Relearn the stack you actually ship with
Full-stack TypeScript, Go, AI agents, infrastructure, and Web3 in short hands-on lessons. Every one ends with real code you run in the browser, and the first lesson of every course is free.
35 courses · 170 runnable lessons · 6 tracks
A live sandbox, right here on the landing page. Edit the code and press Run.
Runnable challenges
Real, editable code in every lesson, in an in-browser sandbox. No setup, no install. Web3 lessons even read Ethereum mainnet live.
Tracks, not a pile of videos
Six ordered paths from junior to senior. Finish a course and the next one is already queued, with a share card for your network.
Progress that sticks
A free account unlocks every lesson, and your completed lessons sync live across every device so you can pick up where you left off.
Pick a track
Ordered paths through the catalog. Each starts with a free lesson.
7 courses · 30 lessons
Full-Stack TypeScript
From the language up to a shipped Next.js + Convex app with a real CMS behind it.
JavaScript, Refreshed → TypeScript Deep Dive → Modern React, Refreshed (2021 → Now) → Next.js App Router Foundations → Building Real Apps with Next.js 16 & Convex → Production Convex Patterns → Sanity CMS in Production
Start track6 courses · 30 lessons
Backend & Go
Node and Postgres foundations, then Go from syntax to a single-binary full-stack service.
Node.js Fundamentals → PostgreSQL Fundamentals → Go for TypeScript Developers → Shipping Go: From Source to Service → Full-Stack Go + React → Go + HTMX: Hypermedia Apps
Start track4 courses · 23 lessons
AI Engineering
Agents, retrieval, evals, and running your own inference network.
Building AI Agents with the Claude API → Vector Search & RAG Engineering → LLM Evals & Agent Reliability → Building an AI Inference Network
Start track4 courses · 20 lessons
Infrastructure & Edge
Containers, orchestration, infrastructure as code, and compute at the edge.
Docker Fundamentals → Kubernetes Fundamentals → Terraform & Infrastructure as Code → Cloudflare Workers & the Edge
Start track3 courses · 15 lessons
Web3: Junior to Senior
Read the chain, write the contracts that own state, ship a dApp that won't become a headline.
Web3 Fundamentals: Chains, Keys & Wallets → Smart Contracts with Solidity: CRUD On-Chain → Production dApps: Security, Architecture & the Frontier
Start track3 courses · 15 lessons
Computer Science, Refreshed
The algorithms, patterns, and system design trade-offs that senior interviews actually grade.
Data Structures & Algorithms → Design Patterns for Modern TypeScript → System Design & Distributed Systems
Start track