Posted on:July 30, 2025

Scientist (Organ Perfusion) at Until

Until is hiring a Scientist (Organ Perfusion) in San Francisco, CA, US. On-site. Pay: USD 120k-150k/yr.

About Until

Until is developing reversible cryopreservation technology to preserve donated human organs at subzero temperatures without ice formation, then rewarm them for transplantation. The company aims to solve the donor organ procurement and matching problem, and is working toward whole-body reversible cryopreservation as a longer-term goal.

Scientist (Organ Perfusion) 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

We are seeking a Scientist to join our whole organ preservation team. You will apply your experience in perfusion, preservation, viability assessment and your passion for rapid protocol development to make successful large organ cryopreservation a reality.

You will have the opportunity to collaborate with scientists and engineers across the company on variety of methods inspired by first principles of biology, physics, and chemistry. Creative scientific engagement is a requirement of the role, and new avenues for discovery and optimization are continuously supported.

Responsibilities

Perform pig and rat organ isolation and ex-vivo evaluation protocols, including perfusion and histology

Protocol and assay development

Work within scientific team to evaluate health of organs following cryopreservation

Prepare equipment and supplies for experiments, including ordering and device maintenance

Ensure accurate sample processing and on-time data reporting

Qualifications

You have a graduate degree (Masters, PhD) in biology or other related field, or otherwise have significant experience (~3 years) with independent scientific discovery in an industry setting.

You have demonstrated a passion for rapid problem solving and exploration of novel topics / protocols.

Desire to work in a laboratory setting.

You demonstrate agency, problem solving, passion for discovery, and a drive to push the boundaries of science through meaningful involvement in an ambitious project.

Benefits

Opportunity for outsized impact creating the future as an early team member

Generous medical, dental and vision insurance coverage

Flexible time off and paid holidays

Competitive compensation package, including salary and equity

401(k) retirement savings plan

FSA and commuter benefits

Subsidized lunch daily

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.

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