Co-Founder / Founding Engineer (LegalTech Startup – Marsstein)
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About Marsstein
Marsstein is an early-stage LegalTech startup reimagining how individuals resolve legal issues—affordably, transparently, and with emotional clarity. Our mission is to make legal help more human by combining AI-driven communication with a radically efficient legal workflow for partner law firms.
We’re not building yet another B2B tool for lawyers. Instead, we focus on consumer-side access and then route cases to law firms via a fully digital, AI-assisted experience. Think: the calm clarity of a tax assistant + the legal reliability of a Kanzlei — all in one.
The Role: Founding Engineer / Co-Founder
We're looking for a hands-on technical partner to lead the design, development, and launch of our first working product. You'll start small, iterate fast, and co-own the company from day one.
You will:
* Build the first version of the Marsstein platform (client-facing + lawyer backend)
* Choose and set up the tech stack (e.g., Next.js, Firebase, Supabase, LangChain, etc.)
* Develop and test early AI-based workflows (summarization, document extraction, structured intake, reminders)
* Integrate open-source LLMs or APIs for legal NLP tasks (e.g., PDF parsing, classification, text simplification)
* Co-design a secure messaging and document handling system (privacy-compliant, UX-focused)
* Collaborate on product strategy, MVP testing, and grant applications (EXIST, Gründungszuschuss, etc.)
* Work closely with the founder to recruit early users, test hypotheses, and iterate fast
You Might Be a Fit If You…
* Are a full-stack developer or strong frontend/backend engineer with product instincts
* Have experience with AI/LLMs, GPT APIs, LangChain, or open-source models
* Know how to build small and fast, not over-engineer MVPs
* Care about designing around emotional experience — not just utility
* Want to co-own and shape a mission-driven company from the ground up
* Bonus: German speaker or based in Germany (not mandatory but helpful)
Why Join Marsstein?
* Build something people need — we're tackling legal access, not chasing trends
* Own early architecture decisions and tech strategy
* Real equity & co-founder status — not an "early hire"
* Focus on product — we avoid complexity, and cut scope by design
* Platform for funding — EXIST, public grants, and pre-seed traction are aligned with our roadmap
Let’s Talk
If you want to build something real—small, clean, and genuinely useful—this is for you. Even if you're unsure, write me at jayson.chen@marsstein.com or message me on LinkedIn.
Seniority level
* Executive
Employment type
* Full-time
Job function
* Business Development and Sales
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