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Senior Software Engineer

BillionToOne

$193,800 - $214,200
Dec 24, 2025
Menlo Park, CA, US
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BillionToOne is looking to develop and scale personalized genomic medicine to millions of patients through robust software engineering.

Requirements

  • 5+ years of professional software development experience with a proven track record of delivering complex projects and adhering to best practices
  • Expertise in Python backend frameworks (e.g., Django or Flask), delivering high-quality, scalable code
  • Strong foundation in cloud services, preferably AWS, including ECS, S3, AWS Batch, EC2, and AWS Lambda, enabling effective architecture and management of complex systems
  • Experience in healthcare-related software or a passion for improving healthcare systems
  • Familiarity with healthcare data standards, such as FHIR and HL7
  • Experience with medical software and authoring technical verification / validation reports
  • Experience with technologies such as Postgres, Alpine.js, HTMX, Salesforce

Responsibilities

  • Collaborate with talented engineers to design and develop backend services, data processing pipelines, and interfaces
  • Build user-facing backend features to optimize performance and reliability, enhancing overall user experience
  • Elevate BTO Oncology’s backend systems, including the test order record database, third-party integrations, test scheduling and reports management software, and distributed systems architecture
  • Prioritize quality by writing comprehensive unit / integration / end-to-end tests and ensuring superior test coverage across all components and modules
  • Demonstrate a strong sense of ownership and take responsibility for end-to-end project delivery
  • Collaborate cross-functionally, actively seeking input from team members and fostering a positive and inclusive work environment
  • Build a seamless digital experience so clinicians and patients across a diversity of care centers and socioeconomic status can have access to BillionToOne’s highly complex genetic testing

Other

  • Excellent communication and collaboration skills, with the ability to work effectively in a team-oriented environment
  • Proven track record of building products and features from conception to deployment, showcasing your ability to innovate and deliver results
  • Excited about working in-person with our team in Menlo Park
  • Multiple medical benefit options; employee premiums paid 100% of select plans, dependents covered at 80%
  • Extremely generous Family Bonding Leave for new parents (16 weeks, paid at 100%)
  • Retirement savings program including a 4% Company match
  • Free daily on-site lunches provided from top eateries
  • Latest and greatest hardware (laptop, lab equipment, facilities)
  • A variety of perks on campus (state of the art gym, restaurant)
  • Free on-site EV charging (compatible with all EVs, including Tesla)