intermediate

AI-Assisted Full-Stack Next.js Task Manager with Codex

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Learn to build with Codex as your dev partner: scaffold a Next.js app, create API routes, and ship a full task manager with CRUD, filtering, and validation. Iterate on backend and frontend—from services to UI with optimistic updates—and finish with a polished, production-ready app.

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Build your foundation with Codex in a clean Next.js project. Learn to guide Codex safely, inspect project structure, and generate small utilities. Scaffold the app’s core layout, API routes, and folders so the task manager has a clear, extensible structure before adding real logic.

Course 2

AI-Assisted Backend Development: Task Manager API

4 lessons

12 practices

Implement the full Task Manager backend with Codex. Design the task model, build a service layer, and create CRUD API routes with validation, filtering, and structured responses. Add middleware, logging, and API protection to produce a realistic, testable backend.

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Course 3

Backend Architecture & Production Readiness

3 lessons

9 practices

Refactor the backend for production-style reliability. Replace manual validation with Zod, standardize responses, and introduce a repository pattern. Add in-memory and file-based persistence, enabling flexible data storage while keeping the API stable and predictable.

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Course 4

AI-Assisted Frontend Development: Task Manager UI Foundations

3 lessons

9 practices

Build a structured, data-driven UI on top of the completed backend. Create a dashboard layout, reusable components, and task lists with loading and error states. Add filtering, navigation, and toast feedback to establish a solid frontend foundation without full CRUD yet.

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Course 5

Frontend CRUD Workflows & UX Refinement

3 lessons

9 practices

Complete the app with full CRUD workflows and polished UX. Implement forms, API client logic, create/edit/delete flows, and optimistic updates. Add confirmation modals, global loading/error handling, and refine interactions so the app feels fast, consistent, and production-ready.

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Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

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+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

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Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

From our community

Hear what our customers have to say about CodeSignal Learn

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

I love that it's personalized. When I'm stuck, I don't have to hope my Google searches come out successful. The AI mentor Cosmo knows exactly what I need.

Faith Yim

Software Engineer

+14

It's an amazing product and exceeded my expectations, helping me prepare for my job interviews. Hands-on learning requires you to actually know what you are doing.

Alex Bush

Full Stack Engineer

I'm really impressed by the AI tutor Cosmo's feedback about my code. It's honestly kind of insane to me that it's so targeted and specific.

Abbey Helterbran

Tech consultant

I tried Leetcode but it was too disorganized. CodeSignal covers all the topics I'm interested in and is way more structured.

Jonathan Miller

Senior Machine Learning Engineer

+12

I'm impressed by the quality and can't stop recommending it. It's also a lot of fun!

Francisco Aguilar Meléndez

Data Scientist

+11

AI-Assisted Full-Stack Next.js Task Manager with Codex

Trusted by learners working at top companies

Turn screen time into skills time

Join the 1M+ learners on CodeSignal

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