diff --git a/packages/core-shared/src/jobs/in-memory-job-queue.test.ts b/packages/core-shared/src/jobs/in-memory-job-queue.test.ts
new file mode 100644
index 0000000..6bae943
--- /dev/null
+++ b/packages/core-shared/src/jobs/in-memory-job-queue.test.ts
@@ -0,0 +1,54 @@
+import { describe, it, expect, vi } from "vitest";
+import { InMemoryJobQueue } from "@/jobs/in-memory-job-queue";
+import type { IJobQueue } from "@/jobs/job-queue.interface";
+
+describe("InMemoryJobQueue", () => {
+  it("returns a synthetic jobId on enqueue", async () => {
+    const handler = vi.fn();
+    const queue: IJobQueue = new InMemoryJobQueue({
+      "test.task": handler,
+    });
+    const result = await queue.enqueue("test.task", { x: 1 });
+    expect(result.jobId).toMatch(/^in-memory-/);
+  });
+
+  it("invokes the registered handler asynchronously with the input", async () => {
+    const handler = vi.fn();
+    const queue = new InMemoryJobQueue({ "test.task": handler });
+    await queue.enqueue("test.task", { x: 42 });
+    await new Promise((r) => setImmediate(r));
+    expect(handler).toHaveBeenCalledWith({ x: 42 });
+  });
+
+  it("throws if the task slug has no registered handler", async () => {
+    const queue = new InMemoryJobQueue({});
+    await expect(queue.enqueue("missing.task", {})).rejects.toThrow(
+      /no handler registered for task slug: missing\.task/,
+    );
+  });
+
+  it("delays execution when runAt is in the future", async () => {
+    vi.useFakeTimers();
+    try {
+      const handler = vi.fn();
+      const queue = new InMemoryJobQueue({ "test.task": handler });
+      const future = new Date(Date.now() + 1000);
+      await queue.enqueue("test.task", {}, { runAt: future });
+      expect(handler).not.toHaveBeenCalled();
+      vi.advanceTimersByTime(1000);
+      await Promise.resolve();
+      expect(handler).toHaveBeenCalledTimes(1);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
+  it("register adds a handler that can be enqueued against", async () => {
+    const queue = new InMemoryJobQueue();
+    const handler = vi.fn();
+    queue.register("late.task", handler);
+    await queue.enqueue("late.task", { z: 1 });
+    await new Promise((r) => setImmediate(r));
+    expect(handler).toHaveBeenCalledWith({ z: 1 });
+  });
+});
diff --git a/packages/core-shared/src/jobs/in-memory-job-queue.ts b/packages/core-shared/src/jobs/in-memory-job-queue.ts
new file mode 100644
index 0000000..0328402
--- /dev/null
+++ b/packages/core-shared/src/jobs/in-memory-job-queue.ts
@@ -0,0 +1,36 @@
+import type { IJobQueue } from "./job-queue.interface";
+
+export type InMemoryHandler = (input: unknown) => Promise<void> | void;
+
+export class InMemoryJobQueue implements IJobQueue {
+  private counter = 0;
+  private readonly handlers: Record<string, InMemoryHandler>;
+
+  constructor(handlers: Record<string, InMemoryHandler> = {}) {
+    this.handlers = { ...handlers };
+  }
+
+  register(slug: string, handler: InMemoryHandler): void {
+    this.handlers[slug] = handler;
+  }
+
+  async enqueue<T>(
+    taskSlug: string,
+    input: T,
+    options?: { runAt?: Date },
+  ): Promise<{ jobId: string }> {
+    const handler = this.handlers[taskSlug];
+    if (!handler) {
+      throw new Error(`no handler registered for task slug: ${taskSlug}`);
+    }
+    this.counter += 1;
+    const jobId = `in-memory-${this.counter}`;
+    const delay = options?.runAt ? options.runAt.getTime() - Date.now() : 0;
+    if (delay > 0) {
+      setTimeout(() => void handler(input), delay);
+    } else {
+      setImmediate(() => void handler(input));
+    }
+    return { jobId };
+  }
+}