Sensing & Instrumentation Engineer

About the Company 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're looking for fast-moving, hands-on engineers and physicists with strong fundamentals, high autonomy, and a desire to make technology that feels impossible until it works. Organ systems perform millions of complex, regulated biochemical operations every second. Your kidneys filter over 150 L of fluid per day, reabsorb over 99% of the filtrate, and hold blood pH within a tolerance of 0.

1. Every drop of blood travels a fraction of the body's ~60,000 miles of vessels, through capillaries so narrow that your ~25 trillion red blood cells must fold themselves to pass through and deliver their oxygen. At Until, we're building the technology to bring all of this to a full stop and start it again. Understanding exactly how this machinery responds to cryopreservation takes a new toolkit: optics, photonics, chemistry, electrical engineering, and organ science.

Work here runs across the entire engineering stack, from sensing physics at the tissue interface, to analog front ends and ADCs that pull faint signals out of noise, and the FPGAs that orchestrate instruments in real time. If you want to build biological sensing and actuation from scratch while opening a new window into organ dynamics, this is the role for you.