Sr. Mechanical Engineer, Fluidics/Perfusion Bay Area - - On-site

Until Labs; Northern (KY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Medical, dental, vision insurance

Equity

401(k) retirement plan

Flexible time off

Job summary

Until Labs is seeking a Sr. Mechanical Engineer focused on Fluidics and Perfusion to advance organ-scale perfusion systems and cryopreservation hardware. You will push the boundaries of heat and mass transfer in N-of-1 perfusion devices, joining a fast-paced, scrappy team that values autonomy and technical excellence.

The role requires leading multidisciplinary teams and delivering electromechanical designs, control software interfaces, and physical models for next-gen perfusion technology.

Qualifications

• 4+ years or graduate level in Mechanical Engineering, Physics, or equivalent.
• Strong foundation in heat/mass transfer and fluidic design.
• Autonomy across electromechanical design, fabrication, and control software.

Responsibilities

• Lead development of perfusion and heat exchange hardware.
• Own engineering stack from concept to prototyping and testing.
• Collaborate with multidisciplinary teams to translate biology goals into robust systems.

Skills

Heat transfer

Fluid dynamics

Mechanics

Electromechanical design

Team leadership

Education

Bachelor's degree in Mechanical Engineering

Tools

SolidWorks

FEA

Job description

Sr. Mechanical Engineer, Fluidics/Perfusion

Until is a moonshot company building a “pause button” for biology. Our near-term focus is organ-scale reversible cryopreservation: preserving donated organs at subzero temperatures without ice formation, then rewarming them uniformly for transplant. By solving this grand challenge, we’re laying the foundation for whole-body reversible cryopreservation, giving patients a bridge to future cures.

To achieve our goal, we are assembling an interdisciplinary team to develop perfusion systems, cryoprotectant formulations, and vitrification and rewarming hardware.

We envision a future where no transplantable organ is lost to logistics, and no terminal diagnosis is final because patients can safely wait for future medicine to arrive.

About the Role

Accomplishing our mission requires skilled engineers pushing the boundary developing new systems for heat and mass transfer in N-of-1 perfusion and heat exchange devices. We're building a fast-paced, scrappy team of engineers to create technology indistinguishable from magic.

About You

• Track record of exceptional engineering abilities
• Experience leading highly technical, multidisciplinary teams
• 3+ years experience/graduate level in Mechanical Engineering, Physics, or equivalent
• Deep understanding of heat and mass transfer principles alongside fluidic design experience
• High degree of autonomy across full engineering stack: electromechanical design and fabrication, control software, physical modeling
• Desire to join a fast-paced, scrappy engineering team

Preferred Qualifications

• Experience with organ perfusion in a research or clinical context
• Experience working in a startup
• Opportunity for outsized impact creating the future as an early team member
• Generous medical, dental and vision insurance coverage for employees and their dependents
• Flexible time off and paid holidays
• Competitive compensation package, including salary and equity
• Access to a 401(k) retirement savings plan
• FSA and commuter benefits