Worked on the logistics platform. - Integration with logistics providers (CAINIAO, Shiptor, Pochta Rossii). - Transferred all services from Chinese infrastructure to Mail infrastructure. - Wrote Dockerfile and Docker Compose, added assembly to Gitlab pipeline for each service. - Changed HSF calls (Chinese transport) to Rest and gRPC. - Migrated database from Chinese DMS to Postgres. - Packed all external calls (from Chinese services) into a separate proxy service. - Made a separate gateway that proxies requests further along the services. - Forwarding errors from all services to the gateway, with output on the front. - Collection of logs from services in Loki. - Traces forwarding in Jaeger. - Connecting Swagger to endpoints. - Setting up serialization and deserialization of complex models through MapStruct. - Made a service for collecting metrics in Prometheus and set up reporting in all services. - Set up the display of metrics and logs in Grafana, set up alerts.

- Monolith support (legacy in C#). - Splitting a monolith into microservices (Java). - Writing new microservices from scratch (Java), containerization in Docker. - Grafana / Prometheus performance monitoring. - Writing tests (Junit, Mockito). - Database design. SQL (MySQL, Postgres), NoSQL (Redis), ELK stack. - Creation of pipelines in Jenkins. - Working with Atlassian (Jira, BitBucket, writing documentation in Confluence).

- Integration of payment services (Stripe, CoinBase). - Integration of installment systems (Extend). - Designing microservices from scratch. - Writing migrations (Flyaway). - Code coverage by tests (Junit/Mockito). - Adding and rewriting services. - Error handling.