Senior Fullstack Engineer
About the Role
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We are an angel-backed AI SaaS startup building a German-language AI phone assistant used by thousands of European businesses. Our small, high-growth team operates in a remote-first environment with strong CET overlap, and we are looking for a Senior Fullstack Engineer who thrives on end-to-end ownership — from idea through architecture, implementation, and release.
This role sits at the intersection of engineering and product: you will engage directly with customers, run experiments, and ship features that deliver measurable value. Native-level German proficiency is required , as our product and many of our customers operate in German.
What You’ll Do
- Own features end-to-end — from prototype and architecture decisions through to customer-facing release.
- Engage continuously with customers, partners, and the sales team to surface real pain points and translate them into product improvements.
- Run product discovery by forming hypotheses and validating them with lightweight experiments before building large systems.
- Instrument and track the metrics relevant to your area to enable data-driven decisions.
- Build pragmatic, scalable software that balances immediate customer value with long-term maintainability.
- Communicate asynchronously where possible and prioritize shipping over excessive process.
- Act with radical ownership — push initiatives forward without waiting for permission.
- Work remotely with CET overlap, or from the Vienna office as needed.
What We’re Looking For
- 5+ years of full-stack engineering experience delivering end-to-end web features.
- Strong proficiency in Node.js, TypeScript, NestJS, and React.
- Native-level German proficiency — non-negotiable for this role.
- Product mindset: you measure success by customer value, not lines of code.
- Experience with product discovery — forming hypotheses and validating them quickly through experiments.
- Comfortable owning analytics, tracking, and data to support product decisions.
- Experience collaborating directly with customers, partners, and sales to define value and understand pain points.
- Strong CS fundamentals and sound judgment on effort/quality/speed trade-offs.
Nice to have:
- Experience integrating LLMs (e.g., "OpenAI") into production applications — a significant 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.
Compensation & Benefits
- Salary: $80,000 – $120,000 USD annually (or equivalent), depending on experience.
- Remote-first culture with strong async communication norms.
- Small, high-ownership team where your impact is visible and meaningful.
Location
Fully remote with CET timezone overlap preferred. The team is headquartered in Vienna, Austria ; occasional in‑office collaboration is possible. xhdzyng Visa sponsorship is not available — candidates must already have the right to work in the relevant jurisdiction.
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