---
title: 'Lab Technician at Until'
canonical: 'https://feeny.ai/job/lab-technician-until-san-francisco-85pf3399p5m3'
type: 'job'
last_seen: '2026-11-02'
---

# Lab Technician at Until

- **Company:** Until
- **Location:** San Francisco, CA
- **Compensation:** $70k–$90k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-09-21
- **Last confirmed live:** 2026-11-02
- **Apply:** https://jobs.lever.co/until/5f5e1673-87ee-44c0-88d7-7b54ada97444

## 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 motivated and detail-oriented Lab Technician to support recombinant protein production and media, buffer, and solution preparation within the Molecular Development team. The role includes expressing and purifying proteins using bacterial and yeast systems, performing routine protein quality-control analyses, and maintaining accurate sample and batch records.

The technician will also receive training in routine mammalian cell handling and maintenance. This position is well suited to someone who enjoys hands-on laboratory work, follows protocols carefully, and takes pride in consistent, reproducible results.

Work Schedule

This is an on-site role. The regular schedule includes at least two later-start, later-finish workdays per week to support time-sensitive laboratory workflows. These are shifted workdays rather than routinely extended days, coordinated in advance with the team.

Key Responsibilites:

- Express recombinant proteins in E. coli and yeast using established protocols, including culture preparation, growth, induction, and harvesting.

- Purify proteins using affinity chromatography, concentration, and buffer exchange.

- Assess protein concentration, yield, and purity using SDS-PAGE and protein concentration assays.

- Prepare and replenish culture media, buffers, stock solutions, and experimental reagents, including accurate weighing, dilution, pH adjustment, and sterilization as appropriate.

- After training, handle and maintain mammalian cells, including thawing, media changes, passaging, cell counting, viability assessment, and cryopreservation.

- Monitor cell morphology, confluency, and culture health; follow aseptic practices and promptly report contamination or unexpected results.

- Label, store, and track proteins, reagents, and cell stocks, maintaining clear records of preparation, production, quality control, and cell maintenance.

Required Qualifications:

- Bachelor’s degree in Biology, Biochemistry, Bioengineering, Molecular Biology, Chemistry, or a related field.

- At least two years of hands-on laboratory experience, including relevant academic research, internships, or industry experience.

- Hands-on experience with molecular biology and protein purification.

- Familiarity with SDS-PAGE, protein concentration assays, accurate pipetting, solution preparation, and routine laboratory calculations.

- Familiarity with aseptic technique, laboratory safety, and contamination-control practices.

- Strong organization, attention to detail, and documentation skills, with the ability to follow protocols, coordinate multiple tasks, and communicate deviations.

Preferred Qualifications:

- Experience expressing recombinant proteins in both E. coli and yeast.

- Experience with chromatography systems.

- Experience with larger-scale protein production and batch control.

- Experience with routine mammalian cell handling and maintenance.

- Candidates with strong protein-production experience who are interested in learning these techniques are encouraged to apply.

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.

## About Until

## Company Overview
- **One-liner**: Until is building reversible cryopreservation technology to bank whole human organs, extending viability from hours to weeks or months, with the long-term goal of whole-body cryopreservation.
- **Entity Type**: Private (Privately Held)
- **Headquarters**: San Francisco, California, United States
- **Founded**: 2025
- **Founders**: Laura Deming (CEO, Co-founder) and Hunter Davis Ozawa (CSO, Co-founder)

## Core Business
- Primary industry/industries: Biotechnology Research, Cryopreservation, Organ Preservation, Hibernation Science
- Target customers: Organ procurement organizations, transplant hospitals, and ultimately patients waiting for organ transplants (B2B with healthcare institutions)
- Mission or purpose statement: "Pressing pause on biological time, for those who need it most." The company aims to solve the organ procurement and matching problem by making donated organs last long enough to reach any patient in need.

## Products & Services
- **Reversible Cryopreservation for Whole Organs**: A technology that cools organs to -130°C using biocompatible cryoprotectants, then rewarms them without damage, turning hours of viability into weeks or months.
- **Cryoprotectant Discovery Engine**: A platform combining physics simulations and machine learning to screen over 250,000 candidate molecules for cryoprotective formulations that stay within a "Biocompatibility Budget" – preventing ice formation without harming cells.
- **Hibernation Research**: Exploratory work on inducing reversible metabolic arrest (hibernation-like states) in organisms, with potential applications in organ preservation and future whole-body suspension.

## Market Standing
- **Valuation/Market Cap**: Not publicly available (private company, founded 2025)
- **Key Metric**: Total Funding – Not disclosed; headcount of 53 employees (as of early 2026) with 9.5% monthly growth and 29 active job postings.
- **Notable Investors/Partners**: Not publicly listed. The company is co-founded by Laura Deming, a noted longevity and biotech investor (founder of the Longevity Fund), which may signal strong investor connections.
- **Growth Signals**: Rapid hiring (29 open roles for a 53-person team, +31.8% quarterly job posting growth), high-throughput screening scale (2,903 formulations tested in Q2 2026 alone), and public progress on cryoprotectant discovery.

## Competitive Advantages
- **Combination of Physics Simulation and ML**: Their discovery engine screens millions of molecules in silico before wet-lab validation, dramatically accelerating cryoprotectant development.
- **Biocompatibility Budget Framework**: A novel approach that distributes cryoprotectant toxicity across multiple mechanisms, avoiding the single-dose toxicity that has stymied the field for 50 years.
- **Focus on Whole Organs (not just cells)**: Extending cryopreservation from small samples (IVF, stem cells) to whole human organs – a much harder problem with massive clinical impact.
- **Talent Philosophy**: "Proof of work" culture that hires for demonstrated ability over credentials, with fast promotion for those who earn it.

## Strategic Focus
- **Immediate**: Scale up cryoprotectant discovery and validation to achieve reversible cryopreservation of a whole human organ (likely a kidney or heart) within the next few years.
- **Medium-term**: De-risk and build the foundation for whole-body reversible cryopreservation, enabling "a bridge to future cures" for patients with currently incurable conditions.
- **Talent Acquisition**: Aggressively hiring scientists, engineers, and operations staff across physics, biology, chemistry, and engineering disciplines to accelerate R&D.

## Why Work Here
- **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.

## Sources
1. [untillabs.com/careers](https://www.untillabs.com/careers)
2. [untillabs.com](https://untillabs.com/)
3. [untillabs.com/our-team](https://www.untillabs.com/our-team)
4. [builtin.com/company/until-labs](https://builtin.com/company/until-labs)
5. [jobs.lever.co/until](https://jobs.lever.co/until)

## Other roles at Until

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- [Engineer, Rewarming Systems](https://feeny.ai/job/engineer-rewarming-systems-until-san-francisco-tswax2n4d0ca) — San Francisco, CA
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