Senior Fullstack Engineer

### **About the Role** 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 i