Principal Software Engineer

How You'll Make An Impact

• Technical Leadership & Problem Solving
• Serve as the go-to engineer for diagnosing and solving cross-cutting technical issues (e.g., Terraform/Terragrunt deployment failures, concurrency bugs, device/app compatibility, caching, CI/CD bottlenecks).
• Ensure backend and infrastructure meet reliability, scalability, and security needs, working in partnership with the backend/infra engineer. Step in when deep debugging or architectural decisions are required.
• Ensure frontend meets performance and compatibility requirements across a wide range of iOS and Android devices, working in partnership with the frontend engineer. Step in when issues arise with device hardware differences (e.g., cameras), caching, or OS-level changes.
• Guide the integration of on-device ML algorithms (e.g., TensorFlow Lite, CoreML, PyTorch) developed by our data science team, ensuring they are efficiently packaged, deployed, and monitored in production apps.
• Collaborate with QA to build robust testing strategies that capture integration issues across frontend, backend, and device ecosystems.
• System Cohesion & Architecture
• Collaborate with the Director of Software on system design and technical strategy, ensuring that frontend, backend, and infra components fit together cleanly.
• Provide guidance and oversight so features are implemented in a way that is scalable, testable, and maintainable.
• Establish standards and best practices for coding, testing, deployment, monitoring, and security across the team.
• Develop and maintain written procedures and documentation for software development, deployment, and maintenance to support continuity, quality, and regulatory compliance.
• Collaboration & Mentorship
• Mentor engineers (frontend, backend/infra, QA) to raise the technical bar and encourage a culture of problem ownership.
• Act as the technical bridge between software and the broader R&D team (assay scientists, hardware engineers, product managers).
• Contribute to regulatory compliance efforts (IEC 62304:2006 for medical device software).

On Your First Day We'd Like You to Have

• Bachelor’s or Master’s in Computer Science, Software Engineering, or related field (or equivalent hands-on experience).
• 7+ years of experience in software engineering, with significant full-stack exposure.
• Proven track record of diagnosing and fixing complex system issues across frontend, backend, and infrastructure.
• Flutter/Dart for mobile development (iOS/Android).
• Kotlin or Java backend development.
• Cloud platforms (GCP preferred).
• Infrastructure-as-code (Terraform/Terragrunt).
• Kubernetes and containerized deployments.
• CI/CD pipelines and release engineering.
• Modern database systems (relational and non-relational).
• Proven experience ensuring mobile application performance and compatibility across diverse iOS and Android devices, including expertise in handling camera hardware/software differences, caching strategies, and OS-level changes.
• Exposure to ML/AI integration, with an understanding of how to package, deploy, and monitor models as part of a production software system.
• Experience working in or adjacent to regulated industries (healthcare, medical devices, fintech) a plus.

It's Great If You Have

• Experience with mobile camera APIs and optimization techniques for consistent performance across device generations.
• Familiarity with medical device software standards (IEC 62304:2006).
• Experience with Firebase services (e.g., Firestore, Auth, Crashlytics).
• Knowledge of security best practices for mobile and cloud applications.
• Prior experience in small, high-growth startups.

About The Team

• You will join a small, high-performing R&D software team consisting of a frontend engineer, backend/dev ops engineer, and QA engineer, alongside a fractional Director of Software. With our product already FDA-cleared and commercially available, your role will be to help stabilize, scale, and harden our systems for widespread deployment. You will provide senior-level technical guidance and hands-on problem-solving capacity to ensure our software remains reliable, scalable, and adaptable as we grow.

Salary Range

• 180,000-200,000 (salary range for candidates based in San Jose, CA)
• Compensation for the role is based on geographical location. 
• Compensation also depends on a number of factors including a candidate’s qualifications, skills, competencies and experience and may fall outside of the range shown.