Senior Fullstack Engineer

Bios Life; Cambridge (MA); On-site; USD 120,000 - 160,000; Full time

Job summary

Bios Life is seeking an experienced mobile engineer to independently deliver patient-facing features across a React Native app and supporting backend services. You will own full vertical slices, coordinating UI, GraphQL integration, and backend updates, with a focus on accessibility, security, and production readiness.

Responsibilities include building high-quality patient workflows, reducing crashes, and extending backend models and APIs while maintaining sound architecture and CI/CD

Qualifications

• 4 to 7+ years of experience building and shipping production software.
• Strong production experience with React Native and GraphQL.
• Secure application development and data handling.
• Experience with accessibility in mobile apps.
• Strong TypeScript skills and UI/UX sensibility.

Responsibilities

• Deliver complete patient-facing features from concept to release across React Native app and backend services.
• Own full vertical slices of work including UI, GraphQL integration, backend updates, loading and error states.
• Build and ship workflows such as appointment scheduling, care plan tracking, messaging, and core experiences.
• Improve app quality by reducing crashes, improving latency, and implementing monitoring and logging.
• Extend backend models and GraphQL APIs as needed for features.

Skills

React Native

GraphQL

Security best practices

Accessibility

TypeScript

AI coding tools

Communication

Python

Django

Tools

Expo

EAS toolchain

CI/CD

Job description

KEY RESPONSIBILITIES

• Independently deliver complete patient-facing features from concept through implementation and release across the React Native mobile app and supporting backend services.
• Own full vertical slices of work, including UI implementation, GraphQL API integration, backend updates, loading states, error states, accessibility, and edge-case handling.
• Build and ship high-quality patient-facing workflows such as appointment scheduling, care plan tracking, messaging, and other core user experiences.
• Improve mobile application quality and stability by reducing crash rates, improving latency on critical flows, and implementing monitoring, alerting, error tracking, structured logging, and debuggability.
• Extend backend models and GraphQL APIs as needed to support product features while maintaining clean service boundaries and avoiding unnecessary technical debt.
• Ensure secure and compliant handling of sensitive patient data in all feature development, including safe logging, secure data handling, and alignment with HIPAA-conscious engineering practices.
• Contribute to internal clinical workflow tooling and backend services as business priorities shift.
• Work within the architecture established by the Staff App Engineer while identifying and raising opportunities to improve delivery speed, user experience, and technical quality.
• Strengthen day-to-day engineering practices through high-quality code, testing, thoughtful pull request reviews, pairing, and practical improvements to CI/CD and developer experience.
• Partner effectively with product, design, and engineering stakeholders to deliver polished, reliable, patient-facing experiences.

QUALIFICATIONS

• 4 to 7+ years of experience building and shipping production software, with the ability to independently deliver high-quality end-to-end features.
• Strong production experience with React Native, including navigation, state management, platform-specific behavior, performance debugging, and shipping mobile features in a production environment.
• Experience working across the full stack, including React Native on the frontend and GraphQL plus backend services on the server side.
• Ability to consume GraphQL effectively on the client side and extend backend schemas, resolvers, and data models when required for feature delivery.
• Strong understanding of secure application development, including encryption, secure storage, access controls, audit logging, safe handling of sensitive data, and thoughtful evaluation of third-party dependencies.
• Ability to build complete user-facing features that account for accessibility, usability, loading behavior, edge cases, and production readiness.
• Experience working in a fast-moving, startup or greenfield environment with evolving requirements and limited process overhead.
• Strong communication and collaboration skills, including the ability to explain tradeoffs clearly and work effectively with engineers and non-technical stakeholders.
• Demonstrated ownership, follow-through, and pragmatic decision-making, including knowing when to ask for guidance and when to move quickly with imperfect information.
• Experience using AI coding tools as a regular part of the development workflow while maintaining strong engineering judgment and code quality.

Preferred Qualifications

• Experience with Python/Django backend development.
• Familiarity with mobile CI/CD, app store submission, beta distribution, feature flagging, staged rollouts, and production monitoring.
• Experience implementing accessibility in React Native applications.
• Experience with Expo and EAS toolchain.
• Experience with offline-first mobile application patterns and data synchronization.
• Familiarity with FHIR resources or clinical data models.
• Strong TypeScript skills.
• Strong product and UI/UX sensibility.