Shayon’s writing https://shayon.work/blog Writing by Shayon, a software engineer in Berlin. en My gym forced a social media down my throat. I reverse-engineered its app. https://shayon.work/blog/reverse-engineering-gym-pass https://shayon.work/blog/reverse-engineering-gym-pass Wed, 04 Nov 2026 00:00:00 GMT Extracting my gym’s QR check-in from its Flutter app, with a rooted phone and a lot of ripgrep.