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

I am an experienced iOS Developer with a proven track record of delivering high-quality, user-centric mobile applications using Swift and React Native. Skilled in Agile environments, I excel in front-end UI/UX design and have some experience with back-end integration. Recognized for leading feature development, optimizing app performance, and supporting successful client launches. I am committed to creating intuitive digital experiences that drive engagement and business value. I thrive in collaborative, cross-functional teams and continuously refine my technical skills to deliver polished, scalable mobile applications.…I am an experienced iOS Developer with a proven track record of delivering high-quality, user-centric mobile applications using Swift and React Native. Skilled in Agile environments, I excel in front-end UI/UX design and have some experience with back-end integration. Recognized for leading feature development, optimizing app performance, and supporting successful client launches. I am committed to creating intuitive digital experiences that drive engagement and business value. I thrive in collaborative, cross-functional teams and continuously refine my technical skills to deliver polished, scalable mobile applications.

Colin Russell

App Developer, Developer, UX Designer, +2





I am an experienced iOS Developer with a proven track record of delivering high-quality, user-centric mobile applications using Swift and React Native. Skilled in Agile environments, I excel in front-end UI/UX design and have some experience with back-end integration. Recognized for leading feature development, optimizing app performance, and supporting successful client launches. I am committed to creating intuitive digital experiences that drive engagement and business value. I thrive in collaborative, cross-functional teams and continuously refine my technical skills to deliver polished, scalable mobile applications.…I am an experienced iOS Developer with a proven track record of delivering high-quality, user-centric mobile applications using Swift and React Native. Skilled in Agile environments, I excel in front-end UI/UX design and have some experience with back-end integration. Recognized for leading feature development, optimizing app performance, and supporting successful client launches. I am committed to creating intuitive digital experiences that drive engagement and business value. I thrive in collaborative, cross-functional teams and continuously refine my technical skills to deliver polished, scalable mobile applications.

Available to hire

I am an experienced iOS Developer with a proven track record of delivering high-quality, user-centric mobile applications using Swift and React Native. Skilled in Agile environments, I excel in front-end UI/UX design and have some experience with back-end integration. Recognized for leading feature development, optimizing app performance, and supporting successful client launches.

I am committed to creating intuitive digital experiences that drive engagement and business value. I thrive in collaborative, cross-functional teams and continuously refine my technical skills to deliver polished, scalable mobile applications.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Work Experience

iOS Developer at Service Echo, Toronto, ON

July 31, 2025 - September 1, 2025

Designed and developed key features for a B2B field service management app used by technicians and service teams. Implemented dynamic forms, customizable UI components, and offline data syncing using UIKit, Core Data, and Firebase. Followed MVVM architecture with some MVC, contributed to CI/CD setup via CircleCI, and handled App Store releases. Improved app performance, stability, and usability through targeted optimizations and user feedback. Built and maintained a field service iOS app using Swift, UIKit, Core Data, and Firebase. Led development of features such as Work Order Forms, Mobile Cards, and Segments. Reduced crash rates by approximately 10% through performance tuning and offline optimization. Developed Google App Engine middleware to connect the app with Salesforce. Applied MVVM and MVC patterns for scalable, testable code. Managed CI/CD with CircleCI and handled App Store releases. Supported 5+ client go-lives through cross-functional collaboration and delivery.

Mobile Developer at Walletifai, Toronto, ON

December 31, 2020 - September 1, 2025

Contributed to the development and maintenance of Walletifai’s React Native mobile app, delivering new features and resolving user-reported bugs. Collaborated with a cross-functional team in Agile sprints, participating in daily stand-ups and sprint planning to ensure continuous progress. Communicated regularly with senior developers to align on implementation details, receive mentorship, and ensure code quality and consistency.

Mobile Developer at Craft Tapp Inc., Toronto, ON

July 31, 2020 - September 1, 2025

Maintained and updated the Craft Tapp user app and implemented future mobile apps. Coordinated interactions between the user app and the web admin apps. Refined and acquired technical skills on an ongoing basis. Revamped the app in React Native instead of Swift for cross-platform support. Built an iOS app for ordering locally sourced craft beer and beverages. Integrated Stripe for secure payments and GMS MapView for interactive maps. Used Alamofire for networking and UICollectionView for dynamic, scrollable layouts.