Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I'm James Kennedy, a Senior Mobile Engineer with over a decade of experience in building high-performance cross-platform mobile apps. I enjoy working with React Native, Swift, Kotlin, and Java, creating seamless experiences for users on both iOS and Android platforms. I've had the chance to lead projects that make a real impact, like healthcare applications and fintech solutions. I'm passionate about collaborating with interdisciplinary teams to deliver scalable and maintainable apps. When I'm not coding, I enjoy exploring new technologies and designing intuitive UI/UX to make every app enjoyable and user-friendly.…Hi, I'm James Kennedy, a Senior Mobile Engineer with over a decade of experience in building high-performance cross-platform mobile apps. I enjoy working with React Native, Swift, Kotlin, and Java, creating seamless experiences for users on both iOS and Android platforms. I've had the chance to lead projects that make a real impact, like healthcare applications and fintech solutions. I'm passionate about collaborating with interdisciplinary teams to deliver scalable and maintainable apps. When I'm not coding, I enjoy exploring new technologies and designing intuitive UI/UX to make every app enjoyable and user-friendly.

James Kennedy

App Developer, Developer, Front-End Developer, +2





Hi, I'm James Kennedy, a Senior Mobile Engineer with over a decade of experience in building high-performance cross-platform mobile apps. I enjoy working with React Native, Swift, Kotlin, and Java, creating seamless experiences for users on both iOS and Android platforms. I've had the chance to lead projects that make a real impact, like healthcare applications and fintech solutions. I'm passionate about collaborating with interdisciplinary teams to deliver scalable and maintainable apps. When I'm not coding, I enjoy exploring new technologies and designing intuitive UI/UX to make every app enjoyable and user-friendly.…Hi, I'm James Kennedy, a Senior Mobile Engineer with over a decade of experience in building high-performance cross-platform mobile apps. I enjoy working with React Native, Swift, Kotlin, and Java, creating seamless experiences for users on both iOS and Android platforms. I've had the chance to lead projects that make a real impact, like healthcare applications and fintech solutions. I'm passionate about collaborating with interdisciplinary teams to deliver scalable and maintainable apps. When I'm not coding, I enjoy exploring new technologies and designing intuitive UI/UX to make every app enjoyable and user-friendly.

Available to hire

Hi, I’m James Kennedy, a Senior Mobile Engineer with over a decade of experience in building high-performance cross-platform mobile apps. I enjoy working with React Native, Swift, Kotlin, and Java, creating seamless experiences for users on both iOS and Android platforms. I’ve had the chance to lead projects that make a real impact, like healthcare applications and fintech solutions.

I’m passionate about collaborating with interdisciplinary teams to deliver scalable and maintainable apps. When I’m not coding, I enjoy exploring new technologies and designing intuitive UI/UX to make every app enjoyable and user-friendly.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Beginner

Language

English

Fluent

Work Experience

Senior Mobile Developer at Boston Consulting Group

June 30, 2025 - July 8, 2025

Led On/Go healthcare mobile app development to a cross-platform mobile solution for both iOS and Android using React Native and Redux Toolkit (RTK) within the MVVM architecture, facilitating rapid at-home COVID-19 testing and result tracking. Built core UI elements with JavaScript, implementing key features like real-time test result sharing, and leveraged Swift to build high-performance iOS-specific features, improving user engagement by 20%. Upgraded and maintained the FinTron fintech mobile app using React Native, TypeScript, and Git for version controlling, delivering an all-in-one platform for investing and banking to 10K+ clients. Implemented key features including Push Notifications through Firebase Cloud Messaging (FCM) for mobile security, managing sensitive data to protect user information and prevent unauthorized access to financial transactions. Contributed to backend development with Node.js, Express.js, and Web Sockets for secure user authentication and real-time data syn

React Native Developer at ChowNow

December 31, 2020 - July 8, 2025

Developed and maintained mobile apps as food ordering and delivery systems across iOS and Android using React Native, JavaScript, and TypeScript, delivering seamless food ordering experiences to 20K+ users. Implemented real-time delivery tracking with Firebase and Google Maps APIs, and integrated secure payment gateways, including Stripe facilitating smooth and reliable transaction processing. Executed comprehensive unit and integration testing using Jest and Detox, reducing post-release bugs by 40%. Collaborated with teammates in Agile Scrum methodology using communication tools like Slack and Jira.

Front End Developer at Robinhood

June 30, 2017 - July 8, 2025

Implemented core features of Robinhood fintech app using Swift and Java, including real-time stock data visualizations, trade execution interfaces, and user onboarding flows. Demonstrated expertise in performance optimization, ensuring seamless user interactions and efficient SPA development with React, Node.js, and JavaScript.

Senior Mobile Developer at Boston Consulting Group

June 30, 2025 - July 8, 2025

Led On/Go healthcare mobile app development as a cross-platform solution using React Native and Redux Toolkit within MVVM architecture, enabling rapid at-home COVID-19 testing and result tracking. Built core UI elements in JavaScript and enhanced iOS-specific features with Swift, boosting user engagement by 20%. Upgraded and maintained the FinTron fintech app for 10K+ clients using React Native and TypeScript, implementing push notifications for mobile security through Firebase Cloud Messaging. Contributed to backend development with Node.js, Express.js, and Web Sockets for secure authentication and real-time data synchronization. Built CI/CD pipelines using Jenkins and GitHub Actions to automate build, test, and deployment processes.

React Native Developer at ChowNow

December 31, 2020 - July 8, 2025

Developed and maintained cross-platform mobile apps for food ordering and delivery to over 20K users using React Native, JavaScript, and TypeScript. Implemented real-time delivery tracking with Firebase and Google Maps APIs and integrated secure payment gateways including Stripe. Executed unit and integration testing with Jest and Detox, reducing bugs by 40%. Collaborated within Agile Scrum teams using Slack and Jira for communication.

Front End Developer at Robinhood

June 30, 2017 - July 8, 2025

Implemented core features for the Robinhood fintech app using Swift and Java, including real-time stock data visualizations, trade execution interfaces, and user onboarding flows. Optimized app performance ensuring seamless user interaction and efficient SPA development with React, Node.js, and JavaScript.