Full-Time
Machine Learning Engineer / Scientist
UntilLabs
51-200 employees
Advances reversible organ cryopreservation technology
Compensation Overview
$140k - $240k/yr
Oakland, CA, USA
In Person
 AI & Machine Learning (1) |
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- Degree in Computer Science or a related field (Applied Mathematics, Statistics, Data Science, Computational Biology).
- Excellent foundations in the mathematics that underlies machine learning, including linear algebra, probability, statistics, and calculus.
- Strong experience in modern machine learning approaches, such as representation learning, generative modeling, active learning, and bayesian optimization.
- Track record of developing ML approaches for scientific discovery, as evidenced by a strong publication record, substantial open source contributions, or deployment of a machine learning system in an industry role.
- Demonstrated ability to write modular, maintainable, and performant code in Python.
- Fluency with the Python data science and ML stack, including PyTorch, NumPy, SciPy, Pandas/Polars, Matplotlib/Plotly.
- Proficient with developer tooling, including Linux command line, Git, and shell scripting.
- Ability to think from first principles and tackle complex, cross-disciplinary problems with other scientists and engineers.
- Own projects end-to-end including shaping data collection and designing data pipelines, training and evaluating models, and deploying tooling that scientists use daily.
- Build high-leverage ML systems that help develop new cryoprotectant formulations, engineer biologically-inspired antifreeze proteins, and understand the physics of vitrification and rewarming.
- 3+ years of relevant professional or research experience, or a PhD in a computational field.
- Strong understanding of computer science fundamentals, including algorithms, operating systems, and concurrency.
- Experience with cloud infrastructure (AWS, GCP) and SQL databases.
UntilLabs develops reversible cryopreservation technology to extend the viability of human organs for transplantation. The goal is to keep organs alive at cryogenic temperatures long enough to improve organ matching and reduce waste from time limits, potentially weeks or months of preserved time. The approach uses cooling to very low temperatures (below -130°C) with cryoprotectants to prevent ice damage, followed by advanced warming methods to revive the organs without harm. While cryopreservation has worked for cells and simple tissues, UntilLabs works on scaling this to whole organs, tackling challenges like ice formation and nutrient/waste management in large tissues. In the long term, the company envisions whole-body reversible cryopreservation as a bridge to future medical cures.
Company Size
51-200
Company Stage
N/A
Total Funding
N/A
Headquarters
San Francisco, California
Founded
2024
Simplify's Take
What believers are saying
- Raised $58M Series A in September 2025 from Founders Fund, Lux Capital, Field Ventures.
- Enables organ banking, better matching, reduces waitlist deaths from time constraints.
- Foundational for whole-body preservation, backed by over $100M funding.
What critics are saying
- FDA lacks approval framework, delaying commercialization 3-5 years.
- Normothermic systems from OrganOx, Transmedics capture market pre-approval.
- Cryoprotectant toxicity triggers rejection, forces redesign in 24-36 months.
What makes UntilLabs unique
- Until Labs develops reversible cryopreservation for organs using vitrification without ice formation.
- Engineers five dimensions: perfusion, cryoprotectants, cooling, rewarming, and post-thaw assays.
- Progressed from neural slices to preclinical kidneys, hearts, lungs, livers.
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Benefits
Health Insurance
Dental Insurance
Vision Insurance
Flexible Work Hours
Paid Holidays
401(k) Retirement Plan
Health Savings Account/Flexible Spending Account
Commuter Benefits
Professional Development Budget
Company News
Until Labs announced a $58 million Series A funding round led by Founders Fund, with Lux Capital and Field Ventures participating. The company focuses on developing technology for organ-scale reversible cryopreservation, allowing donor organs to be preserved indefinitely and rewarmed for transplant. The funding will help expand their multidisciplinary team to enhance their cryopreservation methods, aiming to improve organ matching and reduce organ waste.
Fenwick represents Until Labs in $58M Series A funding.