Refeyn is the world's pioneer in mass photometry – a ground-breaking technology that weighs individual molecules and particles with light. It transforms our ability to characterise the composition, structure and dynamics of biomolecules and biomolecular complexes, nanostructures, and viral capsids.

Since being spun out of the University of Oxford in 2018, Refeyn has been developing mass photometry instruments and delivering them to customers around the world – at leading academic institutions and in biopharma. We are continuously pushing the boundaries of what mass photometry can achieve.

With headquarters in Oxford, UK as well as offices in the US, we are a growing, global company with a team of over 170 employees (and growing). In addition to achieving market success, Refeyn has attracted a high level of investment – we raised $70m in our Series B funding round in March 2022.

At Refeyn, we are fiercely proud of our talented workforce, whose creativity, tenacity and skills have enabled us to evolve into a successful, well-funded and rapidly growing company in just a few years. To achieve our ambitions – to transform analytical workflows in the life sciences, biopharma and beyond with mass photometry – we are continuing to expand our workforce.

We strive to be an outstanding place to work – by maintaining a positive and inclusive culture, offering competitive salaries and benefits, encouraging ongoing training and development, plus, of course, plenty of other perks.


The Service and Support Engineer (SSE) will work as part of the Refeyn Service and Support Team, comprised of Support Scientists and Service Engineers, reporting to the North America Service and Support Manager. Ideally, the candidate will be located in the bay area. 

The SSE will mainly be responsible for activities related to servicing and repairing instruments in the Refeyn portfolio. The role is a customer-facing one, but also requires good communication skills with internal colleagues and a can-do attitude. In addition to helping customers on site and remotely when instrument operation is problematic, the SSEA also contributes to Refeyn’s internal knowledge sharing, by maintaining good documentation of service issues, instrument usage, and application space. Our goal is to keep customers happy, instruments performing up-to-spec, and learn from our customers what new services we can provide for even more value in their research needs.


  • Perform annual preventative maintenance visits on installed instruments
  • Repair instruments both on customer sites and in-house within the required timeframe
  • Assist with instrument installations and AutoMP retro-fits 
  • Contribute to service documentation and procedures
  • Work with manufacturing and R&D teams to improve instrument reliability
  • Contribute to service data collection 
  • Assist with service stock management 
  • Data and record keeping for installed instruments
  • Work with the manufacturing team to ensure instruments are delivered to the customer on time
  • Occasional support for manufacturing team
  • Approximately 60% travel will be required for this role as well as some international travel 

Candidate requirements:

  • MSc/PhD in a relevant field (Physics, Engineering etc.
  • Working in a laboratory requiring PPE and the handling of sensitive scientific equipment 
  • Experience troubleshooting complex scientific equipment 
  • Experience with electronic assemblies and/or optical systems
  • Software troubleshooting
  • Experience with liquid-handling robots
  • Experimental experience with proteins, DNA or other biomolecules 


  • Competitive salary according to experience; 25 days PTO plus 10 paid holidays; 5% company match to 401(k); comprehensive benefits package including medical, dental, vision, life insurance, and more


Refeyn is committed to being an equal opportunities employer. We are working hard to create a safe and empowering environment for all, and firmly believe that there is great strength in building teams with different voices, experiences, perspectives and backgrounds. We welcome applicants from all sections of society to join us on our mission to transform analytical workflows using the power of light. 

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