For developers
Etesie and my Svelte + Convex packages

Auth widgets, billing, and design tooling that live in your own codebase. You own the code, host it yourself, and keep costs under control. The Svelte + Convex adapters behind it are open source.
Back then we couldn't build a decent layout, no auth provider fit our needs, and our planning was spread across spreadsheets and decks. Those problems became my work: open-source auth, billing, and design tooling for Svelte + Convex, and software that keeps a founder's whole business in one model.
Right now I'm working on
Stars and downloads come live from GitHub and npm. The rest is from product work and leading teams.
Open Source
270+
GitHub Stars
190,000+
Downloads last 30 days
Product & Design
6,200+
Figma Users
70
paid customers
Leadership
15
people led
€2.5M
annual budget
Two projects, and both started as problems at my first company.
For developers

Auth widgets, billing, and design tooling that live in your own codebase. You own the code, host it yourself, and keep costs under control. The Svelte + Convex adapters behind it are open source.
For founders

I'm building a tool where you describe your business once: your customers, their problems, the alternatives they use today, your offer, and your price. The go-to-market plan, a landing page per audience, and the business plan are generated from that. Once real sales and usage data come in, you see which assumptions held up.
270+
GitHub Stars
190,000+
Downloads last 30 days
70
paid customers
6,200+
Figma Users
Svelte adapter for Better Auth on Convex
Svelte adapter for Convex Auth
Production-ready auth & org widgets
The Svelte client for Convex
Subscriptions & billing for Convex
Design system kit for Skeleton & Tailwind
What I enjoy most is helping people build things themselves, so they can fix real problems for themselves, their friends, and the people around them.
In 2019 we founded Dechea, a practice management app for dentists. Our first feature was a calendar, and we failed at it. We came from backend development and didn't know CSS well enough to build even a basic layout. Hiring frontend developers didn't help either, because we couldn't tell good design work from bad.
So we learned it ourselves, the slow way. We tried Material, Chakra, and Mantine. They all worked, but our product always looked like someone else's. In the end we built our own design system. It took months, and afterwards our screens finally looked consistent and we trusted our own UI decisions.
Then came auth. We needed multiple organizations per account, privacy, and self-hosting, so we tried everything from Keycloak to Clerk. Some were too complex, some too restrictive, some too expensive. Most didn't look like our brand, and sending our users' data to a third party felt wrong.
That's where Etesie comes from: auth, billing, and design building blocks that teams run themselves and shape to fit their product.
Building Dechea showed me a second problem. Market fit, go-to-market, financial planning, hiring, and fundraising usually live in separate spreadsheets, decks, and notes, and nothing keeps them in sync. So I'm building a business compiler that turns one description of your business into the plan, the website, and the pricing, and updates as real data comes in.
In January 2026 I became a Convex Champion. Today I maintain five open-source packages for Svelte + Convex, from auth adapters and billing to the Svelte client itself.
I build self-hosted auth, billing integrations, and the Svelte client for Convex, plus theme tooling and Figma kits that more than 6,200 designers and developers use.
Product direction, architecture, the design system, and the open-source packages and their community
Dec 2024 - Present
I'm building software that turns one model of a business into its go-to-market plan, landing pages for each audience, pricing, and business plan, and checks the assumptions against real sales and usage data.
I own the product, the method behind the model, the architecture, and the code
May 2024 - Present
Software that lets dentists plan a treatment in under two minutes.
Product strategy, software architecture and toolchain, technical leadership, and mentoring the engineering team
Aug 2020 - May 2024
Billing and payments for Connected Drive, BMW's infotainment system, through doubleSlash.
Led an agile team of 15 people and was responsible for product quality, the €2.5M annual budget, and the project's success
Jan 2019 - Jul 2020
Billing and payments for Connected Drive, BMW's infotainment system, through doubleSlash.
Helped lead and coach a team of 15, responsible for quality assurance and day-to-day delivery
Apr 2017 - Dec 2018
Internal tools and custom software for clients.
Built a continuous delivery toolchain and automated tests, wrote training documentation, and implemented client requirements
Sep 2016 - Mar 2017
Vocational training in software development.
Built and maintained applications, learned the basics of software architecture, and worked on client and internal projects
Sep 2013 - Aug 2016
Secondary education with intermediate school certificate.
Until Jul 2013
I do my best work where the product, the code, and the business model all have to fit together. If that sounds like your situation, write me.