6 years building Planning Poker Online: from a weekend project to 147K users (and 3 mistakes I had to fix)

In early 2020 I built a real-time planning poker app over a weekend, almost by accident. Six years later, 147,000+ people use it every month, including teams at Google. This is a story about Firebase, Hacker News, a €60k mistake, and what I'd do differently if I started today. Especially relevant if you're building a SaaS in 2026 and worried about LLM-era discovery. The 2020 origin In 2019 I was working as a frontend developer in a distributed team. At the start of every sprint we would always d