Senior AI Engineer – LLMs & Agents

Permanent employee, Full-time · Remote, Berlin, Hybrid

Your mission

Architect our core AI assistant: Lead the technical development of an agent that helps construction professionals process, improve, and validate complex construction documents.
Engineer robust agentic workflows: Own tool use, complex RAG pipelines, guardrails, and sub-agent orchestration.
Master context and memory: Solve state-management challenges to ensure coherent, long multi-turn interactions.
Own the feedback loop: Implement online and offline evaluation frameworks to balance latency, cost, and quality.
Drive product impact: Work with Product and Engineering to turn ambiguous business problems into concrete technical solutions.
Production-grade engineering: Write clean Python code and establish observability so agents are reliable in production.
Explore future horizons: Identify opportunities to expand capabilities, for example with multimodal inputs like visual plans.

Your profile

Strong engineering background: 5+ years of experience with production-grade Python and solid software design.
Deep expertise in LLM applications: Experience with agent architectures, advanced RAG strategies, and state/context management.
Product mindset: Comfortable with ambiguity and able to judge when to ship something that is good enough.
Bonus skills:
- Good understanding of German to debug domain-specific conversations.
- TypeScript experience for frontend integration.
- Classical ML or deep-learning knowledge for model optimization.

Why us?

Shape a product that solves real-life problems in the construction industry
Work in an open-minded, collaborative, dynamic, and international team
Fully remote team and work culture
Freedom in your working hours. It's the results that count.
Company off-sites and regular team events (offline and online)
Flexible working conditions with the possibility to do workations
Competitive compensation, a permanent contract, and modern work equipment
Open feedback culture with regular 1-on-1s

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About us

Cosuno – Revolutionizing construction through technology.
We are Cosuno – a fast-growing tech startup that is making the construction industry more efficient and transparent with our digital platform for tenders and procurement processes. Our goal: to solve the most complex challenges in the industry with innovation and simplicity.

Why Cosuno?
Artificial intelligence is the key to our solution: it analyzes millions of price data points and helps construction companies create precise and efficient bids. This not only saves our customers time but also helps them avoid unnecessary costs.
But for us, it's not just about technology – it's about the people who drive it. At Cosuno, you will work with creative minds who are reshaping the construction industry. We believe in diversity because we know that the best ideas come from different perspectives. An integrative and inclusive work environment is a matter of course for us.

Join us – Build the future of construction.

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Your application!

We appreciate your interest in Cosuno Ventures GmbH. Please fill in the following short form. Should you have any difficulties in uploading your files, please contact us by mail at people@cosuno.de.