• Designing and developing GoatChat - Your AI Chatbot Android mobile app (500K+ downloads)• Designed and developed Adapty - Ai Assistant Keyboard Android mobile app• Designed and developed ADAPT - online store builder/dashboard Android mobile app (10K+ downloads)

• Designed and developed an Android app "ForteTravel" for online tour booking in Kazakhstan (1000+ installs)• Designed and developed an Android marketing SDK "Adaptive.Plus" (zerek.ai). Integrated the SDK into the Android apps of 2 client companies• Re-implemented Main, Accounts and Transfers modules of the internet banking Android app "Homebank" (1M+ installs) according to a new app design• Designed and developed an Android payment SDK for JSC "Halyk Bank", integrated Samsung Pay SDK• Designed and developed a constructor that dynamically builds payment services for the Android app "Homebank" (3000+ services)• Designed and developed an Android app “Sond” for online hotel booking in Kazakhstan (100+ installs)

• Designed and developed a car sharing Android app “Anytime Prime” for Moscow with over 50,000 installs• Designed and developed an Android app “Anytime Concierge” for the proprietary maintenance issue tracking of a car sharing company (tasks such as repair, car washing, vehicle inspection, etc.) (100+ users)

Taught a Python-based industrial programming course developed by Yandex to group of 15 high school students

• Developed a cross-platform mobile car navigation app “Yandex.Navigator” written in C++ (50M+ installs)• Simplified the integration of partner advertising in the app by rewriting the internal C++ application library• Implemented the automatic customization of the Android app status bar, solving the problems caused by various custom Android firmware and drawing of native and cross-platform UI elements, which led to a reduction in the size inconsistency between Android and iOS user interfaces

Taught Android development to 40 startup founders who later published their apps on the Play Market

• Designed and developed a custom Android chat application to improve company’s customer support• Implemented user accounts handling, image and video files sharing functionality using Firebase services

Built “TrafficRules.kz”, an Android app for driving license test preparation during summer mobile developers incubation program: ~ 600 downloads on Play Market

Coached students for programming competitions resulting in Gold and Silver Medals in the National Olympiads