Mechanical Engineering, Design

Until

Until

Other Engineering, Design

San Francisco, CA, USA

USD 120k-170k / year + Equity

Posted on Jun 3, 2026
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
The hardware we need to accomplish our mission does not exist, so we must make it ourselves. As a mechanical engineer spearheading our mechanical design efforts, you'll be tasked with designing everything from heat exchangers to clinical grade perfusion devices.

About You

  • Track record of exceptional engineering abilities, with an emphasis on shipping completed systems from sketch to final part with minimal outside direction
  • 3+ years experience/graduate level in Mechanical Engineering or equivalent
  • Highly proficient in DFM, CAD, FEA (Fusion 360 Preferred)
  • Highly proficient with common rapid prototyping and manufacturing processes (especially multiple additive methods, CNC machining and laser cutting)
  • Ability to spec a system based on first principles, design it, perform component selection, prototype, and then optimize for manufacturing
  • Desire to join a fast-paced, scrappy engineering team

Preferred Qualifications

  • Class III Medical Device experience
  • Industrial Design & Engineering Experience

Benefits:

  • Generous medical, dental and vision insurance coverage

  • 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

  • Daily lunch and dinners, plus a variety of snacks

  • Monthly learning stipend

  • On-site fitness center

  • Quarterly team social budget



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.

120000 - 170000 USD a year

While this represents our expected range based on market data, final compensation will be determined based on your specific qualifications and may be outside this range. Please keep in mind that the equity portion of the offer is not included in this estimate.
See more open positions at Until