Senior AI Product Engineer

Join our team and build the intelligent systems at the core of Cosunos platform.

• Generative AI: Build and improve our LLM-powered systems that 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.

• Collaborate across teams: Work with Product Engineering and Data to translate business problems into shipped AI features.

• Maintain production AI: Monitoring alerting and continuous improvement of everything we deploy.

• TypeScript React Node: Non-negotiable. Youre comfortable shipping into our web app end-to-end front-end backend service API.

• Strong Python: You have 5 years writing production-grade Python. You write clean well-structured code.

• End-to-end product delivery: Youve shipped AI-powered features 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: Youre 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 youre unsure something will work your instinct is to find out with data rather than keep wondering.

We believe in a calm collaborative and productive engineering environment. We trust our engineers and give them the autonomy to do their best work. Our approach includes:

• Agile & Fast-Paced: We practice trunk-based development with daily releases to get value into our users hands quickly.

• Quality by Default: We maintain a comprehensive Cypress E2E test suite and enforce strict typing linting and formatting rules to keep our codebase clean and maintainable.

• DevOps Mindset: Our well-oiled CI/CD pipeline deploys to AWS via Kubernetes with our entire infrastructure managed as code using Terraform.

• Collaboration & Transparency: We value open discussion constructive code reviews and a culture where the best idea wins regardless of who it comes from.

• Competitive Compensation: A competitive salary above the market average.

• Work-Life Balance: Choose to work 100% remotely or from our modern office in Berlin. We offer flexible working hours to fit your life.

• Top-Notch Equipment: A new MacBook Pro to ensure you have the best tools for the job.

• A Great Team: Regular company off-sites and team events that connect us as people not just colleagues.

• Job Security: A permanent contract in a stable well-funded company.

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 its not just about technology its 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.

Required Experience:

Senior IC