Development of high-load Core Java, Spring Boot microservices with Spring Data, Spring Security, Hibernate, Junit, Mockito. DevOps - Kubernetes, Docker, Jenkins. Data - PostgreSQL, Kafka, Redis, Liquibase.Common tasks:Developed REST API Backend microservice for UI, transactional Kafka consumers. Worked extensively on composing, benchmarking, and deeply optimizing complex multi-table SQL queries.Achievements:Independently investigated service reliability issues. Proposed improvements to the service architecture and participated in the development of event-driven inter-service save transaction. Achieved transaction idempotence and eventual-consistency guarantees for the service, eliminating ad-hoc transaction handling mechanisms.Engaged in research, design, and development of a persistent redundant storage based on Redis. Includes work on data structure, data denormalization, consistency, etc. Exploring options with replication, sharding, state recovery through internal replication mechanisms, and dumps from external storage.Proposed a set of improvements to organizational processes and development processes: use of an analog of Miro in initial architectural design - significantly improved understanding of progress in meetings, conducting retrospectives, unit testing queries with embedded SQLite.

Qt, Multiplatform Desktop App, C++14, Apache Thrift, cryptography. Design and development of a cross-platform desktop application. Development of a module for parallel data loading from devices, data analysis, parsing, and processing. Development of multiprocessor interaction algorithms. Development of a user interface. Development of application protocols for secure messaging with cloud services using Apache Thrift. Writing a GitLab CI pipeline.