Senior Fullstack Engineer

ABOUT THE ROLE We are a fast-growing, seed-stage European AI SaaS company building an AI-powered phone assistant platform used by thousands of small and medium-sized businesses across Europe. Our product automates inbound calls — handling customer inquiries, booking appointments, processing orders, and more — with a strong focus on GDPR compliance and a European-first approach. As a Senior Fullstack Engineer, you will take end-to-end ownership of product features that deliver measurable value to customers. You'll work in a remote-first, high-autonomy environment where shipping and customer impact matter more than meetings. Native-level German proficiency is required for this role, as the product serves German-language markets. WHAT YOU'LL DO - Own features from idea and prototype through architecture, implementation, and release. - Engage continuously with customers, partners, and sales to surface real pain points. - Run product discovery by forming hypotheses and validating them with quick, lightweight experiments. - Instrument relevant metrics to enable data-driven decisions in your product area. - Build pragmatic, scalable software balancing immediate value with long-term maintainability. - Communicate asynchronously where possible and prioritize shipping over excessive meetings. - Act with radical ownership — push initiatives forward without waiting for permission. - Work remotely with CET overlap, with occasional option to work from the Vienna office. WHAT WE'RE LOOKING FOR Required (Dealbreakers): - 5+ years of experience in fullstack engineering with end-to-end delivery responsibility. - Strong hands-on experience with Node.js, TypeScript, NestJS, and React. - Native-level German language proficiency (essential for the product and customer context). Also Required: - Experience with product discovery — forming hypotheses and validating them quickly through experiments. - Track record of identifying, collecting, and using metrics to support data-driven product decisions. - Experience collaborating with customers, partners, and sales to understand pain points and define value. - Experience delivering end-to-end software from architecture decisions through to customer-facing releases. Nice to Have: - Experience integrating LLMs (e.g., OpenAI) into production software applications. - Experience deploying AI-enabled services on Microsoft Azure in European environments. - Familiarity with GDPR and EU AI Act considerations for AI services. - Prior experience in a high-growth startup environment. LOCATION & WORK ARRANGEMENT - Fully remote — remote-first culture with CET timezone overlap expected. - Option to work from the Vienna, Austria office as needed. - Visa sponsorship is not available. COMPENSATION & BENEFITS - Salary range: $80,000 – $120,000 USD annually. - High-autonomy, low-bureaucracy remote-first work environment. - Direct impact on a product used by thousands of European businesses. - Work alongside a team with backgrounds at leading enterprise tech and SaaS companies.