Senior ML Engineer

Senior ML Engineer at cosuno in Berlin/Remote, Germany.

Responsibilities

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.

Requirements

• 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.

BONUS

• 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

About the Company

• 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.