https://www.surendarpd.dev/notes/ Write-ups and how-tos from building on the web. en https://www.surendarpd.dev/notes/accessibility-checks-on-every-push/ https://www.surendarpd.dev/notes/accessibility-checks-on-every-push/ axe and Playwright on GitHub Actions, run on every page in both themes: free, about three minutes, and it caught real bugs a manual check missed. Wed, 21 Oct 2026 00:00:00 GMT Accessibility Playwright GitHub Actions Testing https://www.surendarpd.dev/notes/publish-in-sanity-rebuild-on-vercel/ https://www.surendarpd.dev/notes/publish-in-sanity-rebuild-on-vercel/ A filtered Sanity webhook calling a Vercel deploy hook, so publishing content rebuilds the static site, and drafts and unused types don't. Fri, 16 Oct 2026 00:00:00 GMT Sanity Vercel Webhooks CI/CD https://www.surendarpd.dev/notes/generated-share-images/ https://www.surendarpd.dev/notes/generated-share-images/ Replace hand-made Open Graph images with ones generated from each page's title: free, open source, on brand, and painless across many locales. Mon, 12 Oct 2026 00:00:00 GMT Open Graph SEO Astro Next.js Sanity https://www.surendarpd.dev/notes/build-pages-in-sanity/ https://www.surendarpd.dev/notes/build-pages-in-sanity/ A typed page builder with Sanity and Astro: every page is a document made of designed blocks, one route renders them all, and TypeScript guards the seams. Mon, 05 Oct 2026 00:00:00 GMT Sanity Astro TypeScript CMS https://www.surendarpd.dev/notes/llm-agent-that-cant-make-up-prices/ https://www.surendarpd.dev/notes/llm-agent-that-cant-make-up-prices/ Designing a WhatsApp sales agent for hotels where the model understands and phrases, while code owns prices, dates and leads, and evals gate every change. Wed, 24 Jun 2026 00:00:00 GMT AI LLMs RAG LangGraph https://www.surendarpd.dev/notes/signed-url-direct-uploads/ https://www.surendarpd.dev/notes/signed-url-direct-uploads/ How a healthcare app uploads large patient videos straight to cloud storage with short-lived signed URLs, so the API never touches the bytes. Tue, 16 Sep 2025 00:00:00 GMT Node.js Google Cloud Security NestJS https://www.surendarpd.dev/notes/live-vehicle-tracking-with-redis/ https://www.surendarpd.dev/notes/live-vehicle-tracking-with-redis/ Thousands of drivers reporting every few seconds: Redis geo sets, H3 hexagons, atomic updates and pub/sub for a live map and fast dispatch. Tue, 11 Mar 2025 00:00:00 GMT Redis Real-time Geospatial WebSockets