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 end-to-end, shaping technical decisions and shipping reliable systems across applied AI, real-time audio, and distributed infrastructure.

What You'll Do

• Build fast, reliable voice AI systems, including retrieval-augmented generation, dynamic model routing, and testing transcription systems before production rollout.

• Design and operate distributed call scheduling systems that handle concurrent workloads, race conditions, time zones, retries, and provider limits.

• Extend agents to support calls, messaging, and email with shared memory and state across real-time and asynchronous conversations.

• Develop memory and reasoning systems that preserve context throughout customer workflows.

• Build AI tools that configure agents, help diagnose issues, and connect with business systems such as CRMs, calendars, and email.

• Improve observability and resilience so failures across calls, workers, and providers can be traced and addressed.

What We're Looking For

• Experience shipping and owning product software end-to-end, including distributed systems in production.

• Production experience with Python, FastAPI, or TypeScript, and data stores such as PostgreSQL or Redis.

• Experience with real-time systems, audio processing, or voice infrastructure, plus practical work with LLMs, AI models, or agentic systems.

• Understanding of concurrency, race conditions, load balancing, and fault tolerance, as well as cloud infrastructure on AWS, GCP, or Azure.

• Familiarity with workflow orchestration or message queues, and observability tools such as OpenTelemetry or Honeycomb.

• Comfort working across backend and, where useful, frontend systems such as React. Strong software fundamentals, independent problem-solving, and a focus on customer and business outcomes are important.

• Experience level may range from 2 to 10 or more years, with demonstrated ownership of production projects.

Compensation & Benefits

€85,000 to €160,000 annually, plus equity. Visa sponsorship and relocation support are available.

Location

On-site in Berlin, Germany.