Build a Claude Code Verification Harness

Oct 8, Reserve a seat
Free to read

Make the modern frontend stack make sense

From raw DOM to a Next.js app you actually understand, in the order the layers were meant to be learned.

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Taught by an engineer who has shipped this

  • ISO 27001

    Led the engineering work behind the certification of a regulated EU platform.

  • Series A platform

    Architected the case-management product that became the business a €11.6M round was raised on.

  • 3x faster deploys

    Cut time-to-deploy by migrating to Kubernetes on GCP with deploy-on-merge.

Make the modern frontend stack finally make sense. Start in the DOM with raw HTML, CSS, and fetch. Build up to React, then to a real Next.js app with Server Components, Server Actions, optimistic UI, auth, tests, Docker, and websockets. Every layer connects to the next.

Make the modern frontend stack finally make sense. From raw DOM to a Fullstack app you actually understand.

What you'll ship

Real projects, not toy demos.

  • A list-and-detail UI built with raw DOM and fetch
  • A responsive layout with native CSS Grid and Flexbox
  • A token-based login flow against a real backend
  • A React app with components, hooks, custom hooks, and Tailwind
  • A Next.js app with Server Components, Server Actions, and streaming
  • A real-time UI that updates over a websocket
  • A full-stack docker compose with Next.js, Postgres, and Redis
  • A frontend you can defend in any architecture review

What you'll learn

You finish able to:

  • Manipulate the DOM directly so React stops feeling like magic
  • Build responsive layouts with native CSS Grid and Flexbox
  • Use fetch, async, and error states the way real apps do
  • Write React with hooks, context, and custom hooks
  • Use the Next.js App Router with Server Components and Server Actions
  • Stream UI with Suspense and ship optimistic updates that feel instant
  • Test, containerize, and ship a full-stack Next.js app with Vitest, Playwright, and Docker

Curriculum

From first principles to a deployed Next.js app.

  1. 01

    DOM and data

    Manipulate the DOM by hand and fetch JSON the old-fashioned way, so React stops feeling like magic later.

  2. 02

    Client-server sync

    Handle loading, errors, and race conditions so your UI never lies about what is happening.

  3. 03

    Native CSS layout

    Real responsive layout with Grid and Flexbox. No frameworks, no guessing.

  4. 04

    Stateless auth on the web

    Tokens, Authorization headers, and the tradeoffs every frontend has to make.

  5. 05

    React and Tailwind foundations

    Components, hooks, and utility-first CSS that let you ship a real UI without leaving your editor.

  6. 06

    React routing and state

    Client-side routing, global state with Context, and custom hooks that keep components clean.

  7. 07

    Next.js Server rendering

    The App Router, Server Components, and the part where React finally moves to the server.

  8. 08

    Next.js Server Actions

    Mutate data without writing an API route, and without leaving the component file.

  9. 09

    Optimistic UI and streaming

    Make your app feel instant with Suspense, streaming, and useOptimistic.

  10. 10

    Frontend deployment

    Ship the whole thing in one command. Docker, multi-stage builds, and a full-stack compose.

  11. 11

    Frontend testing

    Vitest, Testing Library, and Playwright. The three tools every React team uses.

  12. 12

    Forms and validation

    React Hook Form plus Zod. The same schema on the frontend and the backend.

  13. 13

    Realtime UI over WebSockets

    Subscribe to rooms, handle reconnection, and update your UI live.

Who it's for

Is this for you?

Backend engineers

who can ship an API but freeze the moment they have to render it

Self-taught developers

who learned React from blog posts and never quite understood Next.js

Bootcamp grads

who only ever touched Create React App and feel left behind

Engineers chasing the App Router

who keep getting Server Components, Server Actions, and streaming confused

FAQ

Common questions.

  • Do I need React experience?

    No. The early modules use plain HTML, CSS, and JavaScript so you understand what React abstracts away. React enters once you have the foundations, and Next.js comes after that.

  • Why Next.js and the App Router?

    Because that is where modern React lives now. Server Components, Server Actions, and streaming are not optional anymore. You learn them in context, not as buzzwords from a blog post.

  • Does this connect to a real backend?

    Yes. The auth, server actions, and websocket modules call the same shape of backend the Backend Masterclass teaches you to build. The two are designed to fit together.

  • Is this self-paced?

    Yes. Self-paced, included with your Pro subscription. Replay any module, any time.