Ship That Code — Build Real Systems, Not Tutorials

Learn by building and shippingreal systems.Pick a system. Build it from scratch. Every lesson is choose → write → run, until it clicks.80+ build-from-scratch courses · 9 languages · no credit cardExplore all 80+ coursesFollow a career pathSequenced courses that take you from zero to job-ready.All pathsBackend Engineerintermediate~80hThe infrastructure under every web service — Go, SQL, caches, queues, and the protocols that connect them.Go FundamentalsSQL FundamentalsBuild Redis+5 moreFrontend Engineerintermediate~65hMaster the browser end of the wire — JavaScript, TypeScript, then build the framework you depend on every day.JavaScript FundamentalsTypeScript FundamentalsJavaScript Advanced+4 moreFull-Stack Developerintermediate~90hBoth ends of the wire: TypeScript on the client, plus a backend language and the protocols that connect them.JavaScript FundamentalsTypeScript FundamentalsSQL Fundamentals+4 moreDevOps / SREintermediate~70hRun the systems other engineers build — Bash and Go for tooling; Docker, CI, and observability for the platform.Bash FundamentalsGo FundamentalsBuild Docker+4 moreData Scientistbeginner~60hPython, R, and SQL — the canonical trio of data analysis. Plus the data structures behind efficient queries.Python FundamentalsPython in PracticeR Fundamentals+4 moreSee all 14 career pathsLearn programming languagesEach card opens a structured Fundamentals → Intermediate → Advanced track. Tap the > chevron to reveal all 37 languages.“You can’t cheat — you either solve the problem or you don’t. It’s the first platform where I actually understand what I’m writing.”Your first lesson takes 2 minutesCreate free accountFree forever. No credit card. Takes 30 seconds.