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Engineering insights from H4Tech

Real-world solutions and hard-earned lessons on AI, agents, and software — in our articles, in-depth white papers, one-page tech cards, and open-source repositories.

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Long-form technical deep dives — the history, context, and engineering behind the tools we build with.

The NestJS Story

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 · v1.0 · 15 pages

The React Native Story

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 · v1.0 · 13 pages

Tech cards

One page, one decision

The case for the technologies we build with, compared side by side with the alternatives — read it here or share the PDF.

First page of the Why NestJS? one-pager

Why NestJS?

The case for NestJS over other Node.js web frameworks and backend solutions

NestJSNode.jsTypeScriptDependency InjectionBackend Architecture
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Repositories

Code you can build on

Reference implementations and open-source projects that accompany the articles.

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