Simon Willison • 4/24/2026

Serving the For You feed

This article details the architecture behind Bluesky's custom 'For You' feed, served by a single Go process running SQLite on a gaming PC in a living room. It explains how recommendations are based on likes, how the server consumes the Bluesky firehose and stores 90 days of data (419GB), and how public traffic is routed via a cheap VPS and Tailscale. The total cost is $30/month, and the system could theoretically scale to all daily active Bluesky users.

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#at protocol #sqlite #go