Java-based stack for REST backend development. Experience with MVC (active page templates) backend development. Experience with profiling and optimization memory consuming JVM. Knowledge algorithms and best practices for hi-quality development (OOP, SOLID principals, TDD, code-review). Experience with deployment to different containers (jboss, jetti, tomcat, docker). Integration backend applications with external systems and into micro services architecture. Experience with JNI modules development (C/C++). Experience with SQL-based DB storage and optimisation processes. Experience with modern frontend stack development (angular, react). Experience with integration with blockchain based backend technologies and smart-contract development (solidity).