Operations Research Engineer

About Hexaly

At Hexaly, we are not just improving mathematical optimization: we are rethinking how it should be done. We build next-generation technology that combines advanced algorithms with a modern modeling paradigm to solve real-world problems at scale.

We are a deeply competitive team. We care about performance, we benchmark relentlessly, and we aim to outperform the best solutions in the world. Winning matters.

Our ambition is clear: to become the #1 mathematical optimization platform globally within the next five years. If you are driven by impact, technical excellence, and the desire to build category-defining technology, Hexaly is the place to do it.

We have 2 Operations Research Engineer positions open at Hexaly for 2026.

Your Job

You are part of the Hexaly R&D team. As an Optimization Engineer, you will work at the intersection of software engineering and applied optimization. Your responsibilities will include:

• Designing and developing optimization templates for real-world problems;
• Building and maintaining benchmarks to evaluate performance and scalability;
• Providing technical support to customers, helping them model and solve complex optimization problems;
• Collaborating closely with our core R&D team to improve models and solver usage.

Your Profile

• You have a Master's or Ph.D. degree in Operations Research, Computer Science, Applied Mathematics, Industrial Engineering (university or engineering school);
• Strong programming skills (Python, C++, or similar);
• Solid understanding of optimization concepts (MIP, CP, heuristics, etc.);
• Pragmatic, problem-solver mindset with strong communication skills;
• You have an eye for detail, you like a job well done, and you don't fear code reviews;
• You are very organized, can follow processes and practices carefully;
• You can listen and handle direct feedback on all that you do;
• You have a high degree of commitment to work and are not afraid of change;
• You possess excellent written and oral communication skills in English.

In the first weeks, we will coach you intensively to deepen your understanding of Hexaly's products and to acquire Hexaly's software development best practices.

What We Offer

• A key role in a fast-growth deep tech company;
• Exposure to a wide range of real-world optimization challenges;
• Close interaction with top-tier researchers and engineers;
• Clear growth path toward an Optimization Scientist role within ~2 years for top performers.

Annual gross salary between €40,000 and €45,000, depending on profile and experience, plus various advantages (RTT, excellent healthcare insurance, lunch, public transportation, coffee and tea, etc.).

Recruitment Process

• Remote interview with Julien, founder & Head of Science (30 minutes)
• Remote interview with 2 Senior Optimization Scientists (1 hour)
• Welcome among us! A welcome breakfast with your future colleagues awaits you :-)