Micha Mailänder

Building tools for developers and founders

Etesie · since Dec 2024 Convex Champion

I build the tools I was missing when I founded my first company.

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

  • Etesie: auth, billing, and design tooling for Svelte + Convex
  • A business compiler that turns one model of your business into your plan, website, and pricing

Highlights

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

What I build

Two projects, and both started as problems at my first company.

For developers

Etesie and my Svelte + Convex packages

Etesie theme generator preview

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.

Self-hosted authBilling with CreemDesign system & Figma kit

For founders

A business compiler

Business compiler preview

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.

One model of your businessLanding pages per audienceAssumptions checked against real data

Open Source

270+

GitHub Stars

190,000+

Downloads last 30 days

70

paid customers

6,200+

Figma Users

My Story

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.

Experience

Founder
Etesie

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

Founder

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

CEO & Co-Founder
Dechea

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

Project Lead
BMW

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

Project Lead Assistant
BMW

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

Software Developer
doubleSlash

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

IT Specialist Apprenticeship
doubleSlash

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 School
Graf-Soden-Realschule Friedrichshafen

Secondary education with intermediate school certificate.

Until Jul 2013

Work with me

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.

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