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Sr. Software Engineer

Until

Salary not specified
Oct 10, 2025
San Francisco, CA, US
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Until is looking to solve the problem of organ-scale reversible cryopreservation and medical hibernation by developing a 'pause button' for biology, aiming to preserve donated organs at subzero temperatures without ice formation and rewarm them uniformly for transplant.

Requirements

  • Strong understanding of computer science fundamentals, including algorithms, operating systems, concurrency, memory management, and networking
  • Prior experience with backend development using frameworks such as Flask, FastAPI, or Django
  • Experience working with relational databases such as PostgreSQL, including schema design and query optimization
  • Strong experience with cloud infrastructure (AWS, GCP), including Infrastructure as Code tools such as Terraform
  • Familiarity with cloud security best practices, including identity and access management and network security
  • Proficient with developer tooling, including Linux command line, Git, and shell scripting
  • 3+ years of relevant professional experience developing modular, maintainable, and performant code in Python or a similar language

Responsibilities

  • Develop the computational and infrastructure backbone that enables our science to move faster
  • Build cloud infrastructure
  • Design database schemas
  • Develop internal tooling that forms the foundation of our internal scientific data platform
  • Own projects end-to-end
  • Collaborate across disciplines
  • Set a high bar for developing code that scales with the team

Other

  • Degree in Computer Science or a related field (Applied Mathematics, Statistics, Data Science)
  • Ability to think from first principles and tackle complex, cross-disciplinary problems with other scientists and engineers
  • Track record of owning software projects end-to-end
  • 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