Software Engineer, Voice AI / Backend

About the Role

Join a small, fast-moving engineering team building voice AI agents for customer-facing workflows. You will own projects end to end, working across applied AI, real-time audio, and distributed systems to solve practical customer problems.

Compensation & Benefits

€85,000 to €160,000 annually, plus equity. Visa sponsorship is available. Relocation support is available.

Location

On-site in Berlin, Germany.

Responsibilities

Build reliable voice AI systems, including retrieval-augmented generation, dynamic model routing, and testing transcription services before production rollout.; Design and operate a distributed call scheduler that manages concurrency, race conditions, time zones, retries, and provider limits.; Extend agents across voice, messaging, and email, with shared memory and state for asynchronous and real-time conversations.; Develop memory and reasoning systems that preserve context throughout customer workflows.; Build AI-assisted tools for configuring agents, debugging issues, and connecting to business systems such as CRMs, calendars, and email.; Improve tracing and resilience so failures across calls, workers, and providers can be diagnosed and handled effectively.

Requirements

Production experience building and owning distributed product systems, and a track record of shipping projects end to end.; Experience with Python, FastAPI, or TypeScript in production, plus PostgreSQL, Redis, or comparable data stores.; Background in real-time systems, audio processing, or voice infrastructure, and experience with concurrency, load balancing, or fault tolerance.; Experience shipping LLM, AI model, or agentic systems, and working with AWS, GCP, or Azure.; Familiarity with workflow orchestration or message queues, observability tools, and full-stack development is useful.; Technologies include LiveKit, Bun, Node.js, Fastify, React, Temporal, and OpenTelemetry.; Strong software fundamentals, independent problem-solving, and a team-oriented focus on customer and business outcomes.