Competitive codingwith some grit.
CodeArena is built for real practice. Battle other coders 1v1, solve company interview problems, or grind competitive programming — all with proper judging and your own ELO rating.
Match Format
1v1 Real-time Battles
Practice Tracks
Company DSA + Competitive
Code Execution
Docker-isolated Judging
Progress
ELO Rating + Match History
Forge your reputation
Everything you need to level up.
1v1 matchmaking
Head-to-head battles in real time.
Queue up and get matched with a real opponent. Both of you solve the same problem under a shared timer. Your code runs against hidden tests — the faster and better solution wins.
Rating system
ELO that tracks your real skill.
Every match updates your ELO rating. Win and it goes up. Lose and it drops. No shortcuts — your rating shows how you actually perform against real opponents.
Company-wise DSA
Practice problems asked by real companies.
Pick a company — Google, Amazon, Microsoft, Meta, and more. Solve their most commonly asked interview problems with a proper code editor, hidden test cases, and AI feedback after every submission to help you understand what went right or wrong.
Competitive programming
Codeforces-style practice with ratings.
Write full solutions with raw stdin and stdout. Problems are sorted by difficulty rating from 800 to 2000+, just like a competitive programming ladder.
Secure execution
Every submission runs in isolation.
Your code runs inside Docker containers with hidden test cases. Both practice and battle submissions are judged by real execution — not mocked responses.
Ready to enter the arena?
Battle other coders, practice interview problems, grind competitive programming, and track your progress with a real rating. No fluff. Just code and compete.