HCM system: management of onboarding, training planning, personnel assessment, individual development plans, etc. Low-code platform with front part on Vue.js.Developed and maintained the backend of the system as part of a team of 12 members using the Scrum methodology.- Moved background jobs from Apache NiFi to a new Java microservice, which improved the localization of code and business logic- Optimized queries to the PostgreSQL database, reducing the response time of some application pages from several seconds to ~200ms- Designed and developed the REST API backend for the role management subsystem- Added checkstyle and linter to CI, which reduced the average occurrence of a task in the REVIEW status by 15%Java, Gradle, Spring Boot, Hibernate, PostgreSQL, Apache NiFi, Kafka, Dremio

Worked on an ERP system implementation project in a team of 4 people on the customer’s side: clarified and set technical specifications for the contractor, tested and accepted the developed parts of the system, developed integrations and data transfer scripts.- Automated the migration of regulatory and reference information and initial balances from the old system to the new one- Developed an automated workstation for working with mail, integrated with the Russian Post API, which saved the company up to 80 man-hours per month- Wrote idempotent processing of requests for document generation and their further saving in S3- Designed and implemented endpoints from scratch to manage templates on the fly, saving 8 SP per sprint- To implement the exactly-once guarantee, I used the transactional outbox patternStack: Java, Spring Boot, PosgreSQL, Swagger, Kafka, S3

- Built an EDI (electronic data interchange) module for ERP system- Developed and maintained various information systems based on 1C platform- Developed and maintained integrations with external systems and data interchange