AI engineer for voice agents

We are growing our Agents team and looking for an experienced AI Engineer (m/f/d) to help build the next generation of agentic AI systems powered by Large Language Models (LLMs). Today the team is small and tight-knit, and every hire meaningfully shapes what we build and how we build it. You will work across our full agentic surface: chat, meeting preparation, recommendations, and voice.

• Design, implement, and optimize agentic workflows using LLMs across chat, meeting prep, and recommendations.
• Create agents that interact with external APIs, databases, and environments.
• Push our voice-enabled agents forward, including pipeline design for real time conversation, transcription (ASR), speech synthesis (TTS), turn-taking, and dialogue management, with a focus on low latency and reliability.
• Implement retrieval, long-term memory, and state tracking into agent architectures.
• Collaborate with product teams to deploy agents in production and keep them healthy.
• Design and run experiments to evaluate agent performance, correctness, latency, and hallucination rates.
• Turn high-level product requirements into scalable, testable agentic features.

• Proven, hands-on experience building voice agents in production and working with ASR, TTS, or real-time/streaming voice pipelines. Voice is a core focus of this hire, and we expect you to bring real depth here.
• Strong experience building with LLMs (e.g., OpenAI, Claude, Mistral, open-source models).
• Familiarity with agentic frameworks (e.g. LangChain, LangGraph).
• Proficient in Python and modern ML tooling (e.g., Hugging Face, PyTorch, Ray, etc.).
• Experience with tool integration, calling APIs, managing memory/state, or SQL query generation.
• Experience with simulation-based testing and evaluation of conversational and voice agents (e.g. Coval, Bluejay), used to measure agent performance, correctness, and regressions at scale.
• Comfortable in an iterative, fast-paced product environment, and energized by helping a small team level up.

• Steep development opportunities without entrenched hierarchies.
• We are an ambitious team that wants to achieve a lot with Acto, but we don't take ourselves too seriously and like to have fun together, be it working together or at regular team events.
• Enjoy a flexible work schedule and a remote set up with the option to work from our Berlin Office.
• Enjoy 30 days of vacation and an attractive Wellhub membership.
• Whether you are an intern or a full-time acto-naut, Acto instills a deep sense of ownership, where every team member is entrusted with meaningful responsibilities and the autonomy to make impactful decisions.
• You will receive a state-of-the-art hardware setup with a choice between Mac and Windows.