Lead development of Sprout-Smart Plant Sensor (Los Angeles, CA / Remote)• Smart plant watering sensor with iOS app integration.• Sensor can operate by itself, without the iOS app or any setup.• iOS client app written in Swift, SwiftUI, and UIKit, using Bluetooth LE to communicate with sensor.• Plant sensor based on Espressif ESP8684 SoC, C/C++ with POCO libraries, SQLite on device.

• Feature development: check-in process of the Star Wars VR experience, Disneyland. Java and Kotlin.• Ad attribution on Android and iOS with Google Tag Manager and deep linking.• Modernized legacy Android code base, bug fixes for intermittent issues and automated testing in Kotlin.

Lead development and project management• PostgreSQL on Amazon RDS with API server using AWS EC2 and ELB• SQL data validation and integrity checks for millions of records collected in PostgreSQL• Android Bluetooth LE gateway to manage IoT sensor network.• Firmware development and hardware PCB design for Nordic Semi nRF51822, Analog Devices ADXL362• Lead team development process to iterate quickly, and deliver simple, fast solutions for business needs.• Fostered team culture by valuing input from technical and non-technical stakeholders

• Pioneered custom text over video before TikTok existed.• Flipagram was eventually acquired by TikTok.• Pioneered native crash reporting for Android to catch 3rd-party and Android runtime crashes.• Chat feature based on WebSockets and push notifications.• 3rd-party login support using OAuth and other SDKs.• Persistence layer using OkHttp and Moshi, with SQLite database including schema migrations.• Gradle build with ProGuard for bytecode optimization and obfuscation.• Release management of Android app with over 11 million active installs.

• Developed ParkMe Android app to find parking with prices and real-time info.• Google Maps for Android with custom annotations, filtering, and sorting results.• Parametric search by price, duration, entry/exit times, vehicle type, etc.• Java, NDK (Native Development Kit) for C++ libraries with SWIG wrapper.Link to current app in Play Store: https://play.google.com/store/apps/details?id=com.parkme.consumer

• Cardiology application development for analyzing CT scans of the heart (angiograms)• Implemented automatic delineation of coronary arteries using Dijkstra's algorithm, min heaps, etc.• C++ and Qt, DICOM processing with ITK and VTK (Insight and Visualization Toolkits for medical imaging)

Enterprise print software development• IBM mainframe printing for Xerox enterprise printers• Feature extensions and bug fixes in large legacy code base, for example TIFF image support• C and C++ with a Java GUI, on Sun Solaris serversNew build system for 10M+ SLOC legacy codebase• GNU make, fully parallelized, reducing CI build times from 4h+ to 30 minutes.• Reliable dependency tracking for all artifacts, enabling incremental builds in about two minutes.• Supporting many kinds of artifacts, like static and shared libraries, Java JARs, Yacc/Bison parsers, etc.