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Sr. Mechanical Engineer, Design

Until.com

Office

Bay Area

Full Time

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 RoleThe 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
  • 6+ 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 optimize for manufacturing
  • Desire to join a fast-paced, scrappy engineering team

Preferred Qualifications

  • Experience leading highly technical, multidisciplinary teams
  • Class III Medical Device experience
  • Industrial Design & Engineering Experience

Sr. Mechanical Engineer, Design

Office

Bay Area

Full Time

October 17, 2025

Until.com

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