Andrew Juers

Andrew Juers

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Lead Android Developer at T-Mobile
Atlanta, Georgia, United States

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  • Tmobile
    Lead Android Developer
    Tmobile
    Jan 2024 - Current (2 years 9 months)
    • Led the architectural modernization and feature development of the flagship T-Life (formerly T-Mobile Tuesdays) consumer rewards and device-tracking application.
    • Directed the migration to Jetpack Compose and graphQL, integrated deep cybersecurity tools (Scam Shield), and implemented real-time IoT hardware tracking via BLE and location frameworks to serve millions of active telecom subscribers.
    • Architected a modular, multi-module Android application structure (feature modules) to support independent team releases and optimize Gradle build times.
    • Implemented Clean Architecture with MVVM, Kotlin Coroutines, and Kotlin Flows for reactive, asynchronous data handling.
    • Integrated Apollo GraphQL client for efficient, r
  • Goldman Sachs
    Senior iOS / Cross-Platform Mobile Developer
    Goldman Sachs
    Nov 2021 - Current (4 years 11 months)
    Architected and developed a high-frequency reactive trading and wealth management application using React Native (TypeScript) and native Swift/SwiftUI for iOS.
    Implemented a highly modular architecture backed by the MVVM-C pattern and Combine to manage complex multi-step transaction and account setup funnels cleanly.
    Drove the progressive migration of legacy iOS layouts to modern declarative UI paradigms, replacing UIKit view controllers with high-performance SwiftUI views.
    Implemented a strict Unidirectional Data Flow (UDF) state management pattern to handle high-volume streaming market data with low latency.
    Optimized iOS bridge performance by writing low-level Custom Native Modules in Swift to execute
  • Spirit Airlines
    Senior Android Developer
    Spirit Airlines
    Sep 2019 - Oct 2021 (2 years 2 months)
    Senior Android developer for consumer travel app delivering booking,check-in, and boarding features in Kotlin.
    Migrated legacy Java modules to Kotlin and improved app stability and maintainability.
    Designed shared UI component library with consistent Spirit branding (buttons, input fields, cards, loading states) across the app
    Integrated analytics SDK for tracking user flows (booking, check-in, boarding pass access) while maintaining data privacy compliance.
    Integrated Free Spirit loyalty program allowing users to join, track tier status, view point balances, and see points required for next tier
    Implemented offline-first architecture using Room database for caching trip data, boarding passes, and flight status
  • Chevrolet
    Android Developer
    Chevrolet
    Dec 2017 - Aug 2019 (1 year 9 months)
    Android developer contributing to an automotive infotainment companion app and connected-vehicle features.
    Built secure vehicle telemetry communication using REST/GraphQL and MQTT for low-latency event updates.
    Integrated vehicle locator functionality to help users find their parked vehicle through the mobile app.
    Worked on connected-vehicle workflows that bridged mobile, cloud, and in-vehicle systems
    Implemented vehicle remote-control features (lock/unlock, climate) with strong authentication and authorization.
    Designed a multi-module app architecture to support product variants across models and regions.
    Integrated Bluetooth LE and BLE scanning for proximity-based features and pairing flows.
    Develop
  • JCPENNEY
    Android Developer
    JCPENNEY
    Apr 2016 - Nov 2017 (1 year 8 months)
    Implemented product catalog screens with efficient paging (RecyclerView and Pagination) and view recycling.
    Built robust cart management and checkout flows with secure payment integration and tokenization.
    Implemented offline caching of product data using SQLite for quick browsing under poor connectivity.
    Implemented dynamic promotions and coupon engine with remote config and A/B testing.
    Integrated with third-party SDKs (analytics, payments, ads) while enforcing privacy best practices.
    Implemented fast image loading and caching strategies (Glide) to improve list scrolling and first paint times.
    Implemented personalized recommendations and search enhancements integrating with backend recommendation engine.
  • Regeneron
    Android Developer
    Regeneron
    Jan 2015 - Mar 2016 (1 year 3 months)
    Android developer contributing to a life-sciences mobile app for research/field operations using Java.
    Implemented secure data collection forms, offline sync, and encrypted storage to protect PHI.
    Built background sync with SyncAdapte for reliable data transmission to backend services.
    Implemented role-based authentication and fine-grained access controls for sensitive lab data.
    Implemented data validation and local persistence using SQLite and ContentProviders.
    Implemented RESTful API integration with Retrofit and OkHttp plus retry/backoff strategies for flaky networks.
    Implemented custom UI components for complex data entry, charts, and form flows.
    Ensured HIPAA-aware logging and PII masking in teleme