Mobile Developer

Open to full-time

Bio

Joel O is a Mobile Developer with over four years of experience in building and scaling mobile applications. He is proficient in Flutter, Dart, Swift, and Kotlin, using these technologies to develop robust Android and iOS applications. Joel employs frameworks such as Riverpod, BLoC, and SwiftUI, and integrates tools like Google Firebase, GraphQL, and REST for backend communication. His development process includes automated testing, CI/CD pipelines with GitHub Actions, and secure authentication practices. At Pay4Me Inc, Joel led the mobile team in developing the Pay4Me App, improving user retention by 20% through effective collaboration with cross-functional teams. He also built a full-service mobile app for PT Chat, enhancing family-district engagement with secure authentication and performance monitoring. Joel holds a B.Sc. in Computer Science & Information Technology from Bells University of Technology. He is well-suited for roles that involve leading mobile development projects, mentoring teams, and delivering high-quality applications.

Expertise

FlutterSwiftGraphQLGitGo

Video Intro

Assessments

General Video Assessment

(91/100)

Manage State in Flutter with Nested ComponentsMedium
Design a Real-Time Financial Data Flutter ApplicationMedium
Design an Efficient API Integration Strategy for E-CommerceMedium

Projects

Byteman

A terminal based multiplayer pacman game built with Go

Experience

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
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
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