Join our AI team and build the intelligent systems at the core of Cosuno's platform.
AI for Construction: Take new models and AI capabilities from idea to production — design, train, evaluate, deploy, iterate — and own them end to end.
Price Prediction: Improve the models that help users evaluate bids and make better procurement decisions, trained on millions of price data points.
Ranking, Search & Retrieval: Iterate on the systems that match the right subcontractors to the right tenders.
Experimentation & Evaluation: Design offline evals, run online A/B tests, and drive metrics-led iteration.
AI Agent Development: Build and improve our agentic system that orchestrates multi-step reasoning to navigate the complex, often messy tendering workflow.
Ship into the product: Take your work all the way to real users — model, backend service, API, and the integration into our TypeScript web app.
Collaborate across teams: Work with Product, Engineering, and Data to translate business problems into shipped ML/AI features.
Maintain production ML & AI: Monitoring, alerting, and continuous improvement of everything we deploy.
Strong ML & deep learning background: You have 5+ years building, training, and shipping machine learning models — classical ML and deep learning — in production. You're fluent in a modern deep learning framework, ideally PyTorch.
Strong Python: You have 5+ years writing production-grade Python. You write clean, well-structured code.
LLM application depth: You have deep hands-on experience building and deploying LLM/agent systems — RAG, tool use, multi-step reasoning, evals.
Experimentation rigor: You know how to evaluate models properly — offline metrics, online A/B tests — and let the data decide.
TypeScript, React, Node: You're comfortable shipping your work into our web app — backend service, API, and front-end integration.
End-to-end product delivery: You've shipped features (not just models) into a production system and owned the path from research code to real users.
Product mindset: You're comfortable with ambiguity and can judge when something is good enough to ship.
Sharp problem solver: You look at a complex system, quickly identify what matters, and decide what to do next.
Bias for action: When you're unsure something will work, your instinct is to find out with data rather than keep wondering.
Experience building search/ranking/recommendation systems or pricing models
Experience with embedding models, fine-tuning, or model training at scale
Domain exposure to construction, procurement, or marketplaces
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
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.
Skills Required
- 5+ years writing production-grade Python
- Strong expertise in TypeScript, React, and Node
- Experience in end-to-end product delivery
- Hands-on experience with LLM/agent systems
- Backend engineering skills including API design
What We Do
Cosuno is a Berlin-based SaaS platform that digitizes procurement, tendering, and subcontractor management for the construction industry, utilizing AI for bid comparison and negotiation to ensure efficient and transparent collaboration.
