Frontend
Hire JavaScript Developers
JavaScript and TypeScript engineers who work across browser and server rather than inside one framework.
The strongest argument for JavaScript is not any single framework but the fact that one language covers both ends of a product. Sazinga AdBoard, Factory, Rentals and Comply all share types between their TypeScript services and their front ends, so a change to an API contract fails at compile time rather than in someone’s browser three weeks later.
When hiring, treat framework labels as secondary. Ask how a candidate would type an API response that has three legitimate shapes, what they do about a Node process whose memory keeps climbing, and why a bundle grew. Engineers with genuine language depth move between React, Angular and a server codebase in the same week. Framework specialists often cannot.
What these engineers do
- TypeScript 5.x in strict mode, with discriminated unions and generics used well
- Modern browser APIs, ES modules and bundling with Vite, esbuild or Rollup
- Node runtime behaviour - event loop, streams, backpressure and memory profiling
- Monorepos with pnpm workspaces, Turborepo and types shared across client and server
- Testing with Vitest and Playwright wired into CI rather than run by hand
Delivered AI-first
AI assistance is used for type modelling and migration work, which is where JavaScript projects lose the most time - adding strict types to an untyped module, generating types from an API contract, converting CommonJS to ES modules, and writing the test cases that make such a change safe to merge. The compiler and the test suite decide whether the result is correct, not the assistant. Review discipline is unchanged. The measurable effect is throughput per engineer, not fewer reviews.
Built with JavaScript at Sazinga
These are our own production applications, not client references — which is why the engineers have operated them, not just written them.