18 Guides · Practical, In-Depth, Free

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Practical, in-depth guides built from real project experience — not theory. Architecture decisions, production patterns, and everything we wish we'd known when we started.

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The Complete Next.js Project Setup Guide
FrontendIntermediate
20 min read·12 pages·Updated Jun 2025

The Complete Next.js Project Setup Guide

From zero to production — every configuration, optimisation, and best practice we use when starting a new Next.js project at CODX.

Project StructureTypeScript SetupRouting & LayoutsData FetchingAuth IntegrationDeployment
2.4K downloads
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Building Scalable APIs with FastAPI
BackendIntermediate
25 min read·15 pages·Updated May 2025

Building Scalable APIs with FastAPI

A comprehensive guide to designing, building, and deploying FastAPI applications — from project structure to async patterns and production hardening.

Project StructureAsync PatternsDB IntegrationAuth & SecurityTestingDeployment
1.8K downloads
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RAG Pipelines from Scratch
AI/MLAdvanced
35 min read·20 pages·Updated Jun 2025

RAG Pipelines from Scratch

Build a production-grade retrieval-augmented generation pipeline from the ground up — embedding, vector search, prompt engineering, and evaluation.

Embedding ModelsVector StoresChunking StrategiesPrompt DesignEvaluationMonitoring
3.1K downloads
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10 guides
Flutter Cross-Platform Mastery
MobileIntermediate
30 min read·18 pages·Updated Apr 2025

Flutter Cross-Platform Mastery

Everything you need to build production Flutter apps — state management, platform channels, animations, and app store deployment.

Widget ArchitectureState ManagementNavigation+3
1.5K downloads
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Docker & Kubernetes for Web Developers
DevOpsBeginner
25 min read·14 pages·Updated May 2025

Docker & Kubernetes for Web Developers

Stop fighting infrastructure. A practical guide to containerising web applications and orchestrating them with Kubernetes — no DevOps background required.

Docker BasicsDocker ComposeK8s Concepts+3
2.8K downloads
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TypeScript Design Patterns for React
FrontendAdvanced
22 min read·13 pages·Updated Apr 2025

TypeScript Design Patterns for React

Advanced TypeScript patterns that make React code safer, more readable, and a joy to maintain — generic components, discriminated unions, and more.

Generics in ReactDiscriminated UnionsTemplate Literals+3
2.1K downloads
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PostgreSQL Performance Tuning
BackendAdvanced
28 min read·16 pages·Updated Mar 2025

PostgreSQL Performance Tuning

Make your PostgreSQL queries fly — indexing strategies, query planning, vacuuming, connection pooling, and the configuration changes that matter most.

Index StrategiesQuery PlanningConfiguration+3
1.9K downloads
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Introduction to AI Agents with LangChain
AI/MLBeginner
20 min read·11 pages·Updated Jun 2025

Introduction to AI Agents with LangChain

A beginner-friendly guide to building autonomous AI agents — tool use, memory, multi-agent coordination, and production deployment considerations.

Agent ConceptsTool DefinitionsMemory Systems+3
3.5K downloads
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React Native Performance Optimisation
MobileIntermediate
18 min read·10 pages·Updated Feb 2025

React Native Performance Optimisation

Practical techniques for keeping React Native apps smooth — JS thread optimisation, native modules, image caching, and profiling tools.

JS ThreadNative ModulesImage Optimisation+3
1.2K downloads
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CI/CD Pipelines with GitHub Actions
DevOpsBeginner
15 min read·9 pages·Updated Jan 2025

CI/CD Pipelines with GitHub Actions

Automate everything — testing, linting, building, deploying. A complete guide to GitHub Actions workflows for modern web projects.

Workflow BasicsTestingCaching+3
2.6K downloads
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3 guides

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Intermediate

4 guides

You know the basics and want to level up. Practical patterns and real-world architecture decisions.

Advanced

3 guides

For experienced engineers. Deep dives into performance, scaling, and production-hardened patterns.

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