diff --git a/packages/core/src/infrastructure/repositories/mock-articles.repository.ts b/packages/core/src/infrastructure/repositories/mock-articles.repository.ts
new file mode 100644
index 0000000..8ed6800
--- /dev/null
+++ b/packages/core/src/infrastructure/repositories/mock-articles.repository.ts
@@ -0,0 +1,46 @@
+import { injectable } from "inversify";
+
+import type { IArticlesRepository } from "@/application/repositories/articles.repository.interface.js";
+import type { Article } from "@/entities/models/article.js";
+
+@injectable()
+export class MockArticlesRepository implements IArticlesRepository {
+  private _articles: Article[] = [];
+
+  async getArticle(id: string): Promise<Article | undefined> {
+    return this._articles.find((a) => a.id === id);
+  }
+
+  async getArticles(options?: {
+    status?: string;
+    authorId?: string;
+    limit?: number;
+    offset?: number;
+  }): Promise<Article[]> {
+    let result = [...this._articles];
+    if (options?.status) {
+      result = result.filter((a) => a.status === options.status);
+    }
+    if (options?.authorId) {
+      result = result.filter((a) => a.authorId === options.authorId);
+    }
+    const offset = options?.offset ?? 0;
+    const limit = options?.limit ?? 50;
+    return result.slice(offset, offset + limit);
+  }
+
+  async createArticle(input: Article): Promise<Article> {
+    this._articles.push(input);
+    return input;
+  }
+
+  async updateArticle(
+    id: string,
+    input: Partial<Article>
+  ): Promise<Article | undefined> {
+    const index = this._articles.findIndex((a) => a.id === id);
+    if (index === -1) return undefined;
+    this._articles[index] = { ...this._articles[index]!, ...input };
+    return this._articles[index];
+  }
+}
diff --git a/packages/core/src/infrastructure/repositories/mock-users.repository.ts b/packages/core/src/infrastructure/repositories/mock-users.repository.ts
new file mode 100644
index 0000000..968f838
--- /dev/null
+++ b/packages/core/src/infrastructure/repositories/mock-users.repository.ts
@@ -0,0 +1,25 @@
+import { injectable } from "inversify";
+
+import type { IUsersRepository } from "@/application/repositories/users.repository.interface.js";
+import type { User } from "@/entities/models/user.js";
+
+@injectable()
+export class MockUsersRepository implements IUsersRepository {
+  private _users: User[] = [
+    { id: "1", username: "alice", passwordHash: "hashed_password_alice" },
+    { id: "2", username: "bob", passwordHash: "hashed_password_bob" },
+  ];
+
+  async getUser(id: string): Promise<User | undefined> {
+    return this._users.find((u) => u.id === id);
+  }
+
+  async getUserByUsername(username: string): Promise<User | undefined> {
+    return this._users.find((u) => u.username === username);
+  }
+
+  async createUser(input: User): Promise<User> {
+    this._users.push(input);
+    return input;
+  }
+}
diff --git a/packages/core/src/infrastructure/services/mock-auth.service.ts b/packages/core/src/infrastructure/services/mock-auth.service.ts
new file mode 100644
index 0000000..9999b55
--- /dev/null
+++ b/packages/core/src/infrastructure/services/mock-auth.service.ts
@@ -0,0 +1,72 @@
+import { inject, injectable } from "inversify";
+
+import type { IAuthenticationService } from "@/application/services/auth.service.interface.js";
+import type { IUsersRepository } from "@/application/repositories/users.repository.interface.js";
+import { UnauthenticatedError } from "@/entities/errors/auth.js";
+import { sessionSchema, type Session } from "@/entities/models/session.js";
+import type { Cookie } from "@/entities/models/cookie.js";
+import type { User } from "@/entities/models/user.js";
+import { DI_SYMBOLS } from "@/di/types.js";
+import { SESSION_COOKIE } from "@/config.js";
+
+@injectable()
+export class MockAuthenticationService implements IAuthenticationService {
+  private _sessions: Record<string, { session: Session; user: User }> = {};
+
+  constructor(
+    @inject(DI_SYMBOLS.IUsersRepository)
+    private _usersRepository: IUsersRepository
+  ) {}
+
+  generateUserId(): string {
+    return (Math.random() + 1).toString(36).substring(7);
+  }
+
+  async hashPassword(password: string): Promise<string> {
+    return `hashed_${password}`;
+  }
+
+  async verifyPassword(hash: string, password: string): Promise<boolean> {
+    return hash === `hashed_${password}`;
+  }
+
+  async validateSession(
+    sessionId: string
+  ): Promise<{ user: User; session: Session }> {
+    const result = this._sessions[sessionId];
+    if (!result) {
+      throw new UnauthenticatedError("Unauthenticated");
+    }
+    const user = await this._usersRepository.getUser(result.user.id);
+    if (!user) {
+      throw new UnauthenticatedError("Unauthenticated");
+    }
+    return { user, session: result.session };
+  }
+
+  async createSession(
+    user: User
+  ): Promise<{ session: Session; cookie: Cookie }> {
+    const session = sessionSchema.parse({
+      id: "session_" + user.id,
+      userId: user.id,
+      expiresAt: new Date(Date.now() + 86400000 * 7),
+    });
+    const cookie: Cookie = {
+      name: SESSION_COOKIE,
+      value: session.id,
+      attributes: {},
+    };
+    this._sessions[session.id] = { session, user };
+    return { session, cookie };
+  }
+
+  async invalidateSession(
+    sessionId: string
+  ): Promise<{ blankCookie: Cookie }> {
+    delete this._sessions[sessionId];
+    return {
+      blankCookie: { name: SESSION_COOKIE, value: "", attributes: {} },
+    };
+  }
+}
diff --git a/packages/core/src/infrastructure/services/mock-telemetry.service.ts b/packages/core/src/infrastructure/services/mock-telemetry.service.ts
new file mode 100644
index 0000000..5b6e1c1
--- /dev/null
+++ b/packages/core/src/infrastructure/services/mock-telemetry.service.ts
@@ -0,0 +1,10 @@
+import { injectable } from "inversify";
+
+import type { ITelemetryService } from "@/application/services/telemetry.service.interface.js";
+
+@injectable()
+export class MockTelemetryService implements ITelemetryService {
+  async startSpan<T>(_name: string, fn: () => T | Promise<T>): Promise<T> {
+    return fn();
+  }
+}