Join our AI team and build the intelligent systems at the core of Cosuno's platform.
AI Agent Development: Build and improve our agentic system that orchestrates multi-step reasoning to navigate the complex, often messy tendering workflow.
Ship end-to-end into the product: Own features from model/agent through API to the TypeScript front-end — backend service, API, and the integration into the web app.
Ranking, Search & Retrieval: Iterate on the ranking and retrieval systems that power subcontractor matching and marketplace search.
Price Prediction: Improve models that estimate fair pricing for construction work, helping users evaluate bids and make better procurement decisions.
Experimentation & Evaluation: Design offline evals, run online A/B tests, and drive metrics-led iteration.
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.
Your profile
Strong Python: You have 5+ years writing production-grade Python. You write clean, well-structured code.
TypeScript, React, Node: Non-negotiable. You're comfortable shipping into our web app end-to-end — front-end, backend service, API.
End-to-end product delivery: You've shipped features (not just models) into a production web app and owned the integration from research code to real users.
LLM application depth: You have deep hands-on experience building and deploying LLM/agent systems — RAG, tool use, multi-step reasoning, evals.
Backend engineering skills: You design APIs, data pipelines, and services.
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.
Bonus
Comfort with 'classical' ML foundations
Experience building search/ranking/recommendation or price prediction systems
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
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.
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.
