Go · backend track · graded under -race

Learn Go like a backend engineer.Real tests. Race detector on. No videos.

Three courses that take a working programmer from Go idioms to gRPC and pprof. Every exercise is graded by real Go tests — concurrency under the race detector — so “it works” is never a vibe. Built for people who already program.

Start the Go track — freesee the track ↓
go-1 · fan-in · concurrencygo test -race
// merge fans results from n workers into one channel.
// The grader runs this under -race — a data race is a failing test.
func merge(chs ...<-chan int) <-chan int {
	out := make(chan int)
	var wg sync.WaitGroup
	for _, ch := range chs {
		wg.Add(1)
		go func() {
			defer wg.Done()
			for v := range ch {
				out <- v
			}
		}()
	}
	go func() {
		wg.Wait()
		close(out)
	}()
	return out
}
--- PASS: TestMerge (0.00s) · race detector clean · ok
GO 1

Fundamentals & Concurrency

Go for people who already program — idioms, slices, maps and structs, errors and interfaces, and correct concurrency graded under -race.

GO 2

HTTP, Data & Testing

Production HTTP services on net/http, data access via repository interfaces, and Go-team testing — table-driven, httptest, benchmarks.

GO 3

gRPC, Performance & Deploy

The production tier — gRPC service design, pprof-driven performance, tiny-container deployment, and a load balancer and KV-store capstone.

01

The tests decide, not vibes

Your code runs against real Go tests with the race detector on. Pass/fail is deterministic — the AI never grades you.

02

It adapts to you

Struggle on a concept and the game diagnoses why and builds targeted practice. Already know channels? It moves you up instead of making you sit through it.

03

Ship real backends

Capstones like a load balancer and a KV store, with a senior-engineer code review — the answer to tutorial hell. Ship a portfolio, not just streaks.

Your first passing Go test is minutes away.

Start the Go track — free

Free tier is genuinely free — every banked exercise is playable. We gate AI help and fresh generation, never the content.