https://blog.mdashikjs.com Personal blog of Md Ashik — writing about backend engineering, system design, and building scalable products. en-us Wed, 18 Mar 2026 00:00:00 GMT https://blog.mdashikjs.com/blog/redis-caching-nestjs https://blog.mdashikjs.com/blog/redis-caching-nestjs Database round-trips were the bottleneck in our NestJS API. Here is how a disciplined cache-aside layer dropped P95 latency from 340ms to 28ms without making invalidation painful. Wed, 18 Mar 2026 00:00:00 GMT Backend https://blog.mdashikjs.com/blog/trpc-nextjs-type-safe-api https://blog.mdashikjs.com/blog/trpc-nextjs-type-safe-api I have shipped REST, GraphQL, and now tRPC in production. For an app where one team owns both the frontend and the backend, tRPC is the most productive by a wide margin. Sun, 22 Feb 2026 00:00:00 GMT Backend https://blog.mdashikjs.com/blog/scaling-mongodb-200k-users https://blog.mdashikjs.com/blog/scaling-mongodb-200k-users When I joined, the cluster was a single replica set handling 40K daily users. 18 months later we were at 200K with a 2x-improved P95. Here is what actually moved the needle. Sat, 10 Jan 2026 00:00:00 GMT Backend https://blog.mdashikjs.com/blog/zero-downtime-deploys-pm2-github-actions https://blog.mdashikjs.com/blog/zero-downtime-deploys-pm2-github-actions Zero downtime sounds like magic. It is mostly discipline: reload instead of restart, health checks before trusting the new version, and enough instances that one going down does not matter. Sat, 15 Nov 2025 00:00:00 GMT DevOps