Senior Founding Product Engineer

ABOUT THE ROLE Join a fast growing AI powered B2B SaaS startup as a founding product engineer, collaborating with a small team to ship end to end features for a German focused AI phone assistant used across Europe. You will own initiatives from idea to production and help scale the product and its adoption. WHAT YOU'LL DO - Own features end to end from hypothesis to production for products used by thousands of companies in Europe. - Lead product discovery by testing hypotheses through rapid experiments. - Maintain close contact with customers, partners, and Sales to surface real pain points. - Design and implement tracking to enable data driven decisions. - Build software across the stack and drive architecture choices through release. - Prioritize pragmatic solutions balancing immediate validation with long term scalability. - Run experiments and lightweight prototypes before large scale commitments. - Take ownership and move initiatives forward without waiting for sign offs. WHAT WE'RE LOOKING FOR - 3+ years of product engineering experience delivering features end to end. - Full stack experience with Node.js, TypeScript, NestJS, and React. - Experience integrating or working with large language models is a strong plus. - German language proficiency at B2 level or above, with English for team and product communication. - Hands on experience owning software architecture through production release. - Comfort in a startup environment and a pragmatic, data driven mindset. - Experience extracting and owning relevant metrics to iterate based on data. COMPENSATION & BENEFITS Salary range €80K-€120K annually. Equity available in a high growth environment. Visa sponsorship: not provided. LOCATION Work arrangement: remote first, with CET overlap; optional office access in Vienna. Primary location: Germany.