AI Engineer – Agentic Systems (Voice) (m/f/d)

Your Role

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 . This is a hands-on role at the intersection of reasoning, tool-use, and memory, designing intelligent agents that operate in complex environments, interact with APIs and structured data, and drive real-world outcomes. It goes well beyond prompt engineering: you will build robust decision pipelines and ship   product-ready agents   across both   text and voice modalities .

Proven experience building   voice agents   is an important requirement for this role. Voice is one of the most exciting frontiers of our product, and we want someone who has done it to help the whole team excel there. That said, this is not a voice-only role: you will contribute across the Intelligence Layer, and your voice background will be a force multiplier for everything we build together.

Your Mission

• Design & Optimize Workflows:   Design, implement, and optimize   agentic workflows   using LLMs across chat, meeting prep, and recommendations.
• Build Tool-Using Agents:   Create agents that interact with external APIs, databases, and environments.
• Advance our Voice Agents:   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.
• Integrate Memory & State:   Implement   retrieval, long-term memory , and   state tracking   into agent architectures.
• Deploy in Production:   Collaborate with product teams to   deploy agents in production   and keep them healthy.
• Evaluate & Improve:   Design and run   experiments   to evaluate agent performance, correctness, latency, and hallucination rates.
• Translate Product Needs:   Turn high-level product requirements into scalable, testable agentic features.

Your profile: What you need to succeed

• Voice AI (important requirement):   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.
• LLM Expertise:   Strong experience building with   LLMs   (e.g., OpenAI, Claude, Mistral, open-source models).
• Agentic Frameworks:   Familiarity with   agentic frameworks   (e.g. LangChain, LangGraph).
• Programming Proficiency:   Proficient in   Python   and modern ML tooling (e.g., Hugging Face, PyTorch, Ray, etc.).
• Tool Integration:   Experience with   tool integration , calling APIs, managing memory/state, or SQL query generation.
• Simulation-Based Testing:   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.
• Startup Mindset:   Comfortable in an iterative, fast-paced product environment, and energized by helping a small team level up.

Why Acto?

• Development Opportunities : Steep development opportunities without entrenched hierarchies.
• Culture:   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.
• Flexibility:   Enjoy a flexible work schedule and a remote set up with the option to work from our Berlin Office.
• Health & work-life balance:   Enjoy 30 days of vacation and an attractive Wellhub membership.
• Ownership:   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.
• Equipment:   You will receive a state-of-the-art hardware setup with a choice between Mac and Windows.