Build fast.
Ship smarter.
Fullstack development for startups that move fast. React · TypeScript · Node.js. Based in Germany.
React
TypeScript
Next.js
Node.js
Supabase
StripeReactTypeScriptNext.jsNode.jsSupabaseStripePrecision Services
Fullstack Web Apps
End-to-end engineering from architecting the cloud infrastructure to crafting pixel-perfect interfaces that scale with your users.
SaaS Products
Conversion-optimized landing pages and multi-tenant application architectures.
APIs & Integrations
Robust GraphQL/REST APIs and third-party plumbing for seamless data flow.
No surprises.
Just results.
Discovery Call
30min, free, no commitment. We define scope, timeline, and budget.
Proposal
Detailed spec, fixed price or hourly, signed contract. No surprises.
Build
Weekly updates, staging environment access, async communication via Loom/Slack.
Ship & Support
Deployment, handoff, 30-day post-launch support included.
Selected Work
MAERZ Studio DevTools
Under NDA
Available for Q3 2026
Code speaks louder than quotes.
Free tools shipped & live at tools.maerz.studio
Client-side — zero tracking, zero backend
Years writing production TypeScript
All work in public. No lorem ipsum — just shipped code.
View GitHub →I write the code.
I own the product.
I ship on time.
I'm Justin März, a developer who thinks like a product owner. I believe that engineering isn't just about syntax—it's about building machines that solve real business problems.
Based in Germany, working globally. I specialize in taking messy ideas and condensing them into high-performance digital engines.
Justin März
Fullstack Developer · Maerz Studio