Kelvin Portuphy

Experience

• 2022 - 2025 2y : 11m

  Senior Front-end Developer (Mobile) @ Marygold & Co.

  US - Remote

  Summary:

  • Experienced in developing high-complexity, scalable, data-driven mobile (ios & android) apps with a focus on performance, user experience, and system integration.

  Responsibilities:

  • Built and maintained React Native applications, ensuring scalability, high performance, and clean, maintainable code.
  • Collaborated with cross-functional teams, including designers and backend developers, to deliver seamless and high-quality mobile experiences.
  • Optimized app performance and code quality, ensuring smooth user interactions and alignment with business goals.
  • Developed and integrated complex features, handling data-intensive processes while maintaining a fluid and responsive UI.
  • Designed and implemented reusable, highly interactive components, enhancing application efficiency and user engagement.
  • Created and optimized complex animations using Reanimated, Gesture Handler and React native Skia, delivering smooth and visually engaging user experiences

  Achievements:

  • Enhanced React Native app performance by identifying and resolving critical issues, reducing load times, and optimizing user interactions for a seamless experience.
  • Developed an internal tool to streamline documentation for client-owned code, integrating interactive design guidelines and testable React Native components.
  • Engineered highly complex React Native applications for both US and UK markets, efficiently handling vast amounts of data and implementing intricate business logic.
  • Integrated multiple third-party services to extend app functionality, ensuring seamless interaction with APIs, authentication systems, and business-critical tools.
  • Designed and built reusable, scalable React Native components for a multinational client, maintaining code consistency and improving maintainability across platforms.
  • Delivered high-performance, cross-platform mobile applications optimized for various smartphones, ensuring smooth operation across iOS and Android devices.
  • Created engaging and complex animations using Reanimated and Gesture Handler, enhancing user experience with fluid transitions and interactive elements.

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  • React-Native
  • React
  • JavaScript ECMA6+
  • TypeScript
  • Swift
  • Jest
  • Java
  • NodeJS
  • Postman
  • Git
  • GitHub
  • Figma
• 2020 - 2022 1y : 7m

  Front-end Developer @ Stanbic Bank Ghana

  GH - Hybrid

  Responsibilities:

  • Build and manage Angular applications, ensuring scalability, high performance, and clean, maintainable code.
  • Understand and implement business logic and complex features, handling data-intensive processes while maintaining a fluid and responsive UI.

  Achievements:

  • Built and managed 20+ Angular applications, all developed using TypeScript, ensuring scalability, high performance, and clean, maintainable code.
  • Implemented a design system that run throughout the organization, ensuring consistency and accessibility across projects.

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  • Angular
  • JavaScript ECMA6+
  • TypeScript
  • NodeJS
  • Postman
  • Git
  • GitHub
  • Figma
• 2019 - 2020 1y : 2m

  Intern @ Bsystems Limited

  GH - Onsite

  Summary:

  • I gained a lot of hands-on experience working with co-workers, clients and new technologies like Angular and React Native

  Responsibilities:

  • Optimized development workflows to enhance efficiency for senior developers.

  Achievements:

  • Facilitated cross-platform code execution using CodenameOne (https://www.codenameone.com/).

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  • Angular
  • JavaScript ECMA6+
  • TypeScript
  • NodeJS
  • Postman
  • Git
  • GitHub
  • Figma
  • React-Native
  • React
  • Java