Electrical Engineer / Applied Physicist Bay Area - - On-site

Until Labs; United States; Hybrid; USD 120,000 - 160,000; Full time

Benefits offered by this job

Medical coverage

Flexible time off

Competitive compensation including 401

FSA and commuter benefits

Lunch and dinners

Learning stipend

On-site fitness center

Team budget

Job summary

Until Labs is seeking an electrical engineer to design, build, and test high-power rewarming hardware for organ systems. You will work across power electronics, instrumentation, and control software to translate physics into reliable lab hardware.

You will reason from first principles, create test fixtures, analyze data, and bring up analog and digital circuitry from schematic to bench. A BS/MS in EE or Physics and hands-on experimentation are required.

Qualifications

• Strong command of circuit theory and physics (impedance, resonance, energy storage, electromagnetics, and heat transfer).
• Able to walk us through a project in depth: physics and math reasoning, and early mental model.
• Able to make order-of-magnitude estimates quickly and explain the intuition.
• Have designed, built, and debugged real analog and digital circuitry from schematic to bench and bring-up.
• Experience with basic control systems, instrumentation, data analysis, and hands-on experimental hardware.
• BS/MS in EE, Physics, or equivalent self-taught depth; demonstrated reasoning is valued over credentials.

Responsibilities

• Design, build, test, and debug electrical hardware for organ rewarming systems.
• Develop power converters, resonant matching networks, instrumentation, and control systems.
• Reason from first principles using circuit theory, electromagnetics, thermal physics and data to model system behavior and debug hardware issues.
• Build test fixtures, data acquisition systems, experimental setups, and control software for high-power hardware validation.
• Learn quickly, own ambiguous problems, and contribute across the full rewarming hardware stack.

Skills

Circuit theory

Physics

Impedance

Resonance

Electromagnetics

Heat transfer

First-principles modeling

Analog and digital circuitry

Data analysis

Control systems

Instrumentation

Hands-on hardware

Education

BS/MS in EE or Physics

Tools

Test equipment

Data acquisition systems

Control software

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

One of the key unsolved challenges in cryopreservation is the rewarming problem: how do we rapidly and uniformly rewarm whole organs and, ultimately, whole bodies to restart cryopreserved biology? One of the key ingredients is building first-of-its-kind electrical systems for delivering high power into complex biological loads.

We are looking for fast-moving, hands-on engineers and physicists with strong fundamentals, high autonomy, and a desire to build technology that feels impossible until it works. This role is for someone who is as comfortable deriving a back-of-the-envelope model from circuit laws, electromagnetics, and thermal physics as they are wiring up hardware in the lab.

What You'd Do:

Design, build, test, and debug electrical hardware for organ rewarming systems.

Develop power converters, resonant matching networks, instrumentation, and control systems.

Reason from first principles, using circuit theory, electromagnetics, thermal physics and measurement data, to model system behavior and debug ambiguous hardware problems

Build test fixtures, data acquisition systems, experimental setups, and control software for high-power hardware validation.

Learn quickly, take ownership of ambiguous problems, and contribute across the full rewarming hardware stack.

About You:

You have a strong command of circuit theory and physics (impedance, resonance, energy storage, electromagnetics, and heat transfer), and you reach for these instinctively when a piece of hardware isn’t behaving as expected.

You have a project you can walk us through in depth: not just what you built, but the physics and math reasoning that got you there, and where your first mental model was wrong.

You can make order-of-magnitude estimates quickly, and you can explain the physical intuition behind them clearly to someone else.

You’ve designed, built, and debugged real analog and digital circuitry, taking systems from schematic to bench and through bring-up.

You have experience with basic control systems, instrumentation, data analysis, and hands-on experimental hardware.

You have a BS/MS in EE, Physics, or equivalent self-taught depth; we care more about demonstrated reasoning ability than credentials.

We want to join a small, fast-paced team on an excellent adventure.

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