7 posts
Every client:load directive you add ships JavaScript to every reader. Most of them do not need it. The difference between Lighthouse 100 and 85 is understanding which components need interactivity and choosing the right hydration strategy for each.
14 min readYour Astro site builds locally but fails on deploy — Mermaid needs Playwright, edge functions reference process.env, and Lighthouse scores crater. This post configures Cloudflare Pages, GitHub Actions, and Lighthouse CI so deploy day is boring.
15 min readYour pool_size=5 default just met Black Friday traffic. 200 concurrent requests, 5 connections, 195 coroutines waiting on pool checkout — then timeouts cascade into a full outage. Here is how to configure connection pooling, read replicas, and circuit breakers for production traffic.
14 min readWithout caching at 1M transactions per day, the database becomes the bottleneck within weeks. But caching in a multi-tenant system is treacherous — one missing tenant prefix in a cache key leaks data between tenants.
13 min readAn N+1 query that takes 50ms with 10 rows takes 5 seconds with 1000. A memory leak that grows 1MB/hour OOMs in 3 days. Here is how to profile, detect, and load test a multi-tenant Python backend before production tells you first.
14 min readStop shipping Mermaid.js to your readers. Render diagrams to SVG at build time with rehype-mermaid and Playwright, cutting ~1MB of client-side JavaScript to zero.
7 min readasyncio.gather() is not always the answer. Here is when to parallelize database calls, when NOT to, and how to avoid the most common SQLAlchemy async session mistakes that cause subtle production bugs.
9 min read