Himangshu Saikia - BlogTechnical articles on backend architecture, Linux systems programming, and cloud engineering by Himangshu Saikia.https://himon.xyz/en-usHere's a Subscription, You Build Ithttps://himon.xyz/blog/heres-a-subscription-you-build-it/https://himon.xyz/blog/heres-a-subscription-you-build-it/A client told me someone could use AI to build the same thing cheaper. I said here's a subscription, you build it. Why an engineer using AI and a non-technical person using AI produce completely different products.Thu, 08 Oct 2026 00:00:00 GMTHimangshu SaikiaIdempotency in APIs: Stop Charging Users Twicehttps://himon.xyz/blog/idempotency-in-apis/https://himon.xyz/blog/idempotency-in-apis/Why retries break your API and how a simple idempotency key can save you from double charges, duplicate orders, and angry users.Sat, 26 Sep 2026 00:00:00 GMTHimangshu SaikiaHow GPIO Works on a Microcontroller: From Code to Electrical Signalhttps://himon.xyz/blog/how-gpio-works/https://himon.xyz/blog/how-gpio-works/A software developer's guide to understanding how GPIO pins work on microcontrollers - how a simple line of code becomes an electrical signal.Mon, 14 Sep 2026 00:00:00 GMTHimangshu SaikiaRedis vs NATS vs Kafka: Choosing the Right Message Brokerhttps://himon.xyz/blog/redis-vs-nats-vs-kafka/https://himon.xyz/blog/redis-vs-nats-vs-kafka/A simple, no-nonsense comparison of Redis, NATS, and Kafka - when to use each one and why.Sat, 12 Sep 2026 00:00:00 GMTHimangshu SaikiaWhy SQLite in WAL Mode is All You Need for Most Production Backendshttps://himon.xyz/blog/sqlite-wal-mode-production/https://himon.xyz/blog/sqlite-wal-mode-production/Learn how SQLite's Write-Ahead Logging (WAL) mode lets you read while writing, speeds up your queries, and handles real production apps.Wed, 02 Sep 2026 00:00:00 GMTHimangshu SaikiaHow I Built a Simple Container Engine in Go to Understand Namespaces and cgroupshttps://himon.xyz/blog/building-container-engine-in-go/https://himon.xyz/blog/building-container-engine-in-go/A simple guide on how Linux namespaces, cgroups v2, and chroot works by building a small container runtime in Go.Thu, 20 Aug 2026 00:00:00 GMTHimangshu SaikiaHow We Should Write Backendhttps://himon.xyz/blog/how-we-should-write-backend/https://himon.xyz/blog/how-we-should-write-backend/Thoughts on backend architecture - patterns and practices that scale well and are a joy to work with.Tue, 30 Jun 2026 00:00:00 GMTHimangshu SaikiaFinding the Nearest Help in Milliseconds with PostgreSQLhttps://himon.xyz/blog/emergency-sos-system/https://himon.xyz/blog/emergency-sos-system/Using the Haversine formula directly in SQL to route emergency responses efficiently without overwhelming the application layer.Mon, 22 Jun 2026 00:00:00 GMTHimangshu SaikiaMy First Bloghttps://himon.xyz/blog/my-first-blog/https://himon.xyz/blog/my-first-blog/Welcome to my new blog! Sharing some thoughts on why I decided to start writing and what to expect.Wed, 04 Feb 2026 00:00:00 GMTHimangshu Saikia