Vladislav Gus

This project is an innovative mobile app that provides comprehensive security for users. The client is one of the world's biggest telecommunications providers.

Tech-Stack:

• Kotlin, Android 10.0+, Jetpack Compose, Clean Architecture, Multi Module, RxJava, Coroutines, Dagger 2, FCM, Branch.io.

Responsibilities:

• Develop new application version from scratch as Lead developer;
• Implementing and managing in-app VPN and other Network features;
• Refactoring onboarding and provisioning flows;

Results:

• Increased play-market app rating twice;
• Rethought and rewrote whole Onboarding and customers Provisioning logic;
• Resolved existing VPN-tunnel drops issues;
• Increased app unit tests coverage to 86%.

This project is designed to help athletes monitor their glucose levels in real time using a smartphone. It works in conjunction with a continuous glucose monitoring device.

Tech-Stack:

• Kotlin, Android 8.0+, MVVM, Hilt, LiveData and Coroutines, Retrofit, WorkManager, BLE, Room, FCM.

Responsibilities:

• Designing and implementing the overall architecture of the app;
• UI/UX Development, implementing various custom graphs using Canvas;
• Managing the synchronization of glucose data between the sensor and the mobile app;

Results:

• The app was successfully launched on the Google Play Store and contributed to professional athletes;
• Efficiently handled the real-time glucose monitoring without draining the battery excessively, even when during long training sessions;
• The app architecture was designed to support scalability and ensuring long-term maintainability as the app grew in functionality and user base.

This project provides a convenient and secure way for users to exchange their currency at the best available rates with small, fair, and transparent fees.

Tech-Stack:

• Kotlin, Android 6.0+, RxJava, MVVM, Room, Retrofit, Dagger 2, FCM, Branch.io.

Responsibilities:

• Design, develop, and implement business-logic and UI of mobile application;
• Create API requests to integrate applications with external systems;
• Perform unit testing to ensure applications meet requirements and expectations;

Results:

• Introduced and implemented multiple brand-new transfer variants;
• Rewritten and optimized Network Requests logic;
• Redesigned whole app User Interface;

Project is an open platform with different applications for the commodity business of energy suppliers in Germany. The goal was to bundle a wide range of applications around the core topics of energy and mobility and to address all target groups.

Tech-Stack:

• Kotlin, Android 5.0+, Android Architecture Components library, MVVM, Hilt, Retrofit, Room, Glide.

Responsibilities:

• Designing and developing new Widgets according to user requirements;
• Troubleshooting and resolving any issues with existing Widgets;
• Documenting the process of implementation and testing for future reference;

Results:

• The app was successfully launched and contributed to the end users;
• Implemented 20+ new Widgets;
• Optimized existing Widgets for better performance.

An application for tablet devices (iPad and Android) that acts as a document management system and a CRM for dental clinics. The app makes it convenient for the receptionists to keep track of their patients and helps to make sure that all the vital information is present and up to date.

Tech-Stack:

• React Native v.0.58+, Redux, Realm.

Responsibilities:

• The implementation of the business logic and UI from scratch;
• The implementation of API requests;
• Release application to the Play Market and App Store;

Results:

• Application development from scratch to the market launch;
• More than 10 dental clinics started using this application;
• All the features are working correctly on both Android and iOS.

This project is a mobile application with a single code base and a flexible design that allows for a unique design for each gym. It provides users with the ability to access the gym schedule, select a training type and trainer, and pay for the services directly in the app.

Tech-Stack:

• Java, Android 4.4+, Android Architecture Components library, MVVM, Retrofit, Room, Glide.

Responsibilities:

• The implementation of the Business logic and UI from scratch;
• Working closely with stakeholders to define requirements for applications;
• Release application into the Play Market and App Store;

Results:

• Application development from scratch to the market launch;
• More than 100 gyms across the US use this application with its unique design and functionality.

This project is designed to offer an innovative solution for businesses to distribute marketing campaigns and discounts to potential customers easily.

Tech-Stack:

• Java, Android 4.4+, Android SDK, OkHttp, Socket, Greenrobot eventbus, Realm, Glide, Facebook SDK;

Responsibilities:

• Developing business logic and user interface for the application;
• Implementing custom Google Maps functionality and map items;
• Refactoring and improving app socket connection;
• Optimizing application performance to ensure optimal user experience.