+  assert.deepEqual(find.mock.calls[0].arguments[0], {
+    where: { account_id: accountId.toPrimitive() },
+    transaction,
+  });
+  assert.equal(map.mock.calls[0].arguments[0], model);
+});
+
+test("find ausente devuelve Maybe.none sin llamar al mapper", async (t) => {
+  t.mock.method(InitialOnboardingModel, "findOne", async () => null);
+  const map = t.mock.method(mapper, "mapToDomain");
+  const result = await new SequelizeInitialOnboardingRepository(mapper).findByAccountId(accountId);
+  assert.equal(result.isSuccess, true);
+  assert.equal(result.data.isNone(), true);
+  assert.equal(map.mock.callCount(), 0);
+});
+
+for (const completed of [false, true]) {
+  test(`save ${completed ? "completed" : "pending"} crea usando mapper y conserva timestamps y transaction`, async (t) => {
+    const source = aggregate(completed);
+    const expected = mapper.mapToPersistence(source).data;
+    const transaction = {};
+    const find = t.mock.method(InitialOnboardingModel, "findByPk", async () => null);
+    const create = t.mock.method(InitialOnboardingModel, "create", async () => row(completed));
+    const map = t.mock.method(mapper, "mapToPersistence");
+    const result = await new SequelizeInitialOnboardingRepository(mapper).save(source, transaction);
+    assert.equal(result.isSuccess, true);
+    assert.equal(map.mock.calls[0].arguments[0], source);
+    assert.deepEqual(find.mock.calls[0].arguments, [source.id.toPrimitive(), { transaction }]);
+    assert.deepEqual(create.mock.calls[0].arguments, [expected, { transaction, silent: true }]);
+  });
+}
+
+test("save repetido actualiza por id sin volver a insertar", async (t) => {
+  const source = aggregate(true);
+  const transaction = {};
+  let stored: InitialOnboardingModel | null = null;
+  t.mock.method(InitialOnboardingModel, "findByPk", async () => stored);
+  const create = t.mock.method(InitialOnboardingModel, "create", async () => {
+    stored = row(true);
+    return stored;
+  });
+  const update = t.mock.method(InitialOnboardingModel, "update", async () => [1]);
+  const repository = new SequelizeInitialOnboardingRepository();
+  assert.equal((await repository.save(source, transaction)).isSuccess, true);
+  assert.equal((await repository.save(source, transaction)).isSuccess, true);
+  assert.equal(create.mock.callCount(), 1);
+  assert.equal(update.mock.callCount(), 1);
+  const { id, ...values } = mapper.mapToPersistence(source).data;
+  assert.deepEqual(update.mock.calls[0].arguments, [
+    values,
+    { transaction, silent: true, where: { id } },
+  ]);
+});
+
+test("read error retorna Result.fail", async (t) => {
+  const error = new Error("read failed");
+  t.mock.method(InitialOnboardingModel, "findOne", async () => {
+    throw error;
+  });
+  const result = await new SequelizeInitialOnboardingRepository().findByAccountId(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, error);
+});
+
+for (const existing of [false, true]) {
+  test(`write error en ${existing ? "update" : "create"} retorna Result.fail`, async (t) => {
+    const error = new Error("write failed");
+    t.mock.method(InitialOnboardingModel, "findByPk", async () => (existing ? row() : null));
+    t.mock.method(InitialOnboardingModel, existing ? "update" : "create", async () => {
+      throw error;
+    });
+    const result = await new SequelizeInitialOnboardingRepository().save(aggregate());
+    assert.equal(result.isFailure, true);
+    assert.equal(result.error, error);
+  });
+}
+
+test("unique account_id retorna fallo y no reintenta ni relee", async (t) => {
+  const error = new UniqueConstraintError({ message: "duplicate account_id" });
+  const find = t.mock.method(InitialOnboardingModel, "findByPk", async () => null);
+  const reread = t.mock.method(InitialOnboardingModel, "findOne", async () => row());
+  const create = t.mock.method(InitialOnboardingModel, "create", async () => {
+    throw error;
+  });
+  const result = await new SequelizeInitialOnboardingRepository().save(aggregate());
+  assert.equal(result.isFailure, true);
+  assert.ok(result.error instanceof DuplicateEntityError);
+  assert.equal(result.error.cause, error);
+  assert.equal(find.mock.callCount(), 1);
+  assert.equal(create.mock.callCount(), 1);
+  assert.equal(reread.mock.callCount(), 0);
+});
+
+test("fallo de mapper en lectura se propaga", async (t) => {
+  const error = new Error("mapping failed");
+  t.mock.method(InitialOnboardingModel, "findOne", async () => row());
+  t.mock.method(mapper, "mapToDomain", () => Result.fail(error));
+  const result = await new SequelizeInitialOnboardingRepository(mapper).findByAccountId(accountId);
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, error);
+});
+
+test("fallo de mapper en escritura evita consultar o escribir", async (t) => {
+  const error = new Error("mapping failed");
+  t.mock.method(mapper, "mapToPersistence", () => Result.fail(error));
+  const find = t.mock.method(InitialOnboardingModel, "findByPk");
+  const create = t.mock.method(InitialOnboardingModel, "create");
+  const result = await new SequelizeInitialOnboardingRepository(mapper).save(aggregate());
+  assert.equal(result.isFailure, true);
+  assert.equal(result.error, error);
+  assert.equal(find.mock.callCount(), 0);
+  assert.equal(create.mock.callCount(), 0);
+});
diff --git a/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.ts b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.ts
new file mode 100644
index 00000000..8422c179
--- /dev/null
+++ b/modules/onboarding/src/api/infrastructure/persistence/sequelize/repositories/sequelize-initial-onboarding.repository.ts
@@ -0,0 +1,58 @@
+import { translateSequelizeError } from "@erp/core/api";
+import type { UniqueID } from "@repo/rdx-ddd";
+import { Maybe, Result } from "@repo/rdx-utils";
+import type { Transaction } from "sequelize";
+
+import type { IInitialOnboardingRepository } from "../../../../application/repositories/initial-onboarding-repository.interface";
+import type { InitialOnboarding } from "../../../../domain";
+import { SequelizeInitialOnboardingDomainMapper } from "../mappers";
+import { InitialOnboardingModel } from "../models";
+
+export class SequelizeInitialOnboardingRepository implements IInitialOnboardingRepository {
+  public constructor(
+    private readonly domainMapper = new SequelizeInitialOnboardingDomainMapper()
+  ) {}
+
+  public async findByAccountId(
+    accountId: UniqueID,
+    transaction?: unknown
+  ): Promise<Result<Maybe<InitialOnboarding>, Error>> {
+    try {
+      const row = await InitialOnboardingModel.findOne({
+        where: { account_id: accountId.toPrimitive() },
+        transaction: transaction as Transaction | undefined,
+      });
+      if (!row) return Result.ok(Maybe.none<InitialOnboarding>());
+      return this.domainMapper.mapToDomain(row).map((value) => Maybe.some(value));
+    } catch (error: unknown) {
+      return Result.fail(translateSequelizeError(error));
+    }
+  }
+
+  public async save(
+    initialOnboarding: InitialOnboarding,
+    transaction?: unknown
+  ): Promise<Result<void, Error>> {
+    try {
+      const persistence = this.domainMapper.mapToPersistence(initialOnboarding);
+      if (persistence.isFailure) return Result.fail(persistence.error);
+
+      const sqlTransaction = transaction as Transaction | undefined;
+      const { id, ...values } = persistence.data;
+      // Comprobar por id evita que un upsert MySQL absorba una colisión de account_id.
+      const existing = await InitialOnboardingModel.findByPk(id, {
+        transaction: sqlTransaction,
+      });
+      // El agregado proporciona los timestamps; Sequelize no debe reemplazar updated_at.
+      const options = { transaction: sqlTransaction, silent: true };
+      if (existing) {
+        await InitialOnboardingModel.update(values, { ...options, where: { id } });
+      } else {
+        await InitialOnboardingModel.create(persistence.data, options);
+      }
+      return Result.ok();
+    } catch (error: unknown) {
+      return Result.fail(translateSequelizeError(error));
+    }
+  }
+}