Senior Fullstack Engineer

Stack

Responsibilities

• ▹Own features across the full stack, from discovery and architecture to shipping and measuring outcomes.
• ▹Engage directly with customers, partners, and Sales to surface real pain points and inform what gets built.
• ▹Form hypotheses and validate them quickly through lightweight experiments before committing to large-scale solutions.
• ▹Instrument features and gather metrics to enable data-driven product decisions.
• ▹Build pragmatic, scalable software balancing immediate customer value with long-term maintainability.
• ▹Communicate and collaborate asynchronously, prioritizing shipping over excessive meetings.
• ▹Act with radical ownership — push initiatives forward without waiting for permission.

Requirements

• ▹5+ years of experience in fullstack engineering with end-to-end delivery responsibility for customer-facing applications.
• ▹Strong hands-on experience with Node.js, TypeScript, NestJS, and React.
• ▹A product mindset — measuring success by customer value, not lines of code.
• ▹Skilled at extracting actionable insights from direct conversations with users, partners, and sales teams.
• ▹Comfortable owning analytics, tracking, and the data layer needed to support product decisions.
• ▹Strong CS fundamentals and sound judgment when trading off effort, quality, and speed.
• ▹Native-level German proficiency — the product serves a German-language market.

Nice to have

• ▹Experience integrating LLMs (e.g., OpenAI) into production software applications.
• ▹Experience deploying AI-enabled services on cloud infrastructure in Europe (e.g., Microsoft Azure).
• ▹Familiarity with GDPR and EU AI Act considerations for AI-powered services.
• ▹Experience working in a high-growth startup environment.

What we offer

• ▹Salary range: €80,000–€120,000 annually.
• ▹Fully remote, with a preference for candidates based in Germany or Austria (CET timezone overlap expected).
• ▹Optional access to a Vienna office.

About the company

A fast-growing European AI voice tech company building an AI-powered phone assistant for small and medium-sized businesses, with a remote-first team and real customer impact.