Rahul Singh.

Global creator-commerce platform driving $5B+ in annual retail sales and serving 40M+ monthly shoppers. Contributed to the Android application supporting both creators and consumers.

• ▸Re-architected unstable short-form video system using Kotlin, Jetpack Compose, Coroutines, and ExoPlayer, reducing crashes to near-zero
• ▸Built "Daily Drops" story-style video feature with custom swipe animations and tap gestures for next/previous navigation
• ▸Reduced app cold-start time by ~80% (8–10s → <1s) by optimizing asynchronous data loading and network coordination
• ▸Analyzed Play Store reviews using Python to identify recurring stability issues, helping sustain 4.0+ rating for 11/12 months
• ▸Led modernization of feature flag system, removing ~70% obsolete flags and improving release reliability
• ▸Designed and implemented swipe-based creator discovery feature, increasing engagement and follow conversion
• ▸Collaborated cross-functionally with Product, UX, Backend, and Analytics teams from architecture through production release

Tool and inventory management platform enabling tracking, theft prevention, and asset management.

• ▸Contributed to Android features for inventory tracking and tool management
• ▸Contributed to scalable architecture for device synchronization and asset monitoring
• ▸Improved performance and multi-device compatibility across Android hardware

Remote patient monitoring application integrating BLE-enabled cardiac devices.

• ▸Developed BLE integration for cardiac device communication and data synchronization
• ▸Implemented MVVM architecture to improve modularity and maintainability
• ▸Enhanced application stability in a regulated healthcare environment
• ▸Collaborated with backend and compliance teams to ensure reliability and data integrity

Contributed to enterprise-grade authentication systems including ZenKey (Project Verify), FirstNet SSO, tGuard SDK, and MobileKey, enabling secure single sign-on across consumer, public safety, and enterprise ecosystems.

• ▸Built secure SSO and identity integration features supporting large-scale telecom platforms
• ▸Implemented device-based authentication logic leveraging SIM, phone number, account tenure, and IP validation
• ▸Contributed to IAM federation flows enabling third-party app authentication via FirstNet Identity & Access Management
• ▸Participated in architecture discussions and design documentation with Product Owners and Architects
• ▸Developed Kotlin and Java features using MVVM architecture
• ▸Implemented automated UI testing using Espresso and unit testing with Mockito to improve release stability
• ▸Collaborated closely with backend and security teams to ensure compliance and data protection

Carrier-specific Android customizations and OEM-level enhancements.

• ▸Developed accessibility features and carrier integrations
• ▸Contributed to system-level customizations aligned with OEM requirements
• ▸Collaborated closely with QA and product teams in Agile delivery cycles

Led Android development for IoT-based physical security and home automation systems, building BLE and MQTT-powered applications from scratch for surveillance panels and custom tablet devices.

• ▸Sole Android engineer responsible for developing BLE-based configuration and diagnostics application from scratch
• ▸Implemented device discovery, scanning, connection lifecycle management, and read/write communication with security panels
• ▸Built system log capture, filtering, and sharing features to support field diagnostics and engineering troubleshooting
• ▸Developed custom tablet-based home automation application communicating via MQTT and ad-hoc Wi-Fi
• ▸Integrated system-level permissions within a locked-down custom ROM environment
• ▸Contributed to security hardening and release readiness, including obfuscation and stability improvements

Customer-facing mobile banking application.

• ▸Developed secure financial features and UI enhancements
• ▸Integrated REST APIs and local persistence layers
• ▸Ensured high reliability and performance in production banking systems

Interactive retail tablet application used in in-store environments.

• ▸Developed high-performance Android tablet application for retail use
• ▸Optimized UI rendering and runtime efficiency across hardware configurations
• ▸Improved responsiveness using Android profiling tools

Progressed through three roles over ~4 years, contributing to enterprise software delivery.