Your mission
Let´s build the future of AI - together
Do you enjoy developing smart software that creates real added value? Are you fascinated by AI technologies—and do you want not only to understand them but also to turn them into productive applications that users rely on every day? Then you’ve come to the right place.
With One/AI, we offer a customized, secure, and intuitive solution that integrates AI into existing enterprise systems in compliance with the GDPR. As an AI Engineer, you’ll build the agent-based AI systems behind it—applications that respond in real time to data and user actions based on modern language models.
- You’ll build agent-based AI applications using pre-trained foundation models (Large Language Models, LLMs)—with tool calling, RAG (Retrieval-Augmented Generation, which enriches AI responses with our live data), and multi-agent orchestration.
- You process data in real time and integrate AI into our clients’ existing systems and data streams.
- You write clean, maintainable, production-ready code (Python; Rust is a plus) and take responsibility for it through to production.
- You develop evaluation and testing strategies for non-deterministic AI systems and build CI/CD pipelines (Continuous Integration / Continuous Delivery, automated build and delivery processes) as well as automated tests.
- You stay on top of new AI developments and translate promising approaches into features relevant to the business.
Your profile
- 2–5 years of experience in software development, with a proven track record of deploying applications into production (not just prototypes or notebook projects).
- Proficient in Python and backend development (APIs, system design, testing); interest in Rust is a plus.
- Experience with LLM-based applications: orchestration frameworks (e.g., LangChain/LangGraph or similar), tool/function calling, RAG, or agents.
- Familiar with agile methodologies (Scrum or Kanban).
- A basic understanding of machine learning and common ML tools (PyTorch, TensorFlow, ClearML) is a plus—however, we do not train our own foundation models; instead, we build applications on top of them.
What´s important to us
- You enjoy working in a team, taking on responsibility, and contributing ideas.
- You solve problems in a structured way while keeping the goal in mind.
- You’re curious, open to new ideas, and eager to grow.
- You communicate confidently in German and English.
Why us?
- Time and place that fit you: Flexible working hours, clean time tracking, the option to work part-time, and home office whenever it suits you.
- 30 days of vacation + 6 flex days: Plenty of time to switch off, on top of the usual.
- Well onboarded: Mentoring from day one, so you get up to speed fast.
- Macademy: Our own learning & development program – for everyone who wants more.
- Getting around: We subsidize your Deutschland-Ticket.
- On two wheels: (E-)bike leasing via Jobrad – with our own bike garage and showers, you'll arrive relaxed no matter how you get here.
- Taken care of, long-term: Company pension scheme is standard here.
- Fully catered: Subsidized lunch in our canteen, drinks are free all day, every day.
- Stay healthy: Wellpass or Urban Sports Club – whichever fits you.
- Team moments: Regular team events that are actually fun.
- Our home in Stuttgart: Bright, new office space, well connected to public transport – getting to us is quick and easy.
We were recognized by FOCUS-Business as one of the best mid-sized employers in Germany in 2026. Come see for yourself and take your career to the next level.
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