Principal Software Engineer (Backend)

Onos Health • San Francisco, CA

86d

About The Position

Onos Health’s mission is simple but ambitious: ensure every healthcare dollar goes toward delivering the highest quality care. Today, 30% of total U.S. healthcare spending is wasted due to ineffective care and administrative burden caused by misalignment between providers and payers. Onos is addressing this by building the largest AI-driven healthcare data platform. Our models enable payers to make faster, more accurate decisions across their populations. By guiding members to the right care, Onos is channeling more dollars to high-quality care that drives outcomes while making healthcare more affordable. Onos recently closed a $6M Seed round with top-tier investors and is already working with some of the nation’s largest health plans, signing its first national plan just months after launch. Come join a category-defining company and help reimagine healthcare for the better.

Requirements

• 5+ years experience building robust and well-architected software applications
• Customer obsessed and motivated to make an impact in the healthcare space
• Expertise with data engineering and backend web development practices
• A hands-on leader and collaborative team player with an attention to the details

Nice To Haves

• Significant experience working with healthcare data and with HIPAA best practices
• Worked with machine learning and large language models for end-user applications
• Built and managed teams of engineers on major software projects

Responsibilities

• Architecting and implementing major platform components to provide actionable insights and recommendations to health plan administrators
• Develop robust integrations with health care systems and build scalable data pipelines for health records, provider directories, and claims processing
• Work closely with ML/LLM engineers to build and optimize models for behavioral and mental health
• Establish engineering best practices and technical foundations for future team growth
• Shape our technical roadmap, make key architectural decisions, and influence the company's product strategy

Benefits

• Flexible hybrid arrangement: 1-2 days/week at San Francisco office (financial district), remote-first culture
• Unlimited vacation policy
• Paid parental leave
• Medical, dental, and vision insurance
• Pre-tax commuter benefits
• 401(k)
• Significant equity as an early employee
• Ground-floor opportunity to help build a team and culture
• Regular team events and offsites
• Company-provided equipment and home office setup

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level
• Number of Employees: 11-50 employees