TRINH THI MAI

Android Developer

• Maintained and modernized a large legacy Android codebase, incrementally migrating Java to Kotlin and reducing technical debt.
• Designed and delivered new UI features and product flows while preserving compatibility with the existing architecture.
• Investigated and resolved production issues across purchase flows, downloads, authentication, deep links, navigation, maps, and device-specific behavior.
• Improved application stability through continuous crash monitoring, root-cause analysis, and production troubleshooting.
• Diagnosed analytics and revenue-tracking discrepancies across third-party platforms and implemented state-persistence improvements.
• Worked across Java/Kotlin, Retrofit, OkHttp, Firebase, and Android Jetpack while continuously improving code quality and maintainability.
• Google Play: https://play.google.com/store/apps/details?id=me.voicemap.android

Android Developer

• Independently maintained and evolved a platform of 60+ Android applications, delivering features and production fixes across the portfolio.
• Modernized legacy applications through dependency upgrades, AndroidX migration, and compatibility updates for new Android APIs/SDKs.
• Developed features using Kotlin, Coroutines, MVVM, Retrofit, and Room.
• Maintained application stability through Firebase Crashlytics monitoring, investigation, and issue resolution.
• Ensured ongoing Google Play policy compliance and managed build/release processes using GitLab CI/CD and Google Play Console.
• Collaborated with backend and QA teams in an Agile/Scrum environment to ensure delivery quality and timelines.
• Google Play: https://play.google.com/store/apps/developer?id=CiPPo%E6%A0%AA%E5%BC%8F%E4%BC%9A%E7%A4%BE

Android Developer

• Extended an internal business application based on the CIPPO platform, delivering Kanban-style task management and locker/product management modules.
• Built an in-app group chat experience with message search, seen status, activity timeline, and document/image media handling.
• Integrated Firebase services including Authentication, Firestore/Realtime Database, Cloud Messaging, Crashlytics, Analytics, and Performance Monitoring.
• Developed features using Kotlin, MVVM, Hilt, Coroutines, Navigation Component, Paging 3, Retrofit, and Glide.
• Implemented multi-language support and improved UI/UX across authentication, account, chat, and document workflows.
• Owned ongoing application maintenance, refactoring, crash investigation, stability improvements, and release updates.

Android Developer

• Independently designed and developed a native Android companion app for an IoT smart-glasses device from scratch, owning the lifecycle from architecture to release.
• Built the application using Kotlin, Jetpack Compose, Material 3, MVVM, and Koin.
• Implemented BLE/GATT communication, including scanning, pairing, service/characteristic handling, and a custom data-transfer protocol.
• Implemented Wi-Fi communication for high-bandwidth data exchange and designed connection management covering discovery, reconnect, and error recovery.
• Integrated cloud APIs using Retrofit/OkHttp and Kotlinx Serialization, while handling Bluetooth, Location, and Wi-Fi permission flows across Android versions.
• Owned production build and release configuration including product flavors, signing, ProGuard/R8, testing, and versioned APK generation.

Android Developer

• Adapted the existing CIPPO platform as the foundation for a new booking application, reusing shared infrastructure to accelerate development.
• Designed and implemented booking workflows for restaurant reservations and beauty service appointments.
• Built the data layer, ViewModels, and Android UI for booking, shop listing, management, and in-app chat/matching flows.
• Delivered features end-to-end from API integration through booking creation, confirmation/matching, and UI.
• Managed versioning, GitLab CI/Docker-based CI/CD, production releases, and post-release bug fixes.
• Continuously refined the booking experience and UI/UX based on evolving business requirements.
• Google Play: https://play.google.com/store/apps/details?id=info.cippo.booking

Android Developer

• Led Android development for a locker booking/management application with integrated online payments.
• Built the application using Kotlin, Jetpack Compose, Material 3, Clean Architecture, and Koin.
• Integrated the Fincode payment gateway covering card management, order creation, and payment processing.
• Integrated REST APIs, Firebase realtime services, push notifications, Google Maps/Location, and CameraX + ML Kit barcode/QR scanning.
• Built the project's initial technical foundation under a tight one-month deadline, including build configuration, dependency injection, and networking.
• Owned application stability, performance monitoring, production troubleshooting, and Google Play release quality.
• Google Play: https://play.google.com/store/apps/details?id=info.wakeatte.wakeatte

Android Developer

• Acted as technical owner for an Android social-matching app, establishing the codebase, technical direction, and driving the real-time calling feature end-to-end.
• Bootstrapped the application architecture using MVVM, Hilt, Retrofit, Firebase, and GitLab CI/CD.
• Designed a custom VoIP engine around OpenTok, encapsulating call sessions, state management, signaling, and audio routing.
• Implemented Socket.IO-based real-time signaling covering call invitation, ringing, state synchronization, and reconnect handling.
• Designed the call domain and complete UI flow from incoming/outgoing calls through in-call, termination, and post-call matching.
• Owned production call reliability and technical delivery while reviewing code, tracking progress, and mentoring interns.

Earlier Experience — Android Developer

• Developed and maintained Android applications across social networking, e-commerce, and booking domains.
• Worked with MVP/MVVM architectures across feature development and application maintenance.
• Focused on feature delivery, bug fixing, stability, and long-term maintenance.