Implementing transaction processing mechanisms using modern cryptographic methods. Ensuring the security of user data and transactions using modern encryption and protection methods.Optimizing network protocols to ensure stable operation of the cryptocurrency exchange under high load.Assisting in task estimation and project planning.

Development of a payment system-Development of the application from scratch-Selecting the best technology for the project-Interaction with front-end developers-Integration test coverage

Development of a group of applications for PJSC VimpelCom:SMSPolls (SMS Client Interaction System) - automatic system of SMS interaction with clients (including bot) for Beeline operator: - Spearheaded the implementation of new features and conducted extensive refactoring to optimize performance. - Ensured robust test coverage (unit, modular and integration) for critical application functionalities. - Implementation of new functionality and refactoring,Stack: Java 17, Kotlin, Gradle, Spring Boot, Oracle DB, Junit 5, Mockito, Cucumber, Kubernetes, Docker.SFL Diameter & Speech Analytics (improvement of the operator's internal CRM system for full platform monitoring control) - Developed and maintained SFL Diameter implementation and roaming applications, and enhanced Speech Analytics for comprehensive monitoring of the operator's internal CRM system. - Led the seamless migration of all open functionalities to the 4G network. - Implementation of new functionality and refactoring, - Ensured robust test coverage (unit, modular, integration);Stack: Java 11, Kotlin, Maven, Spring Boot, Oracle DB, Docker, Kubernetes, Junit, MockitoBeeline and TELE2 Antifraud System (control and suppression of possible fraud by customers and operators) - Designed and developed an antifraud system to monitor and mitigate fraudulent activities by customers and operators. - Championed the implementation of new microservices and the refactoring of existing ones to enhance system efficiency. - Directed the development of intuitive UI/UX frontend using Elm, ensuring a user-friendly experience. - Ensured robust test coverage (unit, modular, integration), - Implementation of new functionality and refactoring;Stack: Java 6, 8 (service dependent), Kotlin(new functionality), Maven, Spring Boot, Oracle DB, Docker, Kubernetes, Junit, Mockito, Cucumber, Elm(frontend)

"Speech Analytics" (a CRM system integrated with synchronous speech recognition and conversation analysis. It processes and analyzes conversations in real-time, providing text information and analytical data to improve customer service and enable prompt business decision-making); - Developed the core functionality of the application using Kotlin and conducted comprehensive testing, which included both modular and integration testing; - Frontend implemented on Elm;

- Technical software sales support;- Sales management, customer data collection, product(software) presentation and delivery;