Writing on tools, interfaces, systems, and process.https://mumink.com/https://mumink.com/notes/getting-started-with-fastspring/https://mumink.com/notes/getting-started-with-fastspring/Connecting FastSpring to your product so purchases grant access — and renewals, lapses, and cancellations keep it in sync.Fri, 26 Jun 2026 00:00:00 GMThttps://mumink.com/notes/paddle-subscription-webhooks/https://mumink.com/notes/paddle-subscription-webhooks/Keeping an internal entitlements system in sync with Paddle — and the undocumented edge cases that bite in production.Mon, 15 Jun 2026 00:00:00 GMThttps://mumink.com/notes/self-healing-cache-stampede/https://mumink.com/notes/self-healing-cache-stampede/A cached null in Redis, a silent TTL change, and millions of queued jobs.Tue, 02 Jun 2026 00:00:00 GMThttps://mumink.com/notes/license-activation-concurrency/https://mumink.com/notes/license-activation-concurrency/Making a hot, correctness-critical endpoint fast under load — by changing what we locked and how.Tue, 26 May 2026 00:00:00 GMThttps://mumink.com/notes/why-web-apps-hate-printers/https://mumink.com/notes/why-web-apps-hate-printers/A simple print task that turned into a deep dive on CSS pagination — and how different LLMs reason.Sun, 17 May 2026 00:00:00 GMT