Senior Fullstack Engineer

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.