Heitech

Full stack. Built to last.

What I build

Production software across TypeScript, Go, Python, Swift, Dart, and PHP. Specialized in autonomous AI systems and high-throughput infrastructure.

AI-Augmented Engineering

Multi-agent orchestration, self-healing code loops, and autonomous software that interacts reliably with messy real-world systems.

Resilient Backend Systems

Real-time data infrastructure, high-concurrency pipelines, and APIs hardened against the edge cases that surface under production load.

Cross-Platform Products

End-to-end products shipped across native macOS (Swift), mobile (Flutter), and modern web (Next.js, Vue, Astro).

How I work

I ship production systems across stacks chosen for the problem, not preference. Go and PostgreSQL when concurrency matters. Swift or Flutter when the product belongs on a device. Next.js, Vue, or Astro when the web is the right fit.

Heavy use of AI-augmented workflows lets me move fast without cutting corners: multi-agent orchestration in my own tooling, careful prompting and review in client work.

I write code meant to outlast the contract. Systems I shipped years back are still in production today, still serving customers, and still maintained by me.

Selected work

A small selection across personal projects, collaborations, and long-term partnerships. Plenty more in personal repos and client work, available on request.

Collaboration · In development

GigCloser

Autonomous Upwork agent

A supervised AI workflow for Upwork prospecting and client communication. The stateful agent stores jobs, outreach, conversations, decisions, and preferences in SQL, retrieves relevant context before generating proposals or replies, and keeps a human operator in the loop through Telegram.

Next.jsTypeScriptLLM orchestrationRAG

Long-term Project · 2022 → today

Orpheus

Event ticketing & management

Full-stack ticketing platform for a Danish party committee I'm a part of (CVR-registered). QR-code entry validation, real-time attendance, and a custom Webflow to PHP compiler that turns static designs into a dynamic backend. Still hosted and maintained by me. A multi-tenant rewrite is in active development under ticketsystem.

PHPTypeScriptSQLCustom Compiler

Co-founded · Music label

AGGR Music

Independent record label

Co-founded an independent music label with my brother. We sign artists, produce releases, and distribute through major streaming platforms. I built the Astro marketing site and the surrounding production tooling.

AstroTailwindTypeScript

Collaboration

MusicFix

Artist booking & studio rental marketplace

Marketplace for booking DJs and artists for events and renting music studios. Enhanced the production Flutter iOS/Android app, then built the Next.js web platform from scratch on a Firebase backend with strict Firestore rules, Cloud Functions, and Stripe.

FlutterNext.jsFirebaseStripe

Open Source · macOS Utility

ChargeControl

Native macOS battery limiter

Swift utility that caps charging to extend battery life. System sounds, plist configuration, and an automated release-notes pipeline, distributed through a dedicated Homebrew tap. Latest release: v1.1.0.

SwiftmacOSHomebrew

Open Source · Python Package

aioeloverblik

Async wrapper for the Danish energy API

Modern typed async Python wrapper for the Eloverblik energy data API, replacing an abandoned legacy library. Built with httpx and Pydantic, released on PyPI, and supporting both Customer and Third-Party API scopes as well as a companion Home Assistant component.

PythonasynciohttpxPydantic

Let's Connect

Tell me what you're building. I'll reply with how I'd approach it and what it would take.

William Hein

William Hein

Founder & Lead Developer

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