Engineering Journal•2026-06-19

Building CF Live in Go

How I built a real-time Codeforces analytics platform.

Building CF Live in Go

CF Live started as an experiment to learn Go.

Why?

I wanted to:

Learn Go
Learn PostgreSQL
Build something useful

Architecture

Go Backend
PostgreSQL
Next.js Frontend
WebSockets

Biggest Challenge

Handling duplicate submissions.

After multiple iterations, I implemented a deduplication mechanism.

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