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 .