Proven expertise in system development and maintenance within Oracle PL/SQL environments, along with comprehensive knowledge of web technologies such as PHP, Laravel, YII Framework 1.1 and 2.0, Redis, ElasticSearch, Memcached, RabbitMQ, Docker, HTML5, CSS3, JavaScript, jQuery, Bootstrap, MySQL, and WordPress. Proficiencies include mobile development for Android using Java/Kotlin, complemented by substantial experience with mainframe systems, specifically Cobol, CICS, and DB2.