Microservices Auth: We Tried 4 Patterns, Here's What Actually Worked
Authentication between microservices is one of those things that seems simple until you actually try to implement it. We went through 4 different …
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113
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2026
11 articles
Node.js Memory Leak: Two Weeks to Find One Missing removeListener()
Incident Report: Node.js Memory Leak Analysis Date: 2026-01-20 Severity: P1 (Production Impact) MTTR: 14 days Root Cause: Event listener leak in …
Redis Caching: The Mistakes That Cost Us $12K/Month
Common Redis Caching Mistakes (Q&A Format) Q: Our Redis instance is 32GB but our database is only 8GB. Is this normal? A: No, this is a red flag …
PostgreSQL JSONB: Three Months of Pain and What I Learned
Executive Summary This document analyzes a three-month production deployment of PostgreSQL JSONB columns, documenting performance issues encountered, …
React Server Components: I Get It Now
Took me six months to actually understand RSC. Not the “I read the docs” understanding - the visceral “oh THAT’S why” moment that only comes from …
Docker Build Times: From 8 Minutes to 40 Seconds
Step-by-Step Guide: Optimizing Docker Build Performance Introduction Problem Statement: Docker builds taking 8+ minutes per PR, causing CI bottlenecks …
Why Our API Rate Limiter Failed (And How We Fixed It)
Rate limiting seems simple until it isn’t. We thought we had it figured out - Redis counters, sliding windows, the works. Then a client with a …
TypeScript Generics: A Practical Guide (No PhD Required)
Learning TypeScript Generics Through Real Examples Introduction: Why Generics? Let’s start with a question I get asked all the time: “I’ve been …
Database Indexing: The Stuff Nobody Tells You
Indexes are supposed to make queries fast. Sometimes they make them slower. Here’s what I wish someone told me before I tanked production performance …
Git Rebase: Stop Being Scared of It
Everyone tells you to avoid git rebase. “It’s dangerous!” “You’ll lose commits!” “Just merge!” I used to think that too. Then I joined a team that …
Webhooks at Scale: What We Learned Sending 10M/Day
We send about 10 million webhooks per day now. Started at 100K/day a year ago. Thought it would scale fine. It didn’t. Here’s everything that broke …
2025
42 articles
Kubernetes Secrets: How We Leaked API Keys (And Fixed It)
Found our AWS access keys in a public GitHub repo last month. Fun times. Here’s how it happened and what we actually did to prevent it. How we leaked …
GraphQL N+1 Problem: From 2000 Queries to 3
GraphQL makes it stupidly easy to write queries that murder your database. Our homepage was hitting the database 2,031 times per page load. Yeah. …
Docker Production Best Practices: Security, Performance, and Reliability
Docker has become the standard for containerization, but running containers in production requires following best practices for security, performance, …
Laravel Modern Development: Best Practices and Patterns
Laravel remains one of the most popular PHP frameworks. Here are modern development practices for building scalable Laravel applications. 1. Project …
Go Concurrency Patterns: Goroutines, Channels, and Best Practices
Go’s concurrency model is one of its strongest features. Here’s how to effectively use goroutines, channels, and concurrency patterns. Goroutines …
Spring Boot Best Practices: Building Production-Ready Applications
Spring Boot is the most popular Java framework for building enterprise applications. Here are best practices for building production-ready Spring Boot …
Mastering Asynchronous Operations in Node.js: Practical Strategies
Asynchronous programming is at the heart of Node.js. Here are practical strategies to master async operations. Understanding Async Patterns Callbacks …
Node.js Architecture Explained: Event Loop, Async Code, and Scaling
Understanding Node.js architecture is crucial for building scalable applications. Let’s dive into the event loop, async operations, and how Node.js …
GraphQL vs REST API: When to Use Which
GraphQL and REST are both popular API design approaches. Here’s when to use each. REST API Overview REST (Representational State Transfer) uses HTTP …
API Design Best Practices: Building Developer-Friendly APIs
Good API design is crucial for developer experience and system success. Here are best practices for designing RESTful APIs. 1. Use RESTful Conventions …
Browser-based Performance Testing with k6: Hands-on Guide
This write-up condenses the published DEV tutorial “Browser-based performance testing with K6” into an actionable walkthrough for frontend teams. Why …
Frontend Performance Optimization: A Condensed Playbook
This post distills the key ideas from the published DEV article “Frontend Performance Optimization: A Comprehensive Guide 🚀” into a concise, …
React Query for Efficient Data Fetching (2025 Quickstart)
This article summarizes the DEV post “How to Use React Query for Efficient Data Fetching” and focuses on a minimal, production-ready setup. Why React …
Rust for JavaScript Developers: A Practical Guide
Coming from JavaScript to Rust? Here’s a practical guide to help you make the transition. Why Rust? Rust offers: Memory safety without garbage …
TypeScript Best Practices for 2025: Write Better Type-Safe Code
TypeScript has become the de facto standard for large-scale JavaScript applications. Here are the best practices to write better type-safe code in …
9 Developer Productivity Tools You Wish You Knew Sooner
Here are 9 developer productivity tools that can dramatically improve your workflow and save you hours every week. 1. Warp Terminal What it is: A …
Modern Web Design Styles Every Frontend Developer Must Know (2025 Guide)
Web design is constantly evolving. Here are the modern design styles every frontend developer should know in 2025. 1. Glassmorphism Glassmorphism …
The Sensorimotor Gap: What LLMs Can't Learn from Text
What LLMs can’t learn from text — and why human-like understanding may require bodies, not bigger models. The Fundamental Limitation Large Language …
How I Scrubbed 100% of the AI Slop From My Game & Cut Code by 45%
Three weeks ago, I had 191,000 tokens in my upcoming tactical survival roguelite game’s codebase. Today, I have 104,000 tokens: a 45% reduction. …
I Thought AI Output Was Free to Use. I Was Wrong.
And I pay for it literally. You should know this if you use AI-generated content for business purposes. The Common Assumption Most developers and …
Should Software Engineers Have Good Presentation Skills?
Spoiler alert: yes. But not for the reasons you might think. The Common Misconception Many engineers believe that presentation skills are only …
Reinventing Kubernetes in 2025: A Post-Mortem of My 'Simple' Stack
Kubernetes is powerful, but it’s also complex. This is my journey of trying to build a “simple” Kubernetes stack and the lessons learned along the …
Running FastAPI in Production on a VPS: Step-by-Step Guide
Deploying FastAPI applications to production on a VPS requires careful configuration. This step-by-step guide will walk you through the entire …
Vue's New Declarative UI Syntax: Moving Towards Mobile Development Patterns
Vue is introducing support for declarative UI syntax, bringing it closer to mobile development patterns seen in Kotlin and Swift. This new approach …
React SSR Server Action Protocol: Critical Security Vulnerability
A critical security vulnerability has been discovered in React’s Server-Side Rendering (SSR) Server Action protocol that could lead to Remote Code …
Building a Frontend Error Monitoring SDK from Scratch
Don’t just be a tool user! Let’s build a frontend error monitoring SDK from scratch. This hands-on guide will walk you through creating your own error …
How I Cut My Debugging Time in Half as a Front-End Developer
Debugging is an essential skill for any developer, but it can be time-consuming. Here are practical strategies that helped me cut my debugging time in …
Will WebAssembly Kill JavaScript? Let's Find Out
The question “Will WebAssembly kill JavaScript?” has been circulating in the developer community for years. Let’s explore this topic with a practical …
Django: What's New in 6.0
Django 6.0 was released today, starting another release cycle for the loved and long-lived Python web framework (now 20 years old!). It comes with a …
Vite vs Turbopack: Frontend Build Tools in 2025
This summary distills the DEV post “⚡ Vite vs Turbopack — The Present & Future of Frontend Build Tools (2025 Edition)” into key takeaways for teams …
Rust + WebAssembly + Tailwind: Building Fast, Styled UIs
Based on the DEV article “Building Performant UI with Rust, WebAssembly, and Tailwind CSS,” this summary focuses on the architecture and steps to …
Go HTTP Timeouts & Resilience Defaults
Client defaults Set Timeout on http.Client; set Transport with DialContext timeout (e.g., 3s), TLSHandshakeTimeout (3s), ResponseHeaderTimeout (5s), …
Benchmarking Go REST APIs with k6
Test design Define goals: latency budgets (p95/p99), error ceilings, throughput targets. Scenarios: ramping arrival rate, soak tests, spike tests; …
Node.js Worker Threads for CPU Tasks
When to use CPU-bound tasks (crypto, compression, image/video processing) that would block event loop. Avoid for short, tiny tasks—overhead may …
Kafka Reliability Playbook
Producers acks=all, min.insync.replicas>=2, idempotent producer on; enable transactions for exactly-once pipelines. Tune batch.size/linger.ms for …
Scaling Node.js: Fastify vs Express
Performance notes Fastify: schema-driven, AJV validation, low-overhead routing; typically better RPS and lower p99s. Express: mature ecosystem; …
Rate Limiting Java REST APIs
Approaches Token bucket for burst+steady control; sliding window for fairness. Enforce at edge (gateway/ingress) plus app-level for per-tenant safety. …
Go High-Performance Concurrency Playbook
Principles Keep goroutine count bounded; size pools to CPU/core and downstream QPS. Apply backpressure: bounded channels + select with default to shed …
CI/CD Pipeline Observability & Guardrails
Metrics Lead time, MTTR, change failure rate, deploy frequency. Stage timing (queue, build, test, deploy); flake rate; retry counts. Tracing & logs …
Laravel Queues with Horizon: Reliable Setup
Workers & balancing Define queue priorities; dedicate workers per queue (emails, webhooks, default). Use balance strategies (simple, auto) and cap max …
API Security Hardening Checklist
Identity & access Enforce strong auth (OIDC/JWT); short-lived tokens + refresh; audience/issuer checks. Fine-grained authz (RBAC/ABAC); …
Spring Boot Observability: Metrics, Traces, Logs
Metrics Use Micrometer + Prometheus: management.endpoints.web.exposure.include=prometheus,health,info. Add JVM+Tomcat/db pool meters; set percentiles …
2024
30 articles
DevOps Incident Response Playbook
During incident Roles: incident commander, comms lead, ops/feature SMEs, scribe. Declare severity quickly; open shared channel/bridge; timestamp …
PostgreSQL Performance Tuning: The Power of work_mem
PostgreSQL’s work_mem parameter is one of the most impactful yet misunderstood configuration settings for database performance. This post explores how …
Tuning Kafka Consumers (Java)
Core settings max.poll.interval.ms sized to processing time; max.poll.records to batch size. fetch.min.bytes/fetch.max.wait.ms to trade latency vs …
REST API Design Best Practices: Building Production-Ready APIs
Designing a REST API that is intuitive, maintainable, and scalable requires following established best practices. Here’s a comprehensive guide. 1. Use …
Go Profiling in Production with pprof
Capturing safely Expose /debug/pprof behind auth/VPN; or run curl -sK -H "Authorization: Bearer ...". CPU profile: go tool pprof …
Microservices Communication Patterns: Synchronous vs Asynchronous
Microservices communicate through various patterns, each with trade-offs. Understanding when to use synchronous vs asynchronous communication is …
Circuit Breakers with Resilience4j
Core settings Sliding window (count/time), failure rate threshold, slow-call threshold, minimum calls. Wait duration in open state; half-open …
Database Optimization Techniques: Performance Tuning Guide
Database performance is critical for application scalability. Here are proven optimization techniques. 1. Indexing Strategy When to Index -- Index …
RabbitMQ High Availability & Tuning
Queue types Prefer quorum queues for HA; classic for transient/high-throughput if loss acceptable. Set durability/persistence appropriately; avoid …
Java GC Tuning: G1 and ZGC in Practice
Choosing G1: balanced latency/throughput for heaps 4–64GB; predictable pauses. ZGC: sub-10ms pauses on large heaps; great for latency-sensitive APIs; …
Go Database Pooling Patterns (sqlx/pgx)
Sizing Pool size ≈ CPU cores * 2–4 per service instance; avoid per-request opens. For PgBouncer tx-mode: disable session features; avoid …
Node.js Event Loop Internals (2024)
Phases refresher timers → pending → idle/prepare → poll → check → close callbacks. Microtasks (Promises/queueMicrotask) run after each phase; …
Microservices vs Monolith: Choosing the Right Architecture
Choosing between microservices and monolithic architecture is a critical decision. Here’s how to make the right choice. Monolithic Architecture …
Elasticsearch Cluster Optimization: Performance Tuning and Best Practices
Elasticsearch is a powerful search and analytics engine, but optimizing it for production requires understanding indexing strategies, query patterns, …
SAST + DAST in CI: Quick Wins
Static (SAST) Run linters/semgrep/bandit/gosec/spotbugs per language; fail on high severity. Baseline to reduce noise; allow sarif upload to code host …
Cache Tier Design: Redis vs Memcached
Choosing engine Redis: rich data types, persistence, clustering, scripts; good for queues/rate limits. Memcached: simple KV, pure in-memory, fast; …
Web Security Best Practices: Protecting Your Applications
Security is crucial in web development. Here are essential security practices to protect your applications. 1. Authentication & Authorization Strong …
Kubernetes Deployment Strategies: Rolling Updates, Blue-Green, and Canary
Kubernetes provides several deployment strategies to ensure zero-downtime updates and safe rollouts of new application versions. Understanding these …
Laravel Performance & Caching Playbook (2024)
Low-effort wins php artisan config:cache, route:cache, view:cache; warm on deploy. Enable OPcache with sane limits; preloading for hot classes when …
Node.js Redis Caching Patterns
Keys & TTLs Namespaced keys: app:domain:entity:id. Set TTLs per data volatility; use jitter to avoid thundering expirations. Version keys on schema …
MySQL Optimizer Checklist for PHP Apps
Query hygiene Add composite indexes matching filters/order; avoid leading wildcards. Use EXPLAIN to verify index usage; watch for filesort/temp …
Backend Testing Strategies: Unit, Integration, and E2E Tests
Comprehensive testing is essential for reliable backend systems. Here’s a guide to effective testing strategies. Testing Pyramid /\ / \ E2E Tests …
Node.js + Postgres Performance Tuning
Pooling Use a pool (pg/pgbouncer); size = (CPU * 2–4) per app instance; avoid per-request connections. For PgBouncer in transaction mode, avoid …
Caching for Frontend Performance: Practical Patterns
This note condenses the DEV article “Mastering Frontend Performance: Harnessing the Power of Caching” into actionable steps for modern apps. Why cache …
Hardening gRPC Services in Go
Deadlines & retries Require client deadlines; enforce server-side context with grpc.DeadlineExceeded handling. Configure retry/backoff on idempotent …
Java Class Initialization Order: Understanding the Real Sequence
Understanding Java class initialization order is crucial for avoiding subtle bugs. Here’s the real initialization sequence and common pitfalls. …
Common Failure Modes in Containerized Systems and Prevention
Containerized systems have unique failure modes. Here’s how to identify and prevent common issues. 1. Resource Exhaustion Memory Limits # …
Testing Strategies for CI/CD: Balancing Speed, Depth, and Sanity
Effective testing in CI/CD pipelines requires balancing speed, coverage, and reliability. This guide covers strategies to optimize your testing …
Java Virtual Threads (Loom) for IO-heavy Services
When it shines IO-heavy workloads with many concurrent requests. Simplifies thread-per-request code without callback hell. Great for blocking JDBC …
Hibernate: Fixing 'Object References an Unsaved Transient Instance' Error
The “object references an unsaved transient instance” error is common in Hibernate. Here’s how to fix it. Understanding the Error This error occurs …
2023
15 articles
Java Collections Framework: Complete Guide with Examples
The Java Collections Framework is essential for every Java developer. Here’s a comprehensive guide. Collection Hierarchy Collection ├── List │ ├── …
PHP-FPM Tuning Guide
Process manager modes pm=dynamic for most apps; pm=static only when workload is predictable and memory bounded. Key knobs: pm.max_children, …
Solving the N+1 Problem in Spring Data JPA
The N+1 problem is a common performance issue in JPA. Here’s how to solve it in Spring Data JPA. Understanding N+1 Problem // N+1 queries: 1 for users …
Spring WebFlux: When to Use It and How to Build With It
Spring WebFlux enables reactive programming in Spring. Here’s when and how to use it. When to Use WebFlux Use WebFlux When: High concurrency …
Java Evolution: From Java 8 to Java 25 - Complete Guide
Java has evolved significantly from Java 8 to Java 25. Here’s a comprehensive guide to the major changes. Java 8 (2014) Lambda Expressions …
SOLID Principles Explained with Java Examples
SOLID principles are fundamental to object-oriented design. Here’s how to apply them in Java. S - Single Responsibility Principle Bad class User { …
Java Isn't Verbose - You Are: Writing Concise Java Code
Java is often criticized for verbosity, but modern Java can be concise. Here’s how to write cleaner code. Modern Java Features Records (Java 14+) // …
Web App Performance Metrics and How to Measure Them
This article summarizes the DEV post “Key Performance Metrics for Web Apps and How to Measure Them,” focusing on the most important signals and how to …
Spring Boot Validation: Complete Guide with @Valid and @Validated
Validation is crucial in Spring Boot applications. Here’s a complete guide to using @Valid and @Validated. Basic Validation Dependencies <dependency> …
MongoDB Query Optimization: Finding Bottlenecks and Performance Tuning
MongoDB performance optimization requires a systematic approach to identify bottlenecks, analyze query patterns, and implement effective indexing …
React Performance Optimization: Techniques and Best Practices
Optimizing React applications is crucial for better user experience. Here are proven techniques. 1. Memoization React.memo const ExpensiveComponent = …
Vue 3 Composition API: Complete Guide and Best Practices
Vue 3’s Composition API provides better code organization. Here’s how to use it effectively. Setup import { ref, computed, watch } from 'vue'; export …
JavaScript Closures Explained: Understanding Scope and Memory
Closures are fundamental to JavaScript. Here’s how they work and when to use them. What is a Closure? A closure gives you access to an outer …
CSS Grid vs Flexbox: When to Use Which
CSS Grid and Flexbox serve different purposes. Here’s when to use each. Flexbox Use for One-Dimensional Layouts .navbar { display: flex; …
Docker Best Practices: Building Efficient Images
Building efficient Docker images requires following best practices. Here’s how. 1. Use Multi-Stage Builds # Build stage FROM node:18 AS builder …
2022
12 articles
Redis Caching Strategies: Patterns and Best Practices
Redis is powerful for caching. Here are effective caching strategies. Cache-Aside Pattern async function getUser(id) { // Check cache let user = await …
MongoDB Query Optimization: Indexing and Performance Tips
Optimizing MongoDB queries is essential for performance. Here’s how. Indexing Create Indexes // Single field index db.users.createIndex({ email: 1 }); …
Elasticsearch Basics: Getting Started with Search
Elasticsearch is powerful for search. Here’s how to get started. Basic Operations Create Index await client.indices.create({ index: 'users', body: { …
RabbitMQ Message Queues: Patterns and Implementation
RabbitMQ enables reliable message queuing. Here’s how to use it effectively. Basic Setup Producer const amqp = require('amqplib'); async function …
PostgreSQL Performance Tuning: Optimization Guide
PostgreSQL performance tuning requires understanding configuration and queries. Here’s a guide. Configuration Tuning postgresql.conf # Memory settings …
Python Asyncio Architecture: Event Loops, Tasks, and Futures Explained
Understanding Python’s asyncio architecture is crucial for writing efficient asynchronous code. Here’s a comprehensive guide. Event Loop The event …
Building a Mini Blog with Python and Flask
Learn how to build a simple blog application using Python and Flask. Setup from flask import Flask, render_template, request, redirect, url_for app = …
Rust Ownership: Understanding Memory Safety
Ownership is Rust’s unique feature that ensures memory safety without garbage collection. Ownership Rules Each value has a single owner Only one owner …
Rust Error Handling: Complete Guide with Result and Option
Rust’s error handling is elegant and type-safe. Here’s how to use it effectively. Option Type fn find_user(id: u32) -> Option<String> { if id > 0 { …
Async SQLAlchemy: Best Practices for Async Python Applications
Using SQLAlchemy with async Python requires understanding async patterns. Here’s how. Setup from sqlalchemy.ext.asyncio import create_async_engine, …
Using Rust WebAssembly in React: Performance Optimization
Rust WebAssembly can significantly improve React application performance. Here’s how to integrate it. Setup cargo install wasm-pack wasm-pack build …
Pandas Joins: Complete Guide to Merging DataFrames
Pandas provides powerful tools for joining DataFrames. Here’s a comprehensive guide. Merge Types Inner Join import pandas as pd df1 = …
2021
3 articles
Migrating from Python 2 to Python 3: Complete Guide
Migrating from Python 2 to Python 3 requires careful planning. Here’s a step-by-step guide. Key Differences Print Statement # Python 2 print "Hello" # …
Building Your First Rust HTTP API with Axum
Axum is a modern web framework for Rust. Here’s how to build your first API. Setup [dependencies] axum = "0.7" tokio = { version = "1", features = …
Apache Spark Optimization: Partitioning and Bucketing Guide
Optimizing Spark jobs is crucial for performance. Here’s how to use partitioning and bucketing effectively. Partitioning from pyspark.sql import …