React Native Developer W/ EXPO and NEXT Js experience

Job Title: Senior Lead Engineer - React Native

Location: Framingham, MA

Duration: 6 months

Primary Skills: React Native, TypeScript, Expo, and modern mobile architecture, Swift, Kotlin, Jest, React Native Testing Library, Detox

Description:

We''re looking for a Senior Engineer - React Native with deep experience designing and building scalable, high-performance mobile applications using React Native, TypeScript, Expo, and modern mobile architecture patterns. This role will play a critical part in shaping the technical direction of our mobile platform, driving architecture decisions, optimizing performance, and delivering enterprise-grade mobile experiences.

You''ll work closely with Engineering, Product, Design, Backend, and DevOps teams to build highly responsive, secure, and maintainable iOS and Android applications. We''re seeking someone who can operate strategically while remaining hands-on — someone who enjoys solving complex mobile challenges while influencing long-term platform evolution.

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What You''ll Be Doing

·        Provide technical leadership and oversee the daily mobile engineering operations.

·        Define and drive the mobile architecture strategy aligned with business goals.

·        Lead the design and development of scalable, high-performance mobile applications using React Native and TypeScript.

·        Architect modular, reusable component systems and scalable state management solutions (Redux, Zustand, Context API, etc.).

·        Design clean navigation, deep linking, and mobile routing strategies (React Navigation, Expo Router).

·        Implement secure authentication flows (OAuth/OIDC, biometrics, secure storage, token lifecycle management).

·        Drive native module integrations (Swift, Kotlin) for SDKs such as payments, fraud detection, analytics, push notifications, and device security.

·        Optimize mobile performance (startup time, bundle size, memory usage, rendering performance, offline caching).

·        Establish CI/CD pipelines for mobile (Fastlane, EAS Build, App Store Connect, Google Play Console).

·        Lead app release management, versioning strategy, and store compliance.

·        Ensure adherence to mobile security best practices, privacy compliance, and accessibility standards.

·        Partner with backend teams to define API contracts and optimize mobile-backend interactions.

·        Champion automated testing (Jest, React Native Testing Library, Detox) and code quality standards.

·        Mentor engineers and foster a culture of ownership, craftsmanship, and continuous improvement.

·        Participate in architecture reviews and roadmap planning for long-term mobile platform scalability.

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What You Bring to the Table

·        Strong hands-on experience building production-grade apps using React Native and TypeScript.

·        Deep understanding of Expo ecosystem (EAS, OTA updates, build pipelines, native configuration).

·        Expertise in mobile architecture patterns (Clean Architecture, MVVM, modular architecture).

·        Experience integrating native iOS (Swift) and Android (Kotlin) modules into React Native apps.

·        Strong understanding of app lifecycle, memory management, threading, and performance tuning.

·        Experience implementing push notifications, deep linking, analytics SDKs, and mobile security frameworks.

·        Familiarity with authentication flows (OIDC, PKCE, secure token handling).

·        Experience with API integrations (REST, GraphQL) and handling network resiliency/offline-first design.

·        Strong understanding of mobile DevOps, CI/CD, and release governance.

·        Experience collaborating in Agile environments and influencing cross-functional stakeholders.

·        Ability to balance hands-on development with strategic architectural leadership.

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Basic Qualifications

·        Bachelor''s or Master''s degree in Computer Science, Engineering, or related field (or equivalent experience).

·        10 years of software development experience.

·        6 years of hands-on mobile development experience.

·        4 years leading React Native applications in production environments.

·        Proven experience delivering apps to both Apple App Store and Google Play Store.

·        Experience working with cloud-based backends (Azure, AWS, or Google Cloud Platform).

·        Strong experience with CI/CD pipelines, automated testing, and DevOps best practices.

·        Demonstrated leadership experience mentoring engineers and guiding technical direction.

·        Strong problem-solving skills with the ability to make strategic architectural decisions balancing business and technical needs.