- Involved in developing and maintaining a crypto-analytic platform (few thousands users, java, spring, postgre, kafka)- Integrated with public and private blockchain nodes for Bitcoin (and some it’s forks), Ethereum, Tron (java, spring, zookeeper);- Developed and maintained highload microservices system (java, spring, kafka, postgre);- Maintained crypto-analytic core services providing TBs of data for client services (java, spring, zookeeper, kafka);- Worked with high performant SQL scripts in combination with python, bash and pg server configuration (sql, python, bash)- Developed and maintained OLAP integrated services (java, spring, clickhouse)

- Involved in developing and maintaining a crypto-investment platform (few thousands users, java, spring, postgre, redis);- Worked on a crypto trading bot (Autopilot) (used spring, http, postgre, kafka);- Maintained integration with Binance (used http, webflux, xchange, plain Binance API);- Worked on authorization system (JWT, Apple Auth, Google Auth);- Maintained mock environment for dev and stage (mockserver);- Involved in Kafka integration into the system processes.

- Involved in developing and maintaining an investment platform (more than 10000 users, 80% Kotlin, 15% Java, 5% Groovy);- Built integration with external services, ex. HitBtc exchange (used spring);- Developed and maintained interactions between owned services (used http, grpc, protobuf, kafka)- Involved in work with a substantial part of the platform (include stocks allocation, monetary calculations, and other financial features);- Had large experience with API testing of microservices in a mocked environment (used junit, spock, powermock, mokito, kotlintest, springtest);- Developed GraphQL parts for owned services;- Developed and maintained services written in reactive manner (used Project Reactor).

- Developed and maintained 5 telegram bots for 11 small businesses in Samara;- Built simple CI/CD pipelines (used Jenkins, GitHub, Docker Hub, Yandex.Cloud, Ubuntu);- Made IoT device (smart scales) for controlling goods (used Arduino Uno, RaspberryPie, RaspberryOS);- Created a cash register web-application for automating accounting (hosted on RaspberryPie);- Developed integration to GoogleSheets API for an accounting purpose.- Led a small team (UX/UI designer, Front-end developer and I)

- Developed and maintained a register integration system, which receive data from different DBs (a few million rows in each), merge/validate etc., and host it as a web service for around 15 thousands services and people; - Solved customer support issues (discuss it and implement/fix);- Developed and supported substantial parts of a school performance system in Moscow (use by a few million users).

Java Software Engineer (Jan 2014 - Aug 2016)- Involved in fixing bugs, refactoring legacy codebase and code review process (used java 1.6-1.7);- Designed and implemented an accounting DB solutions (used Oracle).Lead Software Engineer (Sep 2016 - Jun 2017)- Led team which had 2 junior java developers and a QA engineer;- Involved in forming a roadmap and backlog building process for a maintained modules;- Did post-production analytic work on complicated issues (used AWR logs, Thread Dump, Heap Dump).