System Desgin
Implement AI Agents with LangChain.js – Beginner Guide
TL;DR – LangChain.js lets you stitch LLMs, tools, and memory into a single runnable agent. – You only need Node ≥ 18, an OpenAI API key,…
// author
Nilesh Raut
’m Nilesh, a Software Development Engineer with 2+ years of experience, specializing in Go, JavaScript, Python, Docker, Kubernetes, Git, Jenkins, microservices, and system design (LLD/HLD), backed by a strong foundation in data structures and algorithms. Alongside my engineering journey, I bring 4+ years of hands-on experience in SEO, where I’ve worked extensively on content strategy, keyword research, technical SEO, and organic growth, helping products and businesses scale efficiently by aligning solid technology with search-driven performance.
380 articles
System Desgin
AI Code Reviewer in GitHub Actions: 2026 Guide
TL;DR – Native GitHub CodeQL misses semantic bugs that LLMs can spot. – Choose between local LLM inference and managed API with a decision…
leet code
Designing Microservices Caching with Redis Write‑Through
TL;DR – Write‑through keeps Redis and the primary DB in lockstep, eliminating most stale‑read bugs. – Double‑write adds 2‑5 ms latency per write, but you…
leet code
Optimizing Kafka for High‑Throughput Logging in Go
TL;DR – Use Sarama v1.44 async producer, not sync, for log fire‑and‑forget. – Set batch.size ≈ 1 MiB and linger.ms 5‑10 ms; this alone can lift throughput 30‑40×.…
leet code
Git Fetch vs Pull vs Rebase: When and How to Use Each
⚡️ Opening Hook Last month a senior engineer on the nileshblog.tech team pushed a hotfix, but the deployment crashed because the CI pipeline merged…
leet code
Tuning Persistent Volumes in Stateful Kubernetes
“Our production PostgreSQL pod started lagging at 5 seconds per query. The CPU stayed idle, the network was clean, but the latency exploded.” That anxiety‑inducing…
leet code
Implement Circuit Breakers in Python Microservices – Guide
TL;DR – Circuit breakers isolate flaky downstream calls, turning cascading failures into fast‑fail responses. – A bare‑bones Python class can manage CLOSED, OPEN, and…
leet code
AI in Human Life: Building Reliable Production Systems
In the fall of 2020, a medical AI system trained to spot signs of stroke on CT scans was rolled out across a European…
AI
How to Run LLMs Locally and Reduce AI Model API Costs
Learn how to run LLMs locally using Ollama, Open WebUI, DeepSeek, Qwen, and VS Code to reduce Claude/OpenAI API costs.
Backend Dev
From PR to Production: How Kubernetes Deployments Actually Work (Single Service + Microservices in the Real World)
Most developers know how to write code. Fewer understand what actually happens after they click “Merge Pull Request.” And even fewer truly understand what…
Backend Dev
Why Your Node.js App Is Fast Locally but Slow in Production
A senior engineer’s deep dive into performance illusions, real bottlenecks, and hard-earned lessons If you’ve shipped a Node.js service to production, you’ve almost certainly…
Backend Dev
Idempotency Explained: How to Design Safe APIs That Don’t Break in Production
Idempotency is one of those topics that looks simple on paper and brutal in production. Most engineers understand the definition. Fewer understand the failure…
Backend Dev
Redis Is Not a Database (Until You Treat It Like One)
Redis has an identity problem—and most teams make it worse. On paper, Redis is simple: an in-memory data store with optional persistence.In practice, Redis…
Backend Dev
20+ Git Commands Every Software Engineer Should Know (And Actually Use in Production)
Most software engineers use Git every single day. And most of us use about five commands. That’s not a problem—until something goes wrong. A…
leet code
Vibe Coding vs Engineering Judgment: Why Speed Alone Can’t Ship Reliable Software
Every generation of developers gets a new superpower. At one point, it was frameworks.Then cloud.Then CI/CD. Now it’s AI-assisted coding, often wrapped in a…
Backend Dev
Sprite Sheets in Node.js: How Video Platforms Show Fast Hover Previews Without Loading Hundreds of Images
Modern users don’t think in milliseconds — they think in feel. If a UI feels slow, it’s broken. And one of the most obvious…
leet code
Designing APIs That Are Hard to Misuse
Most backend failures don’t start with bad code.They start with APIs that were easy to misuse. Someone passed the wrong parameter.Someone called an endpoint…
Backend Dev
Stateless vs Stateful Services (With Real Examples)
If you’ve worked on backend systems long enough, you’ve probably heard this advice: “Make your services stateless.” It sounds simple. It sounds correct. And…