I'm senior software engineer with 7 years of experiences with web & mobile application development. I can learn your codebase quickly, fix bugs, refactor messy code, and add new features as needed, so you can get your desired perfect result in time for sure. My expertise fields: • Native Android, Native iOS, React Native • Java, Kotlin, Swift, Objective-C, React.js • Google Map, OpenStreetMap, CartoDB • In-App Purchase, Stripe SDK, PayPal • unity, AR/VR • openCV, tensorflow, machine learning & deep learning • web front-end development with javascript: jquery, react.js, angular • back-end development with python, php: django, flask, laravel