SUMMARY

• Android Mobile App Developer with 7+ years’ experience and 4 Android mobile apps published on the Play Store.
• Skilled programming in Kotlin and Java.
• Used reactive frameworks such as RxJava, RxAndroid, RxBluetooth, and RxKotlin.
• Professional experience includes Android apps using Kotlin and Java supported by RESTful services.
• Apply architecturs MVC, MVP, and MCCM,.
• Hands - on with OOP design/patterns: Singleton, Observer, Abstract Factory, Dependency Injection, Visitor, Proxy, Decorator, Integrator, Command, Builder.
• Native Android application development using Java, Material Design, Eclipse, Android Studio.
• Skilled in Firebase real-time database, MongoDB, Realm DB, and SQLite.
• Use of Firebase, Google and Fabric suites for functionality and testing in Android mobile.
• Familiarity with Agile Scrum methods of iterative development on Android teams.
• Work with ad hoc Android development teams to design and develop apps using API/SDK and business embedded logic to achieve mobile app’s desired functionality.
• Experience with Android JetPack components such as Room, LiveView and LiveData.
• Highly proficient in system analysis, design, development, and Android debugging and testing.
• Able to adopt new Android technologies quickly (i.e., recent third-party Android libraries devices).
• Wrote detailed technical documentation per each stage of the Android development cycle.
• Experience with Mockito, Junit, Espresso and simulated design patterns to test and develop applications
• Hands-on experience with debugging and profiling Android applications
• Well versed in Material Design guidelines
• Ability to problem-solve and manage multiple priorities in fast-paced, deadline driven environments
• Hands-on experience with continuous integration tools like Jenkins and Travis CI

TECHNICAL SKILLS

Development Environments/Frameworks: Android Studio, Eclipse

Architecture and Design Patterns: MVC, MVP, MVVM REST

Android Libraires: RXJava, RXKotlin, Retrofit, Android Core Libraries, Volley, Espresso, Glide, Picasso, Fresco, SQLCrypt, SQLCipher, Spongy Castle, Butter Knife, Dagger, Crashlytics, EventBus, Urban Airship, Parse, GSON, Universal Image Loader

Programming Languages: Kotlin, Java

Databases: SQLite, MySQL, Core Data, SQL Server

Google APIs: Google Maps, Google Places, Google Cloud Messaging, Google Charts

Mobile Devices: Phones, Tablets, Smart Watches

Java Frameworks: Hibernate, Struts, Spring, JSF.

Web Services: IIS, Glassfish, Apache, Tomcat, JBoss, RESTful.

Business Intelligence: Jasper Reports, Crystal Reports

Team Management Tools: Jira, Git/GitHub, BitBucket, Team Foundation Server, Jenkins, Travis, Hudson, Project.

Documentation Tools: Confluence, Project

PROFESSIONAL EXPERIENCE

Android Senior Mobile Engineer

Confidential, Austin, Texas

Responsibilities:

• Worked on an Agile team that applied program increment starts with PI planning lasting 2-3 days to go go over new features to implement new policies to follow.
• Participated in/contributed to Android Stand-up meetings to assess current tasks and the status of each.
• Worked with Android Studio as the main IDE for the project.
• Transitioned app from MVP to MVVM architecture and implemented Singleton design pattern in specific reuse instance.
• Used Kotlin as the main code language for the Android application.
• Implemented newer features in Kotlin as well as migrated some existing Java code to Kotlin.
• Used reactive frameworks such as RxJava, RxAndroid, RxBluetooth, and RxKotlin.
• Led backlog grooming sessions and backlog prioritization.
• Utilized JIRA for collaboration.
• Used Azure Git repositories for code management.
• Integrated multiple third-party libraries (e.g., Glide, Retrofit, RxJava and Dagger 2).
• Helped implement SAF (Storage Access Framework) into code for attaching images to transactions and messages.
• Refactored Android Support libraries to be compliant with the latest versions of Android and JetPack such as Android.Preference to Androidx.Preference.
• Wrote instrumentation tests and UI tests using Espresso.
• Ensured code quality writing Unit Tests using JUnit, Mockito, Espresso, and PowerMock frameworks.
• Performed manual regression testing every 2 sprints.
• Completed multiple research stories to ensure compliance with latest version of Android.
• Used Bluetooth low energy and Leak Canary to solve mobile networking performance issues.
• Helped worked on some UI changes as well, mainly text color and font.

Android Developer

Confidential, San Mateo, California

Responsibilities:

• Worked with designers, API developers, and QA in an Agile/Scrum environment
• Worked on existing large Java and Kotlin codebase and createe presenters to handle UI updates, flow of data, and abstract away the business logic from the controller in MVP architecture.
• Refactored several packages from Java to Kotlin.
• Enforced password complexity and saved cryptographically credential-specific, salt protected, and stored using PBKDF2
• Refactored login component to implement an OTP generation algorithm with Google authenticator and biometric authentication with BiometricPrompt API.
• Made Retrofit Rest calls with AES-256 encrypted and secure by HTTPS TLS 1.2 to Amazon Web Services.
• Implemented RxJava for most of our asynchronous processes to simplify threading.
• Integrates custom SDK and API calls to automatically send receipts to online cloud-based accounting software account.
• Included Google Calendar API to read calendar events, read contacts, add or modify calendar events, and send email to guests.
• Migrated Dagger to Koin dependency injection with Android KTX support to new set of features.
• Worked with the Android SDK and implemented Android Bluetooth and Location Connectivity components.
• Cached data from the network and stored in OrmLite local database to display in graphical format using MPAndroidChart library.
• Make efficient checkout mechanism while shopping and include Google Play In-app Billing to sell items and opt in for paid subscription plan
• Included PDFViewer Android library for displaying PDF documents with animations, gestures, and zoom effects.
• Created Mockito and Espresso unit test cases to test Presenters, method interactions, and mock model in MVP architecture.
• Used Zeplin for visual communication between the UI team and the Android development team.

Mobile App Developer

Confidential, San Fransisco, California

Responsibilities:

• Worked in MVP architectural pattern with a basis in RxJava which facilitated back-end processes along with Retrofit.
• Worked on Uncle Bob clean-code architecture using MVP in a TDD environment.
• Programmed code in Java and Kotlin.
• Developed new features in Kotlin to reduce codebase with data classes and extension functions.
• Programmed flights search algorithms and implemented functional RxJava to filter flights by duration, number of layovers, takeoff/landing time, and more.
• Followed documentation to integrate UrbanAirship SDK push notifications to send alerts when fare prices dropped.
• Pair programmed to include features to Book hotels and improve payment mechanism using Stripe API.
• Added ItemAnimator to RecyclerView items and other view animations.
• Configured SSL on the OkHTTP clients to set up ertificate headers in a custom interceptor.
• Incorporated Crittercism library and Google Analytics to send real-time, actionable crash reports and collect user engagement data to backend.
• Resolved camera, location, and external storage dangerous level persmiison to target Android M version and above.
• Optimised image loading with Picasso, removed bitmaps legacy code and replaced ListView with RecyclerViews in entire app.
• Wrote test cases with Junit for unit testing and Espresso for automated testing to ensure quality control.

Android Developer

Confidential

Responsibilities:

• Worked on the Android app development in Android Studio with Java Coding.
• Applied a MVP architeture.
• Applie design patterns Singleton, Decorator, Façade, and Proxy.
• Performed regular Android team code reviews to ensure overall code quality and adherence to company coding standards and industry best practices.
• Researched, evaluated, and tested the app integration with several third-party libraries for multiple purposes.
• Evaluated device and user behavior with Crashlytics.
• Analyzed existing multi-threading issues and rectified them.
• Revamped the user interface with the introduction of material design color, shapes, and animations.
• Re-structured ListViews to RecyclerViews with lazy loading for improved usability and lower memory footprint.
• Lobbied external networking libraries such as Retrofit and Volley to consume REST web services efficiently.
• Used Mixpanel and Flurry to generated customized events in the Analytics retrieval.
• Standardized Picasso Image Loader API as the default image loader across the application.
• Implemented AutoValue for the Parcelable objects generation.
• Detected memory leaks using the LeakCanary library.
• Created a module based on an Event-driven library (Event Bus) to communicate multiple components in the app efficiently.
• Generated custom behavior in multiple screens included in the CoordinatorLayout to hide the Toolbar and the Floating Action Button on the user scroll.
• Integrated a seamless synchronization queue with default Android APIs (Loaders, SyncAdapters, JobSchedulers, GcmNetworkManager, Content Providers, EventBus)..
• Enhanced the usage of SQLite databases backed up by a Content Provider for caching and storing frequently used information