- Managed development for ‘Loolza’ application for iOS and Android platforms as a team lead - Designed and developed a commercial application for providing consultations to various experts - ‘Loolza’(loolza.ru) from scratch to release on App Store - Maintained synchronization of the 'Loolza'' local base on a phone for ‘Loolza’ application - Developed features for the baby journal ‘Babydayka’(babydayka.com) mobile application - Implemented API tests in Postman for 'Babydayka' application - Designed and implemented message’s chat and audio/video calls in the 'Loolza' application - Integrated ApplePay, Tinkoff, YandexKassa payment systems for 'Babydayka' and 'Loolza' applications - Refactored 'Babydayka' code to optimize screen transitions and fast feed loading

- Refactored ‘Babydayka' backend server code. Optimized SQL requests and DB structure. Reduced the execution time of heavy requests from 3-5 sec to 0.2-0.3 sec - Designed and implemented the REST API for commercial users of service RIAS - data exchange system with the state information system of housing and communal services (GIS ZHKH) - Developed the RIAS web application interface - Maintained and developed data exchange services between RIAS and GIS-ZHKH to the SOAP protocol