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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.
- Middleware Troubleshooting Guide: Redis vs RabbitMQ vs Kafka A practical middleware troubleshooting guide for developers covering when to reach for Redis, RabbitMQ, or Kafka symptoms first, and which problem patterns usually belong to each tool.
- Redis Memory Usage High: What to Check First A practical Redis memory troubleshooting guide covering which metrics to inspect first, how to find oversized keys, what MEMORY USAGE and MEMORY STATS show, and why TTL mistakes often inflate memory.
- RabbitMQ Queue Keeps Growing: Troubleshooting Guide A practical RabbitMQ queue growth troubleshooting guide covering ready vs unacked messages, consumer throughput, prefetch, queue length limits, and the fastest checks when a queue will not drain.
- Kafka Consumer Lag Increasing: Troubleshooting Guide A practical Kafka consumer lag troubleshooting guide covering what lag usually means, which consumer metrics to check first, and how poll timing, processing speed, and fetch patterns affect lag.
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DevMiddleware Troubleshooting Guide: Redis vs RabbitMQ vs Kafka
A practical middleware troubleshooting guide for developers covering when to reach for Redis, RabbitMQ, or Kafka symptoms first, and which problem patterns usually belong to each tool.
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DevRedis Memory Usage High: What to Check First
A practical Redis memory troubleshooting guide covering which metrics to inspect first, how to find oversized keys, what MEMORY USAGE and MEMORY STATS show, and why TTL mistakes often inflate memory.
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DevRabbitMQ Queue Keeps Growing: Troubleshooting Guide
A practical RabbitMQ queue growth troubleshooting guide covering ready vs unacked messages, consumer throughput, prefetch, queue length limits, and the fastest checks when a queue will not drain.
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DevKafka Consumer Lag Increasing: Troubleshooting Guide
A practical Kafka consumer lag troubleshooting guide covering what lag usually means, which consumer metrics to check first, and how poll timing, processing speed, and fetch patterns affect 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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DevRedis Keys Not Expiring: Common TTL Mistakes and What to Check
A practical Redis TTL troubleshooting guide covering why keys do not expire, how SET and EXPIRE interact, how to verify TTL state, and the most common expiration mistakes.
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DevAbstraction Guide: What Does “Keep the Essence” Actually Mean?
A beginner-friendly guide to what abstraction means, why it helps manage complexity, and how to think about exposing concepts without exposing too much implementation detail.
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DevAdapter Pattern Guide: How Do You Connect Mismatched Interfaces?
A beginner-friendly guide to what the adapter pattern is, why it helps with incompatible interfaces, and why it fits so well with legacy code and external libraries.
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DevCommand Pattern Guide: Why Treat Requests as Objects?
A beginner-friendly guide to what the command pattern is, why turning requests into objects is useful, and how it connects to queues, retries, and undo-like behavior.
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DevComposition vs Inheritance Guide: Which Should You Use More Often?
A beginner-friendly guide to how inheritance and composition differ, why composition is often preferred, and when each approach fits best.
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DevDecorator Pattern Guide: How Do You Add Behavior by Wrapping an Object?
A beginner-friendly guide to what the decorator pattern is, why it is often preferred over inheritance for add-on behavior, and when it fits well.
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DevDependency Injection Guide: Why Does DI Help with Testing and Change?
A beginner-friendly guide to what dependency injection is, how it reduces coupling, and why it is so often discussed alongside SOLID and object-oriented design.
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DevDIP Guide: Why Does the Dependency Inversion Principle Matter?
A beginner-friendly guide to what DIP means, why depending on abstractions helps with change and testing, and how DIP relates to dependency injection.
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DevEncapsulation Guide: What Should an Object Hide and What Should It Expose?
A beginner-friendly guide to what encapsulation really means, why it is more than private fields, and how it helps objects protect their own rules and state.
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DevFactory Pattern Guide: Why Should Object Creation Be Separated?
A beginner-friendly guide to what the factory pattern is, why object creation can increase coupling, and how separating creation responsibility improves design.
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DevInterface vs Abstract Class Guide: When Should You Use Each?
A beginner-friendly guide to how interfaces and abstract classes differ, when each fits best, and how to choose between role contracts and shared implementation.
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DevISP Guide: Why Does the Interface Segregation Principle Matter?
A beginner-friendly guide to what ISP means, why oversized interfaces create pain, and why role-focused interfaces are often more flexible.
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DevLSP Guide: Why Is the Liskov Substitution Principle Tricky?
A beginner-friendly guide to what LSP means, why inheritance can go wrong, and why subtypes should remain safe replacements for their base types.
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DevObject-Oriented Programming Guide: What Is OOP Really Trying to Solve?
A beginner-friendly guide to what object-oriented programming is, why it exists, and why responsibility and collaboration matter more than class syntax alone.
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DevObserver Pattern Guide: How Do You Loosely Connect Change Notifications?
A beginner-friendly guide to what the observer pattern is, why it is useful for change notification flows, and how it relates to event-style thinking.
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DevOCP Guide: How Should You Understand the Open-Closed Principle?
A beginner-friendly guide to what OCP means, why extension-friendly design matters, and how to think about change without overcomplicating your code.
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DevPolymorphism Guide: What Does “Same Message, Different Behavior” Really Mean?
A beginner-friendly guide to what polymorphism means, why it helps reduce branching, and how it supports more extensible object-oriented designs.
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DevRepository Pattern Guide: Why Put a Layer Around Data Access?
A beginner-friendly guide to what the repository pattern is, why teams separate data access from domain logic, and when the pattern is helpful or excessive.
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DevSOLID Guide: Why Do Object-Oriented Design Principles Matter?
A beginner-friendly guide to what SOLID means, how to think about each principle, and why these ideas help with maintainability and change.
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DevSRP Guide: Why Does the Single Responsibility Principle Matter?
A beginner-friendly guide to what SRP means, why classes that change for too many reasons become painful, and how to think about responsibility boundaries.
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DevStrategy Pattern Guide: How Do You Change Behavior Without Growing Conditionals?
A beginner-friendly guide to what the strategy pattern is, why it helps reduce large conditionals, and how it connects to polymorphism and SOLID.
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DevTemplate Method Pattern Guide: How Do You Keep the Flow but Change Some Steps?
A beginner-friendly guide to what the template method pattern is, when it fits well, and how it keeps a shared algorithm structure while allowing step-level variation.
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DevBlocking vs Non-Blocking Guide: How It Differs from Sync and Async
A beginner-friendly guide to what blocking and non-blocking mean, why they are different from synchronous and asynchronous execution, and how to think about when control returns to the caller.
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DevConcurrency vs Parallelism Guide: Handling Many Tasks Is Not the Same as Running Them at the Same Time
A beginner-friendly guide to what concurrency and parallelism mean, how they relate to asynchronous execution, and how to distinguish overlapping task handling from true simultaneous execution.
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DevEvent Loop Guide: How JavaScript Async Execution Actually Runs
A beginner-friendly guide to what the event loop is, how the call stack and queues work, and why asynchronous JavaScript code runs in the order it does.
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DevPromise and async/await Guide: How to Read JavaScript Async Code
A beginner-friendly guide to what Promise is, why async/await exists, how it differs from callbacks, and how to read JavaScript asynchronous code more clearly.
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DevSynchronous vs Asynchronous Guide: The First Concept to Learn Clearly
A beginner-friendly guide to what synchronous and asynchronous execution mean, how waiting differs between them, and why asynchronous does not automatically mean faster.
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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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DevWhat Is a Queue Data Structure? FIFO, Examples, and Use Cases
A practical guide to queue data structures covering FIFO behavior, core operations, BFS and job queue examples, and when queues fit real systems.
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DevWhat Is a Sorted Set? Redis ZSET, Rankings, and Scheduling
A practical guide to sorted sets covering how they differ from regular sets, how Redis ZSET works, and why sorted sets fit rankings and scheduled jobs.
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DevWhat Is a Stack Data Structure? LIFO, Examples, and Use Cases
A practical guide to stack data structures covering LIFO behavior, push and pop, bracket matching, undo flows, DFS, and call stack intuition.
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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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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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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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DevRabbitMQ Messages Stuck in unacked: Why It Happens and What to Check
A practical RabbitMQ troubleshooting guide covering why messages stay in unacked, how manual acknowledgements and prefetch work, and what to inspect before you blame the broker.
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DevKafka Messages Not Consumed: What to Check First
A practical Kafka troubleshooting guide covering consumer group state, poll behavior, partition assignment, offsets, and the first checks when messages are produced but not consumed.
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DevRabbitMQ Connection Blocked: Common Causes and Fixes
A practical RabbitMQ troubleshooting guide covering memory alarms, disk alarms, flow control, blocked connection notifications, and what to inspect when publishers stop making progress.
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DevRabbitMQ Consumers Not Receiving Messages: What to Check
A practical RabbitMQ troubleshooting guide covering queue existence, bindings, consumer activity, prefetch, and why consumers can stay connected but stop receiving messages.
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DevRedis Connection Refused: Common Causes and Fixes
A practical Redis connection troubleshooting guide covering bind and protected mode issues, port checks, container networking mistakes, and the fastest way to debug connection refused errors.
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DevRedis Eviction Policy Guide: Why Keys Disappear
A practical Redis eviction troubleshooting guide covering maxmemory, policy behavior, volatile vs allkeys, write failures, and how to decide whether missing keys are eviction, expiration, or application behavior.
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DevRedis Latency Spikes: What to Check First
A practical Redis latency troubleshooting guide covering slow commands, intrinsic latency, latency monitor, networking, swapping, and persistence-related spikes.
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DevRedis OOM Command Not Allowed: Why It Happens and What to Check
A practical Redis OOM troubleshooting guide covering maxmemory, eviction policy, write failures under pressure, big keys, and why OOM errors do not always mean the process is out of RAM.
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DevRedis Persistence Latency: RDB, AOF, and What to Check
A practical Redis persistence latency guide covering how RDB and AOF can affect latency, what to inspect first, and how to separate persistence impact from command-level slowness.
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DevRedis Slowlog Guide: How to Find Slow Commands First
A practical Redis SLOWLOG troubleshooting guide covering how to find slow commands, how SLOWLOG differs from network latency, and what to inspect before changing server settings.
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DevRabbitMQ Dead Letter Exchange Guide: What to Check First
A practical RabbitMQ dead letter exchange guide covering dead-letter triggers, policy vs x-arguments, routing expectations, and why messages do not always land where teams expect.
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DevRabbitMQ Prefetch Guide: Why Throughput Feels Wrong
A practical RabbitMQ prefetch guide covering what prefetch really limits, how it affects unacked messages and consumer throughput, and why a higher value is not always better.
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DevRabbitMQ Publisher Confirms Guide: What They Actually Guarantee
A practical RabbitMQ publisher confirms guide covering what confirms prove, what they do not prove, and how to debug false assumptions around publish safety and delivery guarantees.
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DevRabbitMQ Quorum Queues Guide: When They Fit and When They Hurt
A practical RabbitMQ quorum queues guide covering when quorum queues are a good fit, how they differ operationally from classic queues, and what tradeoffs matter before migration.
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DevKafka Leader Imbalance: Why Some Brokers Stay Hot
A practical Kafka operations guide covering leader imbalance, preferred replicas, broker restarts, and what to inspect when some brokers stay hotter than the rest.
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DevKafka max.poll.interval.ms Troubleshooting: What to Check
A practical Kafka consumer troubleshooting guide covering max.poll.interval.ms, slow handlers, rebalance loops, and what to inspect when consumers look alive but keep falling out of the group.
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DevKafka Rebalancing Too Often: Common Causes and Fixes
A practical Kafka troubleshooting guide covering why consumer groups rebalance too often, what poll timing and group protocol settings matter, and how to stop rebalances from interrupting useful work.
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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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DevKafka Producer Retries Guide: What Rising Retries Usually Mean
A practical Kafka producer retries guide covering what rising retry counts usually indicate, how to think about delivery.timeout.ms and timing, and when retries point to broker pressure rather than client bugs.
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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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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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Dev10 Common Vercel Deployment Failures: A Checklist for "Works Locally, Breaks in Production"
A practical checklist for narrowing down Vercel deployment failures fast, from environment variables and Node versions to build logs, runtime errors, asset paths, and DNS.
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DevRedis Big Keys Guide: Why Oversized Keys Become Operational Problems
A practical Redis big keys guide covering how to find oversized keys, why they create memory and latency pain, and what structural fixes usually work better than one-off cleanup.
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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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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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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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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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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.
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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 Deploy a Frontend Project Fast
A practical Vercel deployment guide covering framework detection, environment variables, preview deployments, domains, and the checks that matter most before and after production deploys.