Retro Amsterdam canal scene during the day
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Steven Kleinveld

Founder of Skylark, the AI studio behind Marnix.ai

I design, build, and ship products.

Skylark is my AI studio, with Marnix.ai as its flagship voice-to-code product. Suite Browser is the spatial software bet. I care about the whole thing: idea, interface, launch, and whether people can actually use it.

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The backstory

Every app has a reason it exists.

The portfolio should show the shipped product and the path that made it happen. These stories are the personal part of the work.

Skylark / Marnix.ai iconSkylark / Marnix.aiHow the AI studio became a voice-to-code platform.Read story
Suite Browser iconSuite BrowserWhy the emptiest App Store in tech might be the biggest opportunityRead story
Drip iconDripThe code got easy. The icon, the screenshots, and the listing did not.Read story
Runway iconRunwayAn ode to founders, built as a game and meant as a mirror.Read story
Kakker iconKakkerA love letter to Amsterdam's poshest stereotype, wrapped in a drinking game.Read story
Volendam iconVolendamA dialect app born from fascination, because not every app needs to make money.Read story

Shipped around the edges

Smaller apps, fast experiments, useful tools.

Drip icon

Drip

From code to App Store listing. Icon generation, screenshots, and launch assets.

Founder Runway icon

Founder Runway

A startup survival runner about dodging bills, collecting MRR, and staying alive.

Kakker icon

Kakker

A Dutch party game with regional humor, drinking games, and a leveling loop.

Volendam icon

Volendam

A dialect learning app for preserving local language through quizzes and translation.

Writing on Marnix

A few notes live with the product.

Longer founder notes belong on the Marnix site, where the product context is already present.

Great output isn't big moves. It's the lunches.A note from a day inside a small YC-backed team, and what stuck about output, taste, and intent.
The one-person startup.Five concrete pipelines, one honest mistake, and what solo builders should automate before hiring.
More on the Marnix blogThe longer notes live with the product, where the work and the thinking are connected.

quietly open

If the work makes you want to build something, reach out.

Most of this page is here to show the products. This is just the small door at the end.

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