Senior Frontend Engineer at Geizhals · Vienna

I build web frontends that outlive their rewrites.

Over ten years of building and maintaining web applications, from high-traffic consumer platforms to editorial publishing sites.

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Currently working on

(07)

2026–nowTherapeutensucheMy own directory for finding therapists in Austria — by specialty, location and availability, free for the people searching and for the practitioners listed.Laravel · SvelteKit 2019–nowGeizhalsFrontend architecture for one of Austria's largest price comparison platforms, migrating incrementally from Preact to Svelte 5 and SvelteKit.Svelte · SvelteKit 2016–nowDATUMA WordPress site on the Roots stack with a custom, accessible paywall for online articles and magazine issues, backed by Mollie.WordPress · Laravel 2024–nowDATUM StiftungA multilingual foundation site on the same Roots stack, extended with WPML and a Mollie donation form supporting recurring subscriptions.WordPress · Laravel 2022–nowcoaching-psychotherapie.atPractice site for a Viennese behavioural therapist and business coach, on a custom Roots-stack theme she can run herself.WordPress · Bedrock 2019–nowautofilouAustrian 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 2019–nowpsychotherapie-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 — senior frontend engineer in Vienna, working on component architecture, build tooling, accessibility and performance for web applications that have to last.

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Let's talk

Have something worth building?

marc@heiduk.me