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Worked on services that must comply with GDPR:- A “user-termination” service has been created-- Blocking in AppStore and GooglePlay has been avoided.-- Prepared for pre-IPO inspections-- Ready to comply with the requirements of personal data laws in different countries.- Created some features in "file-service"-- Integrated the service with Vault to use the transit secrets mechanism-- Implemented block encryption and file decryptionCreated a core services "user-service" from scratch to prod. This was part of an effort to reduce the use of the monolith:- All decisions were agreed upon through the architectural committee- Opened access for the transition from monolith to microservices architecture- Migrated all data to a separate DB- Monitoring and alerting have been configured- Event-sourcing has been set up for a some of operationsParticipated in discussions of the architecture, technical decisions and weekly technical interview.

- Optimized existing processes, for example, relieving the load on our team’s toggle-service from 2k+ rps to 10 rps- Designed and launched a backend service for one of the versions of the "Alibox" game- Launched and debugged the data synchronization process for the other team- Participated in interview processes and acted as a mentor for new employees- Worked on the admin panel both from the frontend and backend-- added new sections-- integrated admin panel with keycloak

Engaged in the creation of a tool for merchants- Launched and debugged the process of placing merchant goods on the storefront- Creating and debugging a service that parses source files. - Integration with existing systems (further processing, ML tools)Designed and launched a backend service for onboarding merchants- The service consisted of a web version and a telegram bot and required integration with more than ten existing services- Decomposition and further delegation of tasks were carried out during the work

- Designed an extensible console client for GRPC services, enhancing calendar-service development and debugging efficiency- Engaged in the design and implementation of new features (RFC analysis -> sequence diagrams -> review -> code)- Engaged in integration with other services- Fixed bugs and redesigned legacy parts of the codebase

- Reduced the response time from the service by up to 200 times- Reduced the use of processor resources by two times- Reduced the memory resources by one and a half times- Reduced the number of service instances from 120 to 40- Reduced the number of DB instances from 120 to 10- Previously, resources had no reserve for load growth, after which there was a reserve for a five to tenfold increase in load up to 40k rps

- Set up metrics (Prometheus + Grafana), which made it possible to identify really bottlenecks- Moved the service to Kubernetes

Worked on marketing services applying product pricing rules. Achievements:- optimized code base and improved code readability- implemented business-valuable features- became the maintainer of the core marketing service- was promoted to higher position