Simon Willison • 4/24/2026

Serving the For You feed

This article explores the architecture behind Bluesky's custom 'For You' feed, run by a developer known as spacecowboy. The feed serves 72,000 users using a single Go process with SQLite on a gaming PC in his living room. Recommendations are based on likes, consuming the Bluesky firehose and storing 90 days of data (419GB). Public traffic routes through a $7/month VPS via Tailscale. Total cost is $30/month, and the system could theoretically scale to all 1 million daily active Bluesky users.

0 comments

#bluesky #sqlite #go