Principal Software Engineer

This is where your work makes a difference. At Baxter, we believe every person - regardless of who they are or where they are from - deserves a chance to live a healthy life. It was our founding belief in 1931 and continues to be our guiding principle. We are redefining healthcare delivery to make a greater impact today, tomorrow, and beyond.

Our Baxter colleagues are united by our Mission to Save and Sustain Lives. Together, our community is driven by a culture of courage, trust, and collaboration. Every individual is empowered to take ownership and make a meaningful impact. We strive for efficient and effective operations, and we hold each other accountable for delivering exceptional results. Here, you will find more than just a job-you will find purpose and pride.

The Principal Software Engineer (Mobile) is a hands-on technical leader responsible for the design, development, and evolution of mobile applications supporting both iOS and Android platforms using React Native with a background insecure voice calling.

• Lead the architecture, development, and enhancement of Mercury mobile applications using React Native for iOS and Android.
• Design and implement secure voice calling capabilities across iOS and Android.
• Integrate Mercury mobile applications with real-time communications services.
• Address mobile voice concerns including call signaling, session lifecycle, audio routing, connectivity changes, permissions, notifications, background behavior, and call reliability.
• Ensure functional parity and a consistent user experience across both mobile platforms.
• Collaborate with backend, web, UX, QA, cybersecurity, regulatory, and product stakeholders.
• Design and implement integrations using REST APIs, Web Sockets, SignalR, and real-time voice communication technologies.
• Apply HIPAA-aligned security practices for data handling, authentication, voice communications, messaging, and notifications.
• Participate in Agile development ceremonies and work tracking using JIRA and Confluence.
• Contribute to design controls, requirements traceability, verification, and validation documentation using JAMA.
• Perform rigorous code reviews and champion mobile engineering best practices.
• Mentor engineers and raise the overall quality and consistency of mobile development.
• Support production readiness, monitoring, troubleshooting, and issue resolution in live healthcare environments.

• Bachelor’s degree in Computer Science, Software Engineering, or a related discipline and 5+ years of professional software engineering experience, including significant mobile application development experience.
• Proven expertise with React Native and modern JavaScript/Type Script development.
• Strong experience developing for both iOS and Android platforms.
• Strong experience integrating mobile applications with backend systems using REST APIs and real-time communication technologies.
• Experience designing or supporting mobile voice calling, VoIP, WebRTC, or comparable real-time communications functionality.
• Experience with mobile audio behavior, call state management, operating-system permissions, push notifications, and background execution.
• Experience working in regulated environments, preferably healthcare or life sciences.
• Proficiency with Git Hub, PostgreSQL at the application consumption or interaction layer, and collaborative development workflows.

• Hands-on experience integrating mobile applications with real-time communications platforms.
• Experience with WebRTC, SIP, VoIP, media sessions, call signaling, or voice gateway integrations.
• Experience building secure communication, clinical communication, messaging, or alerting applications.
• Familiarity with iOS and Android…