- Integration with third-party applications using REST API client. - Develop REST API using Jersey web server.- Reduce High Load on Java and SQL side. Fix, refactor and test legacy code. - Upgrade test stack. Wiremock (REST API), TestContainers (Docker images), H2- Upgrade log system and integrate with ELK using Logstash and Kibana.- Building new microservices. Migrate existing ones using Spring Boot.- Improved deployment and monitoring process.

Bot development for online game. Bittrex crypto trading API integration with web UI. Spring Boot, Bootstrap, REST API, MySQL, Scheduler, MVC, Thymeleaf, Hibernate, JUnit, Log4j, Git, Maven, linux, AWS EC2 + RDS.

Responsibilities: - Backend and frontend development; - Research blockchain networks to found most profitable strategy- develop and deploy from scratch;Description:Server application with multi-threading. Gathering stats from web sites via JSON. Real-time monitoring blockchain networks states via web-sockets. Processing data and looking for best profitability to switch equipment on proper mining pool. Monitoring and gathering statistics from mining devices via TCP… Show more Responsibilities: - Backend and frontend development; - Research blockchain networks to found most profitable strategy- develop and deploy from scratch;Description:Server application with multi-threading. Gathering stats from web sites via JSON. Real-time monitoring blockchain networks states via web-sockets. Processing data and looking for best profitability to switch equipment on proper mining pool. Monitoring and gathering statistics from mining devices via TCP sockets. Sending commands on TCP sockets. Sending alert messages with Telegram-bot. Gathering statistics from mining pools for each device via JSON. Simple database on SQLite with few tables: config, stats, subtotals. HTML web page with CSS and graphical chart on JS. System working 24/7 with multi-threads and non-blocking IO. Main challenges: thread concurrency, IO blocking, performance, uptime. Show less