Until

Mechanical Engineering, Design at Until (Bay Area)

Until· Bay Area· $120k–$170k·

Role details

Salary
$120k–$170k
Work type
Onsite
Employment
Full-Time

Job description

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

Why work at Until

  • Work Environment: On-site in San Francisco (HQ). The work spans "the edge of physics, biology, and engineering" – from quantum-level simulations to handling real organs. Culture emphasizes "hard problems", rigor, and speed.
  • Culture: Flat hierarchy, promotion on merit, "proof of work" over credentials. Team includes people from top universities and self-taught scientists alike.
  • Benefits: Comprehensive medical/dental/vision, 401(k) via Guideline, unlimited PTO, paid parental and disability leave, on-site fitness center, catered lunch and dinner, plus snacks.
  • Engineering & Science: Opportunity to work on cutting-edge cryobiology, nanotech, polymer chemistry, and high-throughput automation. The company uses AI tools in hiring but makes final human decisions.

Application questions