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Deep dives into real-time system design, database performance, learning mechanics, and platform updates.

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Building Real-Time 1v1 Code Battle Arenas with WebSockets & Judge0
Engineering
6 min read•Aug 28, 2026

Building Real-Time 1v1 Code Battle Arenas with WebSockets & Judge0

An inside look at how CosmoDex synchronizes code state, executes multi-language submissions in sandboxed containers, and broadcasts live opponent progress in under 50ms.

Shubham gharte

Shubham gharte

Lead Architect & Founder

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Mastering SQL Window Functions & Query Performance in CosmoDex
Tutorials
5 min read•Aug 25, 2026

Mastering SQL Window Functions & Query Performance in CosmoDex

Unlock the power of ROW_NUMBER(), RANK(), DENSE_RANK(), and window partitioning to solve complex database challenges in record time.

Elena Rostova
Elena Rostova
How Gamification Increases Student Coding Retention by 300%
Product
4 min read•Aug 20, 2026

How Gamification Increases Student Coding Retention by 300%

Exploring the cognitive psychology behind daily streaks, XP progression, cosmic rank badges, and micro-rewards in developer education.

Alex Rivera
Alex Rivera
CosmoDex 2.0: Introducing AI-Powered Code Diagnostics & Leagues
News
3 min read•Aug 15, 2026

CosmoDex 2.0: Introducing AI-Powered Code Diagnostics & Leagues

Announcing our largest update ever featuring real-time AI error explanations, animated mascot guidance, and seasonal competitive leagues.

CosmoDex Team
CosmoDex Team
Cosmo Mascot
Left Eye
Right Eye