Senior Fullstack Engineer
About the Role
This is a Senior Fullstack Engineer role at a fast-growing European AI voice assistant company serving small and medium-sized businesses. You will take end-to-end ownership of product features, from early discovery and prototyping through to architecture, implementation, and release, in a remote-first environment with a strong product and customer focus.
What You'll Do
Own features across the full product lifecycle: idea, prototype, architecture, implementation, and release.
Engage regularly with customers, partners, and Sales to surface real pain points and define value.
Run product discovery by forming hypotheses and validating them quickly through lightweight experiments.
Instrument your areas of ownership and gather metrics to support data-driven decisions.
Build pragmatic, scalable software that balances immediate value with long-term maintainability.
Communicate asynchronously and prioritize shipping over excessive meetings.
Act with radical ownership and drive initiatives forward independently.
What We're Looking For
5+ years of experience in fullstack engineering with end-to-end delivery responsibility for customer-facing web applications.
Strong hands-on experience with Node.js, TypeScript, NestJS, and React; substantial frontend and backend coverage is required.
Experience with product discovery: forming hypotheses and validating them quickly through experiments.
Comfortable identifying, collecting, and using metrics to inform product decisions.
Skilled at collaborating directly with customers and partners to extract actionable insights.
Native-level German proficiency is required; fluent English is also expected for team communication.
Experience integrating LLMs (such as OpenAI) into production software is a strong plus.
Familiarity with GDPR and EU AI Act considerations for AI-powered services is a plus.
Experience working in a high-growth startup environment is a plus.
Strong CS fundamentals and sound judgment around effort, quality, and speed trade-offs.
Compensation & Benefits
Salary range: 80,000 to 120,000 EUR annually. Visa sponsorship is not available.
Location
Fully remote, with a preference for candidates based in Germany or Austria and availability during Central European Time hours. Occasional in-person collaboration in Vienna is possible.