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Browse developer-focused guides covering coding tools, deployment, backend setup, and practical Redis, RabbitMQ, and Kafka troubleshooting.
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Start With Middleware Troubleshooting
Use the hub to identify the right system first, then jump into Redis, RabbitMQ, or Kafka symptom-specific guides.
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DevMiddleware Troubleshooting Guide: Where to Start With Redis, RabbitMQ, or Kafka
A practical middleware troubleshooting hub covering how to choose the right first branch when systems using Redis, RabbitMQ, and Kafka show cache drift, queue backlog, or consumer lag.
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DevWhat Is Google Stitch? A Practical Guide to Google's AI UI Design Tool
A practical Google Stitch guide covering what Stitch is, how prompt-to-UI works, what Figma and frontend export look like, and where the tool fits in a real design workflow.
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DevKafka Producer Retries: Read Timing and Guarantees Before Lowering the Number
A practical Kafka producer retries guide covering `delivery.timeout.ms`, `request.timeout.ms`, `acks`, `enable.idempotence`, `max.in.flight.requests.per.connection`, and why rising retries usually mean the delivery path slowed down before the client became the problem.
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DevKafka Leader Imbalance: Count Leaders Before Adding Brokers
A practical Kafka leader imbalance guide covering preferred replicas, `auto.leader.rebalance.enable`, `leader.imbalance.check.interval.seconds`, `leader.imbalance.per.broker.percentage`, and why restarted brokers often come back cool while other brokers stay hot.
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DevOpenAI Codex CLI Setup Guide: Install, Auth, and Your First Task
A practical OpenAI Codex CLI setup guide covering installation, sign-in, the first interactive run, Windows notes, and the safest workflow for your first real task.
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DevClaude Code Setup Guide: Install, Permissions, and Your First Workflow
A practical Claude Code setup guide covering installation, authentication, permission pitfalls, verification commands, and the best first workflow for a new repository.
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DevStrategy Pattern Guide: How to Replace Growing Conditionals With Swappable Behavior
A practical guide to the strategy pattern covering when to use it, how it helps with large conditionals, and how to refactor behavior into replaceable policies.
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DevSOLID Guide: How to Use the Five Principles Without Memorizing Them
A practical guide to SOLID covering what each principle protects, common overuse mistakes, and how SRP, OCP, LSP, ISP, and DIP work together in real design.
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DevObserver Pattern Guide: How to React to State Changes Without Tight Coupling
A practical guide to the observer pattern covering how change notifications work, why it helps reduce coupling, and where observer fits well or becomes hard to manage.
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DevObject-Oriented Programming Guide: How OOP Organizes Responsibility and Change
A practical guide to object-oriented programming covering what OOP is really for, when it helps, common misunderstandings, and how OOP connects to SOLID.
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DevFactory Pattern Guide: Why Object Creation Deserves Its Own Design
A practical guide to the factory pattern covering why object creation increases coupling, how factories help centralize creation rules, and when a factory is useful or unnecessary.
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DevCommand Pattern Guide: Why Packaging Requests Helps Queues, Retries, and Undo
A practical guide to the command pattern covering why requests are turned into objects, how that helps with queues and retries, and when the pattern is useful or unnecessary.
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DevComposition vs Inheritance: How to Choose Flexible Collaboration Over Fragile Hierarchies
A practical guide to composition vs inheritance covering how they differ, when inheritance fits, when composition is safer, and a refactoring example you can reuse.
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DevPromise and async/await Guide: How to Read JavaScript Async Code Clearly
A practical beginner-friendly guide to what Promise is, why async/await exists, how it differs from callbacks, and how to read and structure asynchronous JavaScript more clearly.
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DevEvent Loop Guide: How JavaScript Async Code Actually Gets Scheduled
A practical beginner-friendly guide to what the event loop is, how the call stack, task queue, and microtasks work, and why Promise callbacks run differently from setTimeout.
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DevConcurrency vs Parallelism Guide: Handling Many Tasks Is Not the Same as Running Them at Once
A practical beginner-friendly guide to what concurrency and parallelism mean, how they relate to asynchronous execution, and how to separate overlapping progress from true simultaneous execution.
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DevHarness Engineering Guide: Why Evals Matter More Than Prompt Tweaks
A practical harness engineering guide covering what a harness is, why evals become critical as LLM systems get more capable, and how product teams can build safer iteration loops.
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DevSupabase RLS Policy Examples for Beginners: Read, Insert, Update, and Delete
A practical Supabase RLS policy guide for beginners covering how to enable RLS, how auth.uid() works, and example policies for select, insert, update, and delete.
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DevRedis OOM Command Not Allowed: Check `maxmemory` and Eviction Candidates First
A practical Redis OOM troubleshooting guide covering `maxmemory`, `maxmemory-policy`, `mem_not_counted_for_evict`, why `volatile-*` can behave like `noeviction`, and how to separate policy failure from raw capacity problems.
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DevRabbitMQ Quorum Queues: Choose Them for Failure Behavior, Not as a Default Upgrade
A practical RabbitMQ quorum queue guide covering replicated durability, RabbitMQ 4.0+ delivery limits, `x-delivery-count`, at-least-once dead-lettering, feature gaps versus classic queues, and when quorum queues solve the right problem.
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DevRabbitMQ Dead Letter Exchange: Confirm the Trigger Before the Route
A practical RabbitMQ DLX guide covering the four dead-letter triggers, policy versus `x-arguments`, `x-death` headers, dead-letter cycles, and why messages often disappear before the team checks the real trigger.
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Dev10 Common Vercel Deployment Failures: A Checklist for "Works Locally, Breaks in Production"
A practical recovery guide for Vercel deployment failures. Learn how to separate build failures from runtime and domain issues, use environment variables correctly, inspect runtime logs, and recover quickly with rollback when production breaks.
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DevHow to Build Better Frontends with GPT-5.4: Practical Prompt Rules from OpenAI
A practical take on OpenAI’s Designing delightful frontends with GPT-5.4. Review why lower reasoning can work better, when to define a design system first, how to use visual references, and why Playwright-based checking matters.
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DevOpenAI Codex Guide for Software Engineers: What It Is and How to Use It
A practical OpenAI Codex guide for software engineers covering what Codex is, how the CLI, App, and IDE differ, where Codex works best, and the most common adoption mistakes.
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DevRedis Big Keys: Why `--bigkeys` and `--memkeys` Should Be Used Together
A practical Redis big keys guide covering how to separate element-heavy keys from memory-heavy keys, when to use `--bigkeys`, `--memkeys`, and `MEMORY USAGE`, and why structural fixes beat one-off cleanup.
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DevClaude Code vs Cursor vs Codex: Which AI Coding Tool Fits Your Workflow?
A practical comparison of Claude Code, Cursor, and Codex across editor speed, terminal delegation, repository exploration, review-heavy work, and team workflow fit.
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DevCodex Workflow Guide: How to Start AI-Driven Development
A practical Codex workflow guide covering how to use Codex with editor tools, what AI-driven development looks like in practice, and the most common mistakes to avoid.
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DevWhat Is gstack? A Hands-On Review of Garry Tan's AI Coding Workflow
A hands-on gstack review covering what it is, how setup works, what the planning and QA flow feels like, and who should use it instead of relying on direct prompting alone.
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DevClaude Code Skills Guide: How to Build Reusable Skills That Actually Help
A practical Claude Code Skills guide covering what skills are, which kinds create the most value, how to design reusable skills, and the most common mistakes to avoid.
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DevClaude Code Review: What It Is, Where It Fits, and How to Use It Well
A practical Claude Code review covering what it is, where it works best, how it compares to editor-first tools, and the most common mistakes to avoid.
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DevSSR vs CSR Guide: Which Rendering Model Fits Your Frontend Project?
A practical SSR vs CSR guide for frontend developers. Compare SEO, first load, hosting cost, developer complexity, and when Next.js, Vite, or Astro make the most sense.
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DevTypeScript Beginner Guide: How JavaScript Developers Should Start
A practical TypeScript beginner guide for JavaScript developers covering what to learn first, how to reduce any usage, when to trust inference, and which habits improve maintainability fastest.
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DevVercel Deployment Guide: How to Ship an Astro or Frontend Project Without Surprises
A practical Vercel deployment guide covering static Astro defaults, when you need the Vercel adapter, preview versus production environments, environment variables, custom domains, and the verification loop that makes a deploy actually production-ready.
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DevSupabase Beginner Guide: Auth, RLS, and Database Setup
A practical Supabase beginner guide covering Auth, PostgreSQL tables, RLS, API keys, and the setup decisions that matter most for side projects and small product teams.