Notification Service: Multilingual notification service (Email, APNS, FCM, SMS) with a template system and Lokalise integration.Card Storage Service: Secure card storage service compliant with PCI DSS, with regular algorithm updates and data re-encryption.Authentication Server: Development and migration to an authentication server supporting standard and OAuth authorization.User Data Management System: Comprehensive service for centralized storage and management of user data, including order lists and passport details.Other Minor Services: Development and maintenance of various additional services to ensure full functionality and user convenience.Golang, custom DSL, git, gitlab ci/cd,RabbitMQ, MongoDB, Postgress, Elasticsearch, KafkaJWT, OAuth, OpenSSL, encryption, PCI DSS, Secrets Managerdocker, AWS,

Participated in the design and development of an internal and external fault-tolerant resource management system. Worked on the TATLIN.UNIFIED product for a year, maintaining confidentiality in accordance with the Non-Disclosure Agreement (NDA).Golang, pacemaker&corosync, etcd, git, unit test, microservices

Development payments analysis tools for fiscal data operator(ОФД, Оператор фискальных данных).Java, PostgreSQL, Spring Framework, Hibernate, ElasticSearch, JUnit, Maven, git, microservices

Developed applications for testing and training pharmacy personnel using Java Swing and SQL. Additionally worked on various web development projects.Java, Java Swing, SQL

MobiDB – participated in the development of a relational database application for Android. The application supports database creation, data entry forms, CSV data import, and database export to PDF or printing of records.Java, OData, SQlite, git