Back-end:
Java, Python, Spring (Boot, Core, MVC, Security, Data), Spark, Hadoop, JPA, Hibernate, Apache POI, Apache PDFBox, Jasper Reports, Liquibase, AWS (EC2, S3, RDS), JUnit, TestNG, MySQL, Swagger, Gradle
Front-end:
Angular, JavaScript, HTML5, CSS3, SASS, SVG, Compass, WebRTC, WebSocket, Grunt, Bower