Joel O.

Mobile Developer

Full-time available

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Bio

Joel O, is a highly accomplished mobile engineer with over four years of experience building and scaling mobile applications, successfully leading teams and delivering solutions used by thousands of users. He is proficient in Flutter, Dart, Swift, Kotlin, Golang, and JavaScript, with strong expertise in Android and iOS development. His technical stack includes tools and frameworks such as Riverpod, BLoC, Providers, SwiftUI, SQLite, Google Firebase, GraphQL, REST, Docker, Git, GitHub, BitBucket, Postman, Visual Studio,…

  • Projects completed1
  • Hourly rate
  • 3-4 years experience
  • Member since Aug 2025
Expertise
FlutterSwiftGraphQLGitGoLang
Video Intro
Assessments

General Video Assessment

Great score on Manage State in Flutter with Nested Components, Difficulty Medium · Great score on Design a Real-Time Financial Data Flutter Application, Difficulty Medium · Great score on Design an Efficient API Integration Strategy for E-Commerce, Difficulty Medium

Projects

Byteman

A terminal based multiplayer pacman game built with Go

Experience

  1. Senior Front-End Engineer - Engineering Analyst

    PT ChatApr 2024 — Feb 2025
    • Developed full-service mobile app enabling family-district engagement
    • Built administrator dashboard for managing schools, assessments, and learning styles
    • Integrated secure authentication and performance monitoring tools
    • Contributed to UI/UX improvements based on real-time user feedback
    Automated TestingClean CodeCode ReviewDartDockerFigmaFlutterGCPGitGitHubGoogle FirebaseGraphQLIAMIntegration TestingInVisionInVision StudioJavaScriptKYCMVCMVVMOAuthPostmanRESTScrumSentrySwiftUnit TestingVisual StudioVisual Studio CodeXcodeGitHub ActionsSwiftUIBitBucketGmailApple iOSSQLite

  2. Senior Mobile Engineer

    Pay4Me IncDec 2021 — Present
    • Led the mobile team in architecting and developing the Pay4Me App (Flutter)
    • Oversaw end-to-end development lifecycle, from planning to App Store/Play Store releases
    • Mentored junior developers and conducted code reviews to maintain high engineering standards
    • Built and maintained CI/CD pipelines (GitHub Actions) for automated testing and release
    • Collaborated with Product, Design, and QA to deliver features that improved user retention by 20%
    flutterdartswiftkotlinxcodefigma

  3. Mobile Development Mentor

    Bells University of TechnologyJan 2018 — Present
    • Designed Flutter learning curriculum for junior developers
    • Mentored 30+ students on cross-platform app development, testing, and deployment
    flutterdart
Education

  1. B.Sc. in Computer Science & Information Technology

    Bells University of TechnologyOgun, Nigeria2018 — 2023
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