Senior Fullstack Engineer

ABOUT THE ROLE This is a high-ownership Senior Fullstack Engineer position at a fast-growing European Voice AI startup serving thousands of SMEs. You will own features end-to-end, from initial concept through production deployment, and play a direct role in shaping the product roadmap as the company scales. WHAT YOU'LL DO - Build and ship full-stack features nearly daily using NestJS and React, owning the full lifecycle from prototype to production. - Engage directly with customers through support, feedback sessions, and user testing to identify and validate real needs. - Prioritize ruthlessly, breaking features into their highest-value parts and iterating based on real customer insights. - Take on increasing responsibility for feature and opportunity prioritization within the Voice AI product as you grow into the role. - Work in a deep-focus environment with minimal meetings, maximizing time for meaningful engineering work. WHAT WE'RE LOOKING FOR - 5+ years of hands-on fullstack engineering experience delivering end-to-end features in SaaS products. - Strong proficiency with TypeScript, React, and Node.js; experience with NestJS is strongly preferred. - Substantial experience across both backend and frontend, with a track record of shipping customer-facing applications end-to-end. - Native German speaker (required to actively contribute to AI product development and customer-facing language quality). - Fluent English for team and cross-functional communication. - Experience collaborating directly with customers, partners, or sales teams to understand pain points and define product value. - Comfort with product discovery: forming hypotheses, running experiments, and using metrics to support data-driven decisions. - Pragmatic, autonomous engineering mindset, you know how to cut scope without cutting value and thrive without heavy process overhead. - Bonus: experience integrating LLMs (such as OpenAI) into production applications, deploying AI services on cloud infrastructure in Europe, or familiarity with GDPR and EU AI Act considerations. COMPENSATION & BENEFITS Salary range: 80,000 to 120,000 EUR annually. Visa sponsorship is not available for this role. LOCATION Fully remote, open to candidates based in Germany or Austria.