Rok – Android, Kotlin, Jetpack Compose

This cooperation involved the development of two complex Android projects, including a mobile crypto exchange application used by over 500,000 customers!

• Implemented best practices in software development in Kotlin, including Clean Architecture, SOLID principles, and Test-Driven Development (TDD);
• Used Kotlin and RxKotlin for chained network requests with Retrofit;
• Designed WebSockets system in Kotlin for real-time data visualization;
• Implemented MVVM architecture with Google’s architecture components;
• Developed a custom MVI architecture framework in Kotlin;
• Persisted offline data with Room library to improve user experience;
• Mentored and guided junior developers, fostering their growth and development;
• Improved application performance and kept the crash-free rate at 99.9%;
• Developed and maintained automated testing suites to ensure the application's quality and reliability;
• Implemented security best practices to protect sensitive user data and prevent unauthorized access.

A SaaS service for an eCommerce mobile app builder, helping businesses create their mobile apps without any technical skill or background!

• Integrated third-party APIs for payment processing, shipping, and order tracking;
• Implemented Shopify and WooCommerce REST APIs;
• Integrated technologies and libraries such as Dio (networking), BloC (UI architecture), GetIt (dependency injection), JSON serialization, and Hive (persistent storage);
• Built a team of talented developers and marketers, ensuring that the team was aligned with the company's goals and objectives;
• Raised seed funding and secured key partnerships, enabling the company to scale and expand its reach;
• Collaborated with customers to understand their needs and pain points, ensuring that the product was user-friendly and met their requirements;
• Created and executed marketing campaigns to promote the product, resulting in increased brand awareness and customer acquisition;
• Conducted market research and competitive analysis, providing insights that were used to improve the product and stay ahead of the competition;
• Developed and maintained documentation, including business plans, financial models, and investor presentations, ensuring that all stakeholders had access to the necessary information;
• Managed the company's finances and operations, ensuring that the company was profitable.

A mobile personal finance and budgeting tool enabling its users to track and manage their daily expenses and organize their bills and budgets. The app received over 1 million downloads within the first two years of release!

• Designed and developed a personal finance application;
• Implemented direct "Bank connection” with the end user that aggregated users' transactions from over 9000 banks across the USA, Canada, and some cryptocurrency exchanges;
• Led efforts to improve application performance, resulting in a 30% decrease in load times and improved user retention rates;
• Refactored Java code to Kotlin and implemented new features in Kotlin;
• Used RxKotlin and Sockets.io for the networking layer and SQLite library for persisting data across the application;
• Implemented push notifications and other messaging features, increasing user engagement and driving growth;
• Collaborated with the QA team to define and implement testing strategies, resulting in fewer bugs and higher-quality releases;
• Assisted in recruiting and hiring new team members, ensuring the team had the necessary skills and experience to deliver high-quality applications.

The project included developing a water-tracking application. It is designed to help users track their daily water intake and improve their hydration levels.

• Designed and developed the mobile application for a water tracking app;
• Implemented Google Analytics to track user behavior and usage patterns;
• Carried out the backend integration for analysis purposes (Google App Engine + Google Cloud Endpoints).
• Integrated Android Push Notifications with GCM (Google Cloud Messaging) to engage users in their water intake levels.
• Introduced best practices in software development, including Clean Architecture, SOLID principles, and Test-Driven Development (TDD), ensuring that the application was maintainable, scalable, and easy to test;
• Conducted user research and usability testing, providing insights that were used to improve the application's functionality and user experience.
• Stayed up-to-date with the latest trends and technologies in mobile development, incorporating new features and functionality to stay ahead of the competition;
• Worked with the design team to ensure that the application's user interface and user experience met the highest quality standards.