Senior Fullstack Engineer

About this role

ABOUT THE ROLE

Join a fast-growing European AI voice tech company building an AI-powered phone assistant for small and medium-sized businesses. As a Senior Fullstack Engineer, you'll take end-to-end ownership of product features — from idea and prototype through architecture, implementation, and release — on a remote-first team with real customer impact.

WHAT YOU'LL DO

- Own features across the full stack, from discovery and architecture to shipping and measuring outcomes.

- Engage directly with customers, partners, and Sales to surface real pain points and inform what gets built.

- Form hypotheses and validate them quickly through lightweight experiments before committing to large-scale solutions.

- Instrument features and gather metrics to enable data-driven product decisions.

- Build pragmatic, scalable software balancing immediate customer value with long-term maintainability.

- Communicate and collaborate asynchronously, prioritizing shipping over excessive meetings.

- Act with radical ownership — push initiatives forward without waiting for permission.

WHAT WE'RE LOOKING FOR

- 5+ years of experience in fullstack engineering with end-to-end delivery responsibility for customer-facing applications.

- Strong hands-on experience with Node.js, TypeScript, NestJS, and React.

- Experience integrating LLMs (e.g., OpenAI) into production software applications — a significant plus.

- Product mindset: you measure success by customer value, not lines of code.

- Skilled at extracting actionable insights from direct conversations with users, partners, and sales teams.

- Comfortable owning analytics, tracking, and the data layer needed to support product decisions.

- Experience deploying AI-enabled services on cloud infrastructure in Europe (e.g., Microsoft Azure) is a bonus.

- Familiarity with GDPR and EU AI Act considerations for AI-powered services is a plus.

- Experience working in a high-growth startup environment.

- Strong CS fundamentals and sound judgment when trading off effort, quality, and speed.

- Native-level German proficiency is required — the product serves a German-language market.

COMPENSATION & BENEFITS

Salary range: €80,000 – €120,000 annually. Visa sponsorship is not available.

LOCATION

Fully remote, with a preference for candidates based in Germany or Austria (CET timezone overlap expected). Optional access to a Vienna office.