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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 Senior Scientist, Cardiac Preservation to lead our heart preservation efforts within the whole organ preservation team. You will own a large domain and play a vital role in shaping how Until preserves, recovers, and assesses the viability of the heart through cryopreservation. Drawing on deep expertise in cardiac physiology and ex vivo heart perfusion, you will design and execute the experiments that make reversible cryopreservation of the heart a reality. You will collaborate with scientists and engineers across the company on approaches grounded in the first principles of biology, physics, and chemistry. Creative and highly independent scientific engagement is a requirement of the role, and new avenues for discovery and optimization are continuously supported.