https://sahilchalke.com/#writing Notes on AI, DevOps, testing and the fundamentals. en https://sahilchalke.com/blog/how-dns-actually-works https://sahilchalke.com/blog/how-dns-actually-works Mon, 22 Jun 2026 00:00:00 GMT DNS is the internet's contact list. Understanding the lookup chain — and the one word, TTL — explains a shocking number of production incidents. https://sahilchalke.com/blog/load-balancers-and-cdns https://sahilchalke.com/blog/load-balancers-and-cdns Wed, 10 Jun 2026 00:00:00 GMT No diagrams, no jargon — just the analogy that finally makes two of the most important scaling concepts click. https://sahilchalke.com/blog/docker-in-one-sentence https://sahilchalke.com/blog/docker-in-one-sentence Sun, 24 May 2026 00:00:00 GMT Containers confuse a lot of people for far too long. One sentence collapses the whole concept into something obvious. Here it is. https://sahilchalke.com/blog/spaced-repetition-for-engineers https://sahilchalke.com/blog/spaced-repetition-for-engineers Fri, 08 May 2026 00:00:00 GMT You solve the problem, you feel smart, you forget it in a week. Here's the learning technique that fixes that — borrowed from language learners and weirdly underused by devs. https://sahilchalke.com/blog/killing-flaky-tests https://sahilchalke.com/blog/killing-flaky-tests Tue, 28 Apr 2026 00:00:00 GMT A flaky test is worse than no test — it teaches your whole team to ignore the colour red. Here's why tests flake and how to make them deterministic. https://sahilchalke.com/blog/working-with-ai-pair-programmers https://sahilchalke.com/blog/working-with-ai-pair-programmers Thu, 09 Apr 2026 00:00:00 GMT AI didn't take the job — it took the intimidating empty editor. What's left is the part that was always the real work. Here's how to keep your edge. https://sahilchalke.com/blog/feeding-context-to-llms https://sahilchalke.com/blog/feeding-context-to-llms Thu, 26 Mar 2026 00:00:00 GMT Everyone obsesses over which model to use. The quiet truth of building useful AI features is that your context matters more than your model. https://sahilchalke.com/blog/choosing-boring-technology https://sahilchalke.com/blog/choosing-boring-technology Wed, 11 Mar 2026 00:00:00 GMT Every few months a shiny new framework declares the old one dead. Here's a calmer way to pick what you build on — and where to actually spend your innovation budget. https://sahilchalke.com/blog/linux-commands-worth-knowing https://sahilchalke.com/blog/linux-commands-worth-knowing Sun, 22 Feb 2026 00:00:00 GMT You don't need to memorise a thousand commands. You need a small, sharp set you actually understand. Here's the toolkit that covers most real situations. https://sahilchalke.com/blog/what-happens-when-you-deploy https://sahilchalke.com/blog/what-happens-when-you-deploy Fri, 06 Feb 2026 00:00:00 GMT You run a command, a URL goes live, and the internet can suddenly reach your code. Here's the journey those bytes take — tying together DNS, load balancers and containers.