Senior Fullstack Engineer

We're a fast-growing, angel-funded European AI SaaS startup building a German-language AI phone assistant used by thousands of businesses across Europe. Our small, high-ownership engineering team works in a remote-first environment, and we're looking for a Senior Fullstack Engineer to take end-to-end responsibility for building product features that deliver real, measurable value to customers.

You'll work at the intersection of product and engineering — owning features from first idea through architecture, implementation, and release. Native-level German proficiency is required for this role, as our product and customers are primarily German-speaking.

What You'll Do

• Own features end-to-end: from idea and prototype through architecture, implementation, and production release.
• Engage directly and continuously with customers, partners, and Sales to surface real pain points and turn them into product improvements.
• Run product discovery by forming hypotheses and validating them with lightweight, quick experiments before committing to large builds.
• Instrument your features and gather the metrics needed to enable data-driven product decisions.
• Build pragmatic, scalable software that balances immediate customer value with long-term maintainability.
• Communicate asynchronously wherever possible and prioritize shipping over excessive meetings.
• Act with radical ownership — push initiatives forward without waiting for permission.
• Work remotely with CET overlap, with the option to work from the Vienna office as needed.

Must-haves (dealbreakers):

• 5+ years of experience as a fullstack engineer with end-to-end delivery responsibility for customer-facing web applications.
• Strong hands-on experience with Node.js, TypeScript, NestJS, and React.
• Native-level German language proficiency.

• Experience with product discovery: forming hypotheses and validating them quickly through experiments.
• Proven ability to identify, collect, and use metrics to support data-driven decisions.
• Track record of collaborating with customers, partners, and sales teams to understand pain points and define value.
• Experience owning architecture decisions through to production release for customer-facing applications.

• Experience integrating LLMs (e.g., OpenAI) into software applications — a major plus.
• Experience deploying AI-enabled services on Microsoft Azure in Europe.
• Familiarity with GDPR and EU AI Act considerations for AI services.
• Prior experience in a high-growth startup environment.

• Salary range: $80,000 – $120,000 USD annually
• Remote-first work environment with CET overlap
• High autonomy and direct impact on product direction
• Work with a lean, high-calibre team on cutting-edge AI technology

Location

Fully remote (CET overlap preferred). Optional access to the Vienna, Austria office. Candidates based in Austria or Germany are particularly well-positioned.