Optical R&D Engineer F/H

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Published on 04/09/2026

  • Contract type:  Permanent contract

  • Work time:  Full time

  • Location Rennes

The company

Founded in 2013, Cailabs designs, manufactures, and develops innovative photonic solutions for the space, industry, telecommunications, and defense sectors. A global specialist in laser shaping, the company has accelerated its growth in the space field with turnkey optical ground stations that integrate atmospheric turbulence compensation technology. This makes it one of the first companies to harness very high data rates enabled by optics in a commercial ground station.

Cailabs currently has more than 200 employees, including 41PhDs. With 29 patent families filed, the company is one of the most innovative companies in France. It is headquartered in Rennes, with offices in Paris and Washington (USA).

Post description

After gaining your first few years of experience in industry, join a dynamic team of engineers and PhDs who share your passion for applying their expertise to stimulating technical challenges. 

Working in a multi-project environment, you will interact closely with different teams, fostering a strong collaborative dynamic and providing a highly stimulating and intellectually rewarding work environment. 

You will join a cutting-edge technology company, working across the full product development cycle, from prototype development through to industrialization. 

 

Your main responsibilities 

  • Contribute to the technical definition of product developments and evolutions in response to customer needs 
  • Contribute to upstream R&D projects to prepare future product developments 
  • Improve product performance by investigating and evaluating alternative technologies 
  • Prototype, test, integrate and interface various optical subsystems 
  • Experimentally validate new optical architectures 
  • Contribute to multidisciplinary projects in collaboration with the different technical teams (optics, electronics, mechanics and software) 
  • Support the different stages of product development through to production 

Profile required

  • Master’s degree or equivalent in Optics, Photonics or a related field, with at least 2 years of professional experience 
  • Strong knowledge of theoretical and experimental optics, as well as optomechanics 
  • Hands-on experience working in a laboratory environment and setting up experimental systems 
  • Proficiency in processing and analyzing experimental data, as well as interfacing measurement instruments and equipment through programming 

A plus that will make a difference 

  • Experience with simulation tools and programming languages such as Python, MATLAB or C 

Key soft skills 

  • Innovative mindset 
  • Strong analytical and synthesis skills, with a proactive approach 
  • Curiosity and a genuine desire to understand and learn 
  • Strong team spirit and ability to collaborate effectively within multidisciplinary teams 

Benefits

  • Regular opportunities for team bonding and social events (annual seminar, team lunches, group games, sports activities, etc.);
  • 100% employer-covered health insurance;
  • A bonus scheme rewarding both collective and individual performance;
  • Joining Cailabs also means having the assurance that everything will be put in place to help you perform, grow, and take on new challenges.

Required languages

  • English English - Level advanced

Réf: 5da81a03-8ea1-4f5b-ad85-4988af5d9972

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Optical R&D Engineer F/H

Permanent contract
Full time
Rennes

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