Posts by Deepak Kumar.https://thedeepak.dev/enhttps://medium.com/@i-am-chitti/load-testing-a-url-shortener-e3c7f9b4e504https://medium.com/@i-am-chitti/load-testing-a-url-shortener-e3c7f9b4e504Pushing the linkpulse redirect path with k6 until something gave. A fixed VU test measures concurrency, not throughput, and at 3,000 requests a second one Node process ran out of CPU while Redis and Postgres sat at about 25%.Sun, 27 Sep 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/building-a-url-shortener-six-design-decisions-and-the-alternatives-i-rejected-c580c8f7ee16https://medium.com/@i-am-chitti/building-a-url-shortener-six-design-decisions-and-the-alternatives-i-rejected-c580c8f7ee16Six decisions behind a URL shortener that runs in public, each with the alternative I rejected: a 302 rather than a 301, caching misses as well as hits, a sliding window rate limiter in Lua, and refresh tokens with reuse detection.Sun, 27 Sep 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/testing-wp-cli-commands-with-phpunit-and-behat-a0d285230acfhttps://medium.com/@i-am-chitti/testing-wp-cli-commands-with-phpunit-and-behat-a0d285230acfWhat to prove about a WP-CLI command before it runs unattended against production. PHPUnit for the logic, Behat against the real wp binary, and the places WP-CLI resists unit testing.Sat, 05 Sep 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/i-built-a-twitter-style-feed-to-find-out-what-fan-out-actually-costs-80f7af9e2ccdhttps://medium.com/@i-am-chitti/i-built-a-twitter-style-feed-to-find-out-what-fan-out-actually-costs-80f7af9e2ccdPush and pull feeds built over the same data and measured. Fan-out costs about 12 microseconds per follower, a timeline entry about 80 bytes in Redis, and the read advantage was far smaller than expected.Fri, 21 Aug 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/celebrities-vs-the-rest-of-us-designing-a-twitter-style-feed-11c6b3b52a2fhttps://medium.com/@i-am-chitti/celebrities-vs-the-rest-of-us-designing-a-twitter-style-feed-11c6b3b52a2fWhy one feed design cannot serve an account with eleven followers and one with sixty million. Push, pull, and the hybrid model that treats celebrities differently.Fri, 21 Aug 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/enterprise-gutenberg-blocks-a-typescript-first-architecture-for-wordpress-at-scale-67af6c3c32c4https://medium.com/@i-am-chitti/enterprise-gutenberg-blocks-a-typescript-first-architecture-for-wordpress-at-scale-67af6c3c32c4One attribute rename broke 12 blocks without a single error. TypeScript for block attributes, one Webpack bundle for dozens of blocks, and SCSS shared between the frontend and the editor.Sun, 26 Jul 2026 00:00:00 GMThttps://medium.com/@i-am-chitti/software-architectural-patterns-a99cbde19027https://medium.com/@i-am-chitti/software-architectural-patterns-a99cbde19027A short tour of eight patterns, from layered and monolithic to microservices, event driven and peer to peer, with where each one fits and where it hurts.Sat, 02 Aug 2025 00:00:00 GMThttps://medium.com/@i-am-chitti/from-scratch-build-your-own-caching-proxy-server-c9fde6158037https://medium.com/@i-am-chitti/from-scratch-build-your-own-caching-proxy-server-c9fde6158037A Node CLI that sits in front of any server, caches its responses locally and marks each reply with an X-Cache HIT or MISS header, with a command to purge the cache.Sat, 16 Nov 2024 00:00:00 GMThttps://medium.com/@i-am-chitti/building-a-cli-app-in-node-js-5ac6fd88f82bhttps://medium.com/@i-am-chitti/building-a-cli-app-in-node-js-5ac6fd88f82bBuilding a Node.js CLI with commander.js, then making it pleasant with Chalk, Inquirer and loaders. The example project prints a user's recent GitHub activity.Sat, 02 Nov 2024 00:00:00 GMT