Available for select engagements · Hamburg, Germany

Senior web engineer crafting fast, resilient products on the modern web.

I'm Theodor Bajusz — a full-stack engineer with deep specialization in web performance, browser internals and edge infrastructure. I help teams ship interfaces that feel instant and stay that way at scale.

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  • 0+ years shipping production code
  • 0+ large e-commerce sites optimized
01

About

Photograph of Theodor Bajusz

Hi — I'm Theodor. I build for the web because I love the constraints: every millisecond of latency, every kilobyte over the wire, every re-render is a puzzle worth solving.

Most of my career has been spent at the boundary between frontend craft and infrastructure — the place where a clever architectural choice quietly saves a million users a second of waiting. I've reverse-engineered bottlenecks on large e-commerce sites, built speculative-loading and SSR features as core product, and shipped internal tooling that turns firefighting into routine.

Outside the editor I tinker with cars, bikes and electronics — the same instinct: take it apart, understand it, leave it running better than I found it.

  • Based inHamburg, DE
  • Open toRemote · Switzerland · EU contracts
  • WritingEN · DE · RS · HU
02

What I do

A senior generalist with a performance specialization. The four lanes I keep returning to.

Full-stack engineering

End-to-end product work: TypeScript on both sides, REST/GraphQL, Postgres schemas, queue-driven workflows. I prefer boring technology and small surfaces.

  • TypeScript
  • Node.js
  • React
  • Go
  • Postgres

Web performance

Core Web Vitals as a product feature. RUM-driven optimization of LCP, INP and CLS, hydration cost, render-blocking analysis, long-task surgery — and the tooling to keep it that way.

  • Core Web Vitals
  • Lighthouse
  • RUM
  • SSR / DSD
  • Speculation Rules

Edge & infrastructure

CDN-native architectures, Service Workers, edge caching strategy and zero-downtime deploys. I'm comfortable with cloud primitives but skeptical of unnecessary complexity.

  • Cloudflare
  • AWS
  • k8s
  • Service Workers
  • Cache strategy

Tooling & DX

Internal tools that turn a 20-step manual checklist into a single command. Better diagnostics. Faster CI. Fewer footguns. Code people enjoy contributing to.

  • CI/CD
  • Observability
  • CLIs
  • Static analysis
  • Testing
03

Experience

A short version. The full résumé: English · Deutsch.

    04

    Projects

    A mix of open source, work and side experiments. More on the way.

    05

    Writing

    Notes on performance, architecture and the occasional rabbit hole.

    06

    Let's build something fast.

    Got an interesting performance problem, an ambitious greenfield project, or just want to compare notes on the modern web? The inbox is open.