Senior Software Engineer, Voice AI / Backend

ABOUT THE ROLE Join a small engineering team building voice AI agents for customer-facing business workflows. You will own projects from product decisions through architecture and production delivery, helping make real-time AI interactions reliable and useful. WHAT YOU'LL DO - Build reliable voice AI systems, including retrieval-augmented generation, dynamic model routing, and testing new transcription systems before release. - Design and operate distributed call scheduling systems that handle concurrency, time zones, retries, provider limits, and failures. - Extend agents across voice and other communication channels, maintaining shared context across real-time and asynchronous conversations. - Develop memory and reasoning capabilities that help agents maintain context through customer workflows. - Build AI-powered tools for configuring agents, troubleshooting issues, and connecting to business systems. - Improve observability and resilience so issues can be traced to their root causes. WHAT WE'RE LOOKING FOR - At least 2 years of relevant experience building and shipping product software, including owning distributed systems in production and delivering projects end to end. - Production experience with Python, FastAPI, or TypeScript, and data stores such as PostgreSQL or Redis. - Experience with distributed systems, real-time systems, audio processing, voice infrastructure, or production AI and agentic systems. - Familiarity with cloud infrastructure such as AWS, GCP, or Azure. - Experience with workflow orchestration or message queues, frontend development, and observability tools is useful. - Strong software fundamentals, a bias toward action, and an interest in business outcomes and reliable AI products. - Relevant technologies include LiveKit, Bun, Node.js, Fastify, React, Temporal, and OpenTelemetry. COMPENSATION & BENEFITS Base salary is €85,000 to €160,000 annually, plus equity. Visa sponsorship is available. LOCATION On-site in Berlin, Germany.