Principal ML Engineer

The role

You will join the ranking team to build intelligent systems at the core of the platform. You will own ranking and recommendation systems, AI for construction, price prediction, and agentic systems from design to production.

What you will do

• Own and improve systems that match subcontractors to tenders
• Take new models and AI capabilities from idea to production
• Improve models that help users evaluate bids and make procurement decisions
• Design offline evals and run online A/B tests
• Build and improve an agentic system for tendering workflows
• Ship work into the product including models, backend services, APIs, and TypeScript web app integration
• Work with Product and Data to decide what to build
• Monitor, alert, and continuously improve deployed ML and AI

Required qualifications

• Ranking and recommendation experience building, evaluating, and improving models
• End-to-end ownership of features from product problem to production service
• Product judgment to make pragmatic decisions
• 5+ years building, training, and shipping machine learning models in production
• Fluency in a modern deep learning framework
• 5+ years writing production-grade Python
• Knowledge of evaluating models via offline metrics and online A/B tests

Nice to have

• Hands-on experience building and deploying LLM or agent systems — RAG, tool use, evals
• TypeScript, React, or Node experience
• Experience building search systems or pricing models
• Experience with embedding models, fine-tuning, or model training at scale
• Domain exposure to construction, procurement, or marketplaces

Benefits

• 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
• Company off-sites and regular team events (offline and online)
• Flexible working conditions with the possibility to do workations
• Competitive compensation
• A permanent contract
• Modern work equipment

About the company

Cosuno is a fast-growing tech startup making the construction industry more efficient and transparent with a digital platform for tenders and procurement processes.