·4 min read
Why Your App Needs an Offline Mode (Even in 2026)
Why Your App Needs an Offline Mode (Even in 2026) If you're building a SaaS in 2026, you probably assume everyone has 5G. You assume everyone is always connecte...
Read more
I build with AI.
I grow intentionally.
I share what I learn.
Hey, I'm Jonas — founder of BauGPT. I write about AI engineering, growth hacking, and building products people actually want. No fluff, just what works.
Get new posts in your inbox
Weekly insights on AI, growth engineering, and building.
Latest Posts
·4 min read
Growth Metrics That Actually Matter for AI Products
Growth Metrics That Actually Matter for AI Products If you’re building an AI product, stop looking at your DAU (Daily Active Users) for a second. It might be ly...
Read more·6 min read
The Real Cost of "Free" AI APIs
Everybody's building with AI right now. OpenAI has a free tier. Anthropic gives you credits. Google hands out Gemini API access like candy at a conference. So y...
Read more·5 min read
Why I Chose React Native Over Flutter for BauGPT
Why I Chose React Native Over Flutter for BauGPT I get asked this question at every startup event. "Why React Native? Flutter is faster." Here's the honest answ...
Read more·5 min read
The 24/7 Autonomous Shipping System (And How I Built It)
I deployed 40+ TestFlight builds in a single week while I was at a team offsite in Munich. I barely touched my laptop. That's not an exaggeration — I was in mee...
Read more·5 min read
German Construction Has No APIs. So We Built Our Own.
The German construction industry moves about 400 billion euros a year. You'd think there would be APIs for everything. Building permits, material specs, complia...
Read more·3 min read
I Built SSO From Scratch on BauGPT Mobile. Here's Why It Took 3 Days.
I spent 3 days on Sign in with Apple. Apple controls the device. The user is already logged in. Just press a button. Should've been an afternoon. The Setup Buil...
Read more·4 min read
How I Stopped Bot Spam Without Requiring Login
Every indie app gets hammered by bots eventually. Sond — the trip planning app — hit this around month 2. Suddenly 40% of new accounts were fake. They'd load th...
Read more·4 min read
How a WhatsApp Bot Brought 1000 Test Users to Sond in 3 Weeks
Everyone says the same thing about indie launches: "Get on Twitter. Product Hunt will make or break you. Hacker News is where developers hang out." All true. Al...
Read more·5 min read
Why AI Doesn't Work for Most Startups (And How to Fix It)
"We added AI to our product!" crickets I see this pattern everywhere. Startup adds ChatGPT API. Slaps "AI-powered" on the landing page. Waits for users to care....
Read more·4 min read
How We Solved the €500M Language Barrier Problem in German Construction
A Polish excavator operator walks onto a German construction site. Nobody speaks Polish. He doesn't speak German. The foreman hands him blueprints in German. Sa...
Read more·4 min read
What Is an AI Growth Engineer? (And Why You Need One)
I get asked this question a lot: "What exactly is an AI Growth Engineer?" Fair question. The role didn't exist 18 months ago. Here's what it actually means — an...
Read more