Java (Spring Framework, Spring Boot, Spring Cloud, Spring WebFlux, Spring Data, Spring Security, Spring Web, MapStruct, Micrometer, EJB, JSP, Hibernate, JDO, JDBC, JPA, JSF, RichFaces, PrimeFaces, SEAM, JOOQ, Apache Camel, Apache Spark), Scala, Kotlin, .NET (.NET, .NET Framework, ASP.NET Core, an open-source web development framework | .NET MVC, ASP.NET Core, an open-source web development framework | .NET Web API, WCF, WPF, WWF), TypeScript/JavaScript & HTML5 (Angular, React, Vue, Nuxt, Ext.js, Backbone.js, jQuery, Bootstrap, DoJo), С/C++ (98/11/14/17/20; STL, Boost, Qt/QML, CMake, embedded)

Databases (IBM DB2, Oracle, Microsoft SQL Server, PostgreSQL, MySQL, MariaDB, AWS DynamoDB, Azure Cosmos DB, Azure SQL, Snowflake, MongoDB, Couchbase, Elasticsearch, Prometheus, Cassandra, ClickHouse, Redis, MinIO)

DevOps (Kubernetes, Ansible, Terraform, Docker, Jenkins, GitLab, GitHub, ArgoCD, Prometheus Stack, Elastic Stack, Zabbix, PostgreSQL, Redis, Azure, AWS)