Sr. Mechanical Engineer, Fluidics/Perfusion Engineering Bay Area Bay Area Full-time 150000 - 210000 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. 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. As an equal opportunity employer, Until is committed to providing employment opportunities to all individuals. All applicants for positions at Until will be treated without regard to race, color, ethnicity, religion, sex, gender, gender identity and expression, sexual orientation, national origin, disability, age, marital status, veteran status, pregnancy, or any other basis prohibited by applicable law. 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

Benefits

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

Subsidized lunch daily

Jobs

No opportunities available

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