Senior Software Engineer (Backend)

Senior Backend EngineerWe're seeking an experienced Senior Backend Engineer who is motivated to meaningfully improve the way healthcare is administered in the United States. You'll take ownership in helping develop a significant part of the Onos platform through hands-on development. This role is a hybrid role based in San Francisco, where you'll be expected to work at our office in person 2-3 times a week.What you'll be doing at Onos:Architect workflows that utilize AI/ML to process claims, medical records and other data types to evaluate the optimal care path for health plan membersLead the integration and rollout of the Onos platform for new enterprise customers to provide actionable insights and recommendations to health plan administratorsOwn end-to-end development of new features and functionality for the Onos platform, including requirements gathering, scoping, architecting, implementation and testing to deliver timely and high quality outcomesEstablish engineering best practices and technical foundations for future team growthShape our technical roadmap, make key architectural decisions, and influence the company's product and technical strategyTechnical Challenges At Onos:Develop an intelligent engine that ingests complex medical standards of care documents and evaluates provider adherence to guidelinesDesign and implement robust and extensible systems to easily support many different kinds of enterprise workflows and integrationsBuild AI/ML pipelines to analyze handwritten clinical notes, accurately extract important medical information, and automate recommendations for clinical reviewersScale our systems to process millions of healthcare records while maintaining strict security and compliance requirementsTech Stack:Infrastructure/Systems: AWS (ECS, Bedrock, Glue, etc.), Docker, Github Actions, TerraformLanguages/Frameworks: Backend: Python, Django, Celery / Celery Beat, django-ninja, django-tenantsFrontend: NextJS, Typescript, Tanstack Query, Shadcn UI, Zod, NuqsDatabase/Storage: PostgreSQL (AWS RDS), S3, ClickhouseDevelopment Tools: Github, Jira, Claude Code, CoderabbitAI, TuskWhat we're looking for:5+ years experience building software applicationsPrior experience leading engineering teams as a tech lead or engineering managerStrong product sense and system design skills with a track record of defining clear requirements, test scenarios, and acceptance criteria for complex systemsCustomer obsessed and motivated to make an impact in the healthcare spaceA hands-on technical leader who can architect robust and extensible systems, establish best practices with AI coding tools, and ship high quality production codeBonus points if you have:Worked with machine learning and large language models for end-user applicationsHands-on experience navigating healthcare data formats such as EDI X12, HL7, FHIR, and custom payer flat filesBenefits and Perks:Flexible hybrid arrangement: 2-3 days/week at San Francisco office (Financial District), remote-first cultureUnlimited vacation policyPaid parental leaveMedical, dental, and vision insurancePre-tax commuter benefits401(k)Significant equity as an early employeeDirect mentorship from experienced foundersGround-floor opportunity to help build a team and cultureRegular team events and offsitesCompany-provided equipment and home office setupWe are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.