Senior Frontend Engineer at Geizhals · Vienna

Full stack engineering, AI-assisted, built to last.

Twelve years building and maintaining web applications, full stack in TypeScript/Svelte and PHP/Laravel, with an AI-assisted workflow inside a decade-old production codebase.

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Currently working on

(07)

2026TherapeutensucheMy own directory for finding therapists in Austria — by specialty, location and availability, free for the people searching and for the practitioners listed.Laravel · SvelteKit 2019GeizhalsFrontend architecture for one of Austria's largest price comparison platforms, migrating incrementally from Preact to Svelte 5 and SvelteKit.Svelte · SvelteKit 2016DATUMA WordPress site on the Roots stack with a custom, accessible paywall for online articles and magazine issues, backed by Mollie.WordPress · Laravel 2024DATUM StiftungA multilingual foundation site on the same Roots stack, extended with WPML and a Mollie donation form supporting recurring subscriptions.WordPress · Laravel 2022coaching-psychotherapie.atPractice site for a Viennese behavioural therapist and business coach, on a custom Roots-stack theme she can run herself.WordPress · Bedrock 2019autofilouAustrian car and motorcycle reviews on a custom Roots-stack theme, with a model database behind the editorial that drives comparison and brand listings.WordPress · Bedrock 2019psychotherapie-zimmermann.atPractice site for a systemic psychotherapist in Vienna, from the four kinds of therapy on offer down to where to park.WordPress · Bedrock

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About

Portfolio of Marc Heiduk — full stack engineer in Vienna, working on AI-assisted development, component architecture, build tooling and legacy modernization for web applications that have to last.

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Have something worth building?

marc@heiduk.me