Mechanical Engineering, Design

Until; San Francisco (CA); On-site; USD 120,000 - 170,000; Full time

Benefits offered by this job

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

Job summary

Until, located in San Francisco, is looking for a Mechanical Engineer to lead the design of critical hardware for organ preservation technologies. This role involves end-to-end design from concept to prototype, requiring exceptional engineering skills and a proactive approach.

The ideal candidate has over 3 years of relevant experience and is proficient in modern CAD and prototyping techniques. Competitive compensation, including salary and equity, and impressive benefits are offered.

Qualifications

• Track record of exceptional engineering abilities.
• Ability to spec a system based on first principles and optimize for manufacturing.
• Desire to join a fast‑paced engineering team.

Responsibilities

• Designing heat exchangers and clinical grade perfusion devices.
• Developing systems from sketch to final part with minimal direction.

Skills

Engineering abilities

DFM

CAD

FEA (Fusion 360 Preferred)

Rapid prototyping

CNC machining

Laser cutting

Education

3+ years experience/graduate level in Mechanical Engineering or equivalent

Job description

Overview

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

$120,000 - $170,000 a year

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.