Building useful things, one system at a time.

Building high-performance systems and open-source tools. Currently focused on distributed systems and developer experience.

Read the blog

Recent blog

View all posts

Go Backend

Build a Rate Limiter in Go — Part 4: Redis-Backed Distributed Rate Limiting

Mar 17, 2026 10 min read

In-memory rate limiters break the moment you scale horizontally. In Part 4 we move state into Redis, introduce a Store interface for flexibility, and implement both sliding window and token bucket algorithms that work correctly across multiple instances.

Go Backend

Build a Rate Limiter in Go — Part 3: The Token Bucket Algorithm

Mar 15, 2026 7 min read

The sliding window isn't the only way to rate limit. In Part 3 we implement the token bucket algorithm — a different mental model that handles bursts more gracefully.

Go Backend

Build a Rate Limiter in Go — Part 2: Scaling with Map Sharding

Mar 14, 2026 7 min read

In Part 1 we built a correct sliding window rate limiter. In Part 2 we fix its biggest weakness — a global lock that blocks real traffic during cleanup at scale.