nodejs
nodejs
Testing Node.js — Unit, Integration, and E2E
Comprehensive testing strategies for Node.js applications with Jest, Supertest, and Testcontainers — from unit tests to end-to-end API testing
System Design / Cloud / Code
Engineering thoughts,
written in code.
Real-world system design, backend patterns, and practical guides for engineers who build at scale.
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nodejs
nodejs
WebSockets with Socket.io in Node.js
Build real-time applications with WebSockets and Socket.io in Node.js — rooms, namespaces, scaling with Redis adapter, and handling reconnection
nodejs
nodejs
Database Integration — PostgreSQL with Node.js
Connect Node.js to PostgreSQL using pg, Knex.js, and Prisma ORM. Learn connection pooling, migrations, transactions, and query optimization
nodejs
nodejs
Performance Optimization and Profiling in Node.js
Profile and optimize Node.js applications — find memory leaks, reduce event loop lag, use worker threads, cluster mode, and caching strategies
nodejs
nodejs
Redis — Caching, Sessions, Pub/Sub in Node.js
Use Redis with Node.js for caching, session storage, pub/sub messaging, rate limiting, and distributed locks using ioredis
nodejs
nodejs
Node.js Architecture — Event Loop Deep Dive
Understand the Node.js event loop, its phases, microtasks vs macrotasks, and how non-blocking I/O actually works under the hood with libuv
nodejs
nodejs
Error Handling and Logging in Production Node.js
Build robust error handling and structured logging for production Node.js apps using Winston, Pino, custom error classes, and centralized error middleware
nodejs
nodejs
MongoDB with Mongoose — Patterns and Pitfalls
Master MongoDB with Mongoose in Node.js — schema design, indexing strategies, population, aggregation pipelines, and common anti-patterns to avoid
nodejs
nodejs
Message Queues with RabbitMQ and SQS in Node.js
Implement reliable message queuing in Node.js with RabbitMQ (amqplib) and AWS SQS. Learn exchange types, dead letter queues, retry patterns, and guaranteed delivery
nodejs
nodejs
Docker and Containerization for Node.js
Containerize Node.js applications with Docker — multi-stage builds, Docker Compose for development, health checks, security best practices, and production optimization
nodejs
nodejs
File Uploads and S3 Integration in Node.js
Handle file uploads in Node.js with Multer, stream large files to AWS S3, generate presigned URLs, and implement multipart uploads for large files
nodejs
nodejs
Building REST APIs with Express and Nest.js
A comprehensive guide to building production-ready REST APIs with Express.js and Nest.js, covering routing, middleware, validation, and best practices
nodejs
nodejs
Deploying Node.js to AWS
Deploy Node.js applications to AWS using ECS Fargate, Lambda, and Elastic Beanstalk — with CI/CD pipelines, auto-scaling, and monitoring
nodejs
nodejs
Real Project — Build a Production Node.js API
Build a complete production-ready REST API with Node.js, Express, PostgreSQL, Redis, JWT auth, testing, Docker, and CI/CD — putting it all together
nodejs
nodejs
Authentication — JWT, Sessions, OAuth in Node.js
Implement secure authentication in Node.js using JWT tokens, server-side sessions, and OAuth 2.0 with Passport.js and best security practices
tutorials
Claude Code Skills — Build a Better Engineering Workflow with AI-Powered Code Reviews, Security Scans, and More
A practical guide to building Claude Code custom skills for engineering workflows — automated code reviews, security scanning, test generation, commit hygiene, and CI integration with real skill definitions you can use today.
tutorials
Building an AI Voicebot for Visitor Check-In — A Practical Guide to Handling the Messy Parts
A practical guide to building an AI-powered voicebot for visitor check-in at offices and buildings — covering STT/TTS pipeline, LLM conversation design, error handling, fallback strategies, latency optimization, and the real-world problems nobody warns you about.
security
Server Security Best Practices — Complete Hardening Guide for Production Systems
A comprehensive guide to server security best practices covering SSH hardening, firewall configuration, TLS setup, privilege escalation prevention, logging, automated patching, and incident response for production Linux servers.
tutorials
Staff Engineer Study Plan for MAANG Interviews — The Complete 12-Week Roadmap
A battle-tested 12-week study plan for senior engineers targeting Staff/L6+ roles at Meta, Apple, Amazon, Netflix, and Google. Covers system design, coding, leadership, behavioral prep, and domain deep-dives with weekly schedules, resources, and practice problems.
security
XSS and CSRF Explained — The Complete Guide with Real Attack Examples and Defenses
A deep dive into Cross-Site Scripting (XSS) and Cross-Site Request Forgery (CSRF/XSRF) — how they work, real attack examples with code, and defense strategies every developer should implement.
security
OWASP Top 10 (2021) — Every Vulnerability Explained with Code
A developer-focused guide to the OWASP Top 10 2021 — every vulnerability explained with real attack code, vulnerable code examples, and production-ready fixes for Node.js, Python, and Java.
security
HTTP Cookies Security — Everything Developers Get Wrong
A complete guide to HTTP cookie security — how cookies work under the hood, every security flag explained, real attack scenarios (session hijacking, CSRF, cookie tossing), and production-grade code for Express, Django, and Spring Boot.
security
Buffer Overflow Attacks — How Memory Corruption Actually Works
A deep technical guide to buffer overflow attacks — stack overflows, heap overflows, integer overflows, and format string bugs. Includes memory layout diagrams, exploit code walkthroughs, and modern defense mechanisms like ASLR, NX, stack canaries, and memory-safe languages.
security
Format String Vulnerabilities — The Read-Write Primitive Hiding in printf()
A deep technical guide to format string vulnerabilities — how printf() becomes a read-write primitive for memory, exploitation techniques from info leak to arbitrary write to full RCE, real CVEs, and how to prevent them in C, C++, and modern languages.
security
SQL Injection: The Complete Guide to Understanding, Preventing, and Detecting SQLi Attacks
A deep-dive into SQL injection attacks — how they work, every type of SQLi (in-band, blind, out-of-band), real-world examples, and the complete defense playbook with code examples in Node.js, Python, Java, Go, and PHP.
security
Software Security in the AI Era: How to Write Secure Code When AI Writes Code Too
A comprehensive guide to writing secure software in 2026, covering traditional OWASP vulnerabilities, AI-specific threats like prompt injection and model poisoning, secure SDLC practices, and practical code examples for building defense-in-depth applications.
security
Building a Vulnerability Detection System That Developers Actually Use
How to architect and build an internal vulnerability detection system that developers don't hate. Covers SAST/SCA/secret scanning integration, PR-native workflows, false positive reduction via feedback loops, auto-fix generation, and the metrics that prove your system works.
tutorials
How to Be a Full-Time Freelancer: Resources, Finding Clients, and Building a Sustainable Business
A comprehensive guide to becoming a full-time freelancer in tech. Learn how to find clients, set your rates, build a portfolio, manage finances, and create a sustainable freelance business from scratch.
software-design
Deep Dive on Redis: Architecture, Data Structures, and Production Usage
A comprehensive guide to Redis — covering its single-threaded architecture, data structures (strings, hashes, sorted sets, streams), persistence (RDB/AOF), replication, clustering with hash slots, pub/sub, Lua scripting, caching patterns, rate limiting, distributed locks, and production best practices for running Redis at scale.
software-design
Deep Dive on Apache Kafka: A System Design Interview Perspective
A comprehensive guide to Apache Kafka for system design interviews — covering its distributed commit log architecture, partitioning and replication, producer and consumer internals, consumer groups, exactly-once semantics, compacted topics, schema evolution, Connect and Streams APIs, and production patterns for building event-driven systems at scale.
software-design
Deep Dive on API Gateway: A System Design Interview Perspective
A comprehensive guide to API Gateways for system design interviews — covering request lifecycle, authentication and authorization, rate limiting algorithms (token bucket, sliding window), routing and load balancing, circuit breakers, response caching, request aggregation, TLS termination, protocol translation, and production patterns with Kong, NGINX, AWS API Gateway, and Envoy.
software-design
Deep Dive on Elasticsearch: A System Design Interview Perspective
A comprehensive guide to Elasticsearch for system design interviews — covering inverted indexes, cluster architecture (master/data/coordinating nodes), sharding and replication, the write path (translog, refresh, flush, merge), the read path (scatter-gather, BM25 scoring), mappings, analyzers, aggregations, scaling strategies, and production best practices for building search-heavy systems.
software-design
REST API Design: Pagination, Versioning, and Best Practices
A comprehensive guide to designing production-grade REST APIs — covering resource naming, HTTP methods, pagination strategies, versioning approaches, error handling, rate limiting, and the communication problems REST solves.