I'm a senior software engineer with 7 years of experiences with 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 • Firebase, Realm, MySQL, PostgreSQL, SQLite, JSON, XML • VOIP and XMPP • Social networks API: Facebook, Twitter, LinkedIn, Instagram, Google+, Tumblr, Foursquare, Flickr • Retrofit2, Volley, AFNetworking • Fabric, Flurry, TestFlight, Crashlytics, Mixpanel, Google Analytics, Admob, Push Notification, Dropbox SDK • In-App Purchase, Stripe SDK, PayPal