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.