Solo coding practice gets stale. I wanted something with real stakes — a platform where two developers compete live on the same problem, under the same clock. That's Dev-Battle . How a match works Create or join a lobby Problem is broadcast to both players Write and submit your code Sandboxed runner judges the output AI feedback is shown in the arena XP and leaderboard rankings update live Features Real-time rooms — synchronized match state via WebSockets, low-latency updates Sandboxed execution — isolated runners for safe, reproducible judging AI feedback — hints and notes without giving away the answer Progression system — XP, achievements, and a global leaderboard Monorepo architecture — shared types and codegen keep client and server in sync Stack Layer Tech Frontend React + Vite + TypeScript Backend Node.js + WebSockets + REST Execution Sandboxed container runner Database SQL + Drizzle ORM AI layer Optional AI microservice Tooling pnpm monorepo + OpenAPI codegen What's next Spectator mode, tournament…