Senior Fullstack Engineer

About the Role

We are a seed/early\-stage B2B SaaS company building an AI\-powered phone assistant for the German\-speaking market. Serving thousands of SMEs across the DACH region, our platform automates customer communication — handling inbound calls, scheduling appointments, transcribing conversations, and integrating with CRMs and calendar tools. We are a remote\-first, high\-growth team based in Vienna, Austria, and we are looking for a Senior Fullstack Engineer who takes genuine end\-to\-end ownership of the features they ship.

What You'll Do

• Own features from initial idea and prototype through architecture, implementation, and production release.


• Engage continuously with customers, partners, and the Sales team to surface real pain points and define meaningful value.


• Run product discovery: form hypotheses and validate them quickly with lightweight experiments before committing to large builds.


• Instrument your area of the product and gather the metrics needed to support data\-driven decisions.


• Build pragmatic, scalable software that balances immediate customer value with long\-term maintainability.


• Communicate asynchronously and prioritize shipping over excessive meetings.


• Act with radical ownership — push initiatives forward without waiting for permission.

What We're Looking For

Must\-haves (dealbreakers):

• 5\+ years of Fullstack Engineering experience delivering end\-to\-end web features.


• Strong hands\-on experience with Node.js, TypeScript, NestJS, and React.


• Native\-level German proficiency — essential for working with a German\-language AI product and German\-speaking customers.

• Experience with product discovery: forming hypotheses and validating them through rapid experiments.


• Comfortable identifying, collecting, and leveraging metrics to inform product decisions.


• Proven ability to collaborate with customers, partners, and sales teams to understand pain points.


• Track record of delivering customer\-facing applications end\-to\-end, including architecture decisions and release.

• Experience integrating LLMs (e.g., OpenAI) into production software applications.


• Experience deploying AI\-enabled services on Microsoft Azure in a European context.


• Familiarity with GDPR and EU AI Act considerations for AI services.


• Background in high\-growth startup environments.

Compensation \& Benefits

• Salary range: $80,000 – $120,000 USD annually.


• Remote\-first setup with optional office access in Vienna, Austria (CET overlap expected).


• High\-autonomy, low\-bureaucracy environment with direct customer impact.

Location

Fully remote (DACH / European timezone preferred — CET overlap required). Optional in\-person collaboration available from the Vienna, Austria office. Visa sponsorship is not available.

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