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Someone shipped a bug.Find it, fix it, turn the tests green.

Challenges / Orders API charges twice

Run tests
1import { Router } from "express";
2import { charge } from "../payments.js";
3import { db } from "../db.js";
4
5export const ordersRouter = Router();
6
7ordersRouter.post("/", async (req, res) => {
8 const { cartId, total } = req.body;
9 const payment = await charge(cartId, total);
10
11 const existing = await db.orders.findByCart(cartId);
12 if (existing) return res.status(200).json(existing);
13
14 const order = await db.orders.create({ cartId, total, payment });
15 res.status(201).json(order);
16});

How it works

Work the way the job works now.Read the code, steer the AI, prove it with tests.

  1. 01 · Find

    Where does it break?

    Open a real Node.js or React project with an editor, terminal and live preview. Ask the AI to walk you through unfamiliar code, then trace the failing tests to the cause.

  2. 02 · Fix

    Can you steer the AI, not just follow it?

    The assistant explains code and failing assertions, but the fix stays yours. Asking sharp questions and checking the answers is exactly what interviewers grade. Stuck? Unlock a hint.

  3. 03 · Pass

    Does the whole suite go green?

    AI output is only as good as its proof. Run the tests as often as you like; a challenge is solved when every required test passes.

Tracks

Backend, frontend or both.Practise on the stack your interview uses.

  • Node.js · Express

    Backend

    APIs with broken routing, validation, async error handling and data access.

  • React

    Frontend

    Apps with stale state, runaway effects, broken forms and rendering bugs.

  • Node.js · React

    Full-stack

    Both in one repository, with bugs that cross the API boundary.

Easy ~20 min · Medium ~45 min · Hard ~90 min

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