Early engineer (3rd hire) at a high-growth multiplayer sandbox game, helping scale to 15M+ monthly active users and 20k+ concurrent players. Principal engineer for production backend infrastructure including DNS, Cloudflare, Nginx, and large-scale server automation for a 1,000+ server fleet. Designed custom analytics infrastructure using HyperLogLog for DAU/WAU/MAU tracking, architected distributed real-time social systems (friends, parties), and owned frontend UI architecture. Shipped releases across Android, iOS, Microsoft Store, and web platforms, while also owning the ads and monetisation system (adding £60k+ monthly revenue).