Backend Engineer specializing in scalable distributed systems. 3+ years building with Node.js, TypeScript, NestJS, PostgreSQL, and cloud infrastructure.https://uchkun.io/https://uchkun.io/blog/nodejs-race-conditions/https://uchkun.io/blog/nodejs-race-conditions/Node.js is single-threaded, but race conditions are real. Here's how they happen in async code and how to prevent them.Sat, 28 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/bun-vs-node-practical-guide/https://uchkun.io/blog/bun-vs-node-practical-guide/Bun promises speed. But is it ready for production backend work? A real-world comparison across the things that actually matter.Fri, 20 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/n-plus-one-problem/https://uchkun.io/blog/n-plus-one-problem/The N+1 problem is the most common performance killer in backend applications. Here's how to detect and fix it across different ORMs.Sun, 15 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/designing-idempotent-apis/https://uchkun.io/blog/designing-idempotent-apis/Your user clicked 'Pay' twice and got charged twice. Here's how to design APIs that handle retries, network failures, and duplicate requests without duplicating side effects.Tue, 10 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/event-loop-deep-dive/https://uchkun.io/blog/event-loop-deep-dive/Most explanations of the event loop are oversimplified. Here's what actually happens, phase by phase, and why it matters.Thu, 05 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/docker-multi-stage-builds/https://uchkun.io/blog/docker-multi-stage-builds/A real walkthrough of shrinking a Node.js Docker image from 1.2GB to 80MB using multi-stage builds, layer caching, distroless bases, and a production-ready Dockerfile template.Sun, 01 Mar 2026 00:00:00 GMThttps://uchkun.io/blog/database-indexing-explained/https://uchkun.io/blog/database-indexing-explained/Indexes can make or break your application performance. Here's how they work internally and when to use them.Wed, 25 Feb 2026 00:00:00 GMThttps://uchkun.io/blog/understanding-big-o-practically/https://uchkun.io/blog/understanding-big-o-practically/Forget the academic proofs. Here's how to spot O(n^2) hiding in your code, why hash maps change everything, and real refactoring examples that turned minutes into milliseconds.Sun, 15 Feb 2026 00:00:00 GMThttps://uchkun.io/blog/connection-pooling-explained/https://uchkun.io/blog/connection-pooling-explained/You're opening a new database connection for every request and wondering why your server dies under load. Here's how connection pooling works and how to configure it properly.Thu, 05 Feb 2026 00:00:00 GMThttps://uchkun.io/blog/api-rate-limiting-done-right/https://uchkun.io/blog/api-rate-limiting-done-right/Rate limiting protects your API from abuse. Here's how the major algorithms work and which one to pick for your use case.Fri, 30 Jan 2026 00:00:00 GMThttps://uchkun.io/blog/typescript-strict-mode-guide/https://uchkun.io/blog/typescript-strict-mode-guide/Every `any` in your codebase is a bug waiting to happen. Here's how to enable strict mode, survive the migration, and use TypeScript the way it was meant to be used.Tue, 20 Jan 2026 00:00:00 GMThttps://uchkun.io/blog/git-rebase-vs-merge/https://uchkun.io/blog/git-rebase-vs-merge/A practical guide to rebase vs merge from someone who's destroyed production history and lived to tell about it. Interactive rebase, fixup, squash, and real team workflows.Sat, 10 Jan 2026 00:00:00 GMThttps://uchkun.io/blog/git-bisect-debug-like-pro/https://uchkun.io/blog/git-bisect-debug-like-pro/Binary search through your commit history to find exactly which commit broke things. Manual, automated, and CI-integrated approaches.Sun, 28 Dec 2025 00:00:00 GMThttps://uchkun.io/blog/redis-beyond-caching/https://uchkun.io/blog/redis-beyond-caching/Redis is not just a cache. I've used it as a message queue, a rate limiter, a leaderboard engine, and a real-time event bus. Here's how, and when to stop.Mon, 15 Dec 2025 00:00:00 GMThttps://uchkun.io/blog/graceful-shutdown-nodejs/https://uchkun.io/blog/graceful-shutdown-nodejs/Your Node.js server gets SIGTERM, immediately dies, and 47 users get 502 errors. Here's how to shut down properly in production.Thu, 20 Nov 2025 00:00:00 GMThttps://uchkun.io/blog/mongodb-aggregation-pipeline/https://uchkun.io/blog/mongodb-aggregation-pipeline/Stop fetching all documents and filtering in JavaScript. MongoDB's aggregation pipeline can do joins, grouping, pagination, and analytics in a single query.Wed, 05 Nov 2025 00:00:00 GMThttps://uchkun.io/blog/hash-tables-under-the-hood/https://uchkun.io/blog/hash-tables-under-the-hood/Hash tables power objects, dictionaries, sets, and caches. Here's what actually happens when you write obj[key], and when O(1) breaks down.Mon, 20 Oct 2025 00:00:00 GMThttps://uchkun.io/blog/error-handling-patterns-nodejs/https://uchkun.io/blog/error-handling-patterns-nodejs/Empty catch blocks, generic error messages, and silent failures. Here are the patterns I use to handle errors properly in production Node.js applications.Sun, 05 Oct 2025 00:00:00 GMT