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In-depth technical deep dives from the H4Tech team — the history, context, and engineering behind the tools we build with.

The NestJS Story

From a Solo Weekend Project to the Framework That Brought Structure to Node.js

NestJS was built by one developer over a weekend in 2017 — not to disrupt the Node.js ecosystem, but to solve a personal problem: building scalable server-side applications without the organisational chaos of Express alone. This paper traces the full arc: the structural vacuum Express left behind, the Angular blueprint of dependency injection and decorators, the core architecture of modules, controllers, providers and the request pipeline, the TypeScript bet that proved prescient, the first-party @nestjs/* ecosystem, production adoption at GitLab, Adidas and financial services, the Express-vs-Fastify performance question, and where the framework is heading as AI-powered backends become the defining challenge of server-side development.

Aug 2, 2026 · Version 1.0 · 15 pages

NestJSNode.jsTypeScriptDependency InjectionBackend Architecture

Short on time? Read the one-page version

The React Native Story

From a Facebook Hack Week Experiment to the World's Most Deployed Cross-Platform Mobile Framework

React Native began as a two-week internal hackathon at Facebook in 2013 — not a product plan, but a question: could you build truly native mobile apps with the same mental model as React on the web? This paper traces the full arc: the pain of dual-platform mobile development before 2015, the Bridge architecture and its performance ceiling, the Airbnb sunset and Facebook's re-commitment, Expo's role in democratising the developer experience, and the New Architecture — JSI, Fabric, and TurboModules — that now underpins the framework. Written for developers and engineering leaders who want the historical and technical context behind one of the most consequential decisions in mobile development.

Aug 2, 2026 · Version 1.0 · 13 pages

React NativeMobileExpoJSIFabricCross-Platform

Short on time? Read the one-page version

Deploying Python APIs on Fly.io

Django REST Framework & FastAPI with PostgreSQL and Redis

A practical guide for developers and DevOps engineers seeking production-grade cloud deployments without the operational overhead of AWS or GCP. Covers the Fly.io platform (Firecracker micro-VMs, private WireGuard networking, the fly.toml contract), a cost and complexity comparison against AWS ECS/RDS and GCP Cloud Run, and production-ready configuration for Django DRF and FastAPI — including Dockerfiles, PostgreSQL provisioning, Redis, Celery, secrets, scaling, and a full launch checklist.

Jul 1, 2026 · Version 1.0 · 27 pages

Fly.ioDjangoFastAPIPostgreSQLRedisDevOps

The JavaScript & ECMAScript Story

From a Ten-Day Hack in 1995 to the Language That Powers the Modern Web

JavaScript was written in ten days in 1995 by a single engineer at Netscape. Today it runs in every browser, on servers, on mobile, and at the edge. This paper traces the full arc — the browser wars and the birth of ECMAScript, the ES4 collapse, the transformative ES6 release, the rise of TypeScript, and the runtimes and frameworks that turned a form-validation script into the infrastructure of the modern internet. Written for developers at any level who want the historical and technical context behind the tools they use every day.

Jul 4, 2026 · Version 1.0 · 17 pages

JavaScriptECMAScriptTypeScriptWeb History

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