I have experience with large data, like Mongo DB, and Oracle RDBMS. In Mongo DB I have relative mastery in ‘Aggregate’ which is related to the Data Process layer, including the Join, and Operator which is equal to Aggregate Function in RDBMS, and Mongo Grid FS is linked to storing large files. In Oracle DB, I have the ability to query JSON documents in which the data are an anomaly and don’t obey a special pattern like symptoms of illnesses in healthcare. Of course, I’m full of experience in Java EE and Spring framework whether typical or Reactive like Spring Webflux and Rsocket, and I also implemented Saga Pattern for distributed transactions linked to microservice environments. Although I have the ability to use Java Language, I have mastery in Javascript like Dom, ECMA Script, and HTML 5, and I also have experience with AngularJS. If you are interested in looking at a sample of my projects, you could follow my GitHub according to the opposite link: https://github.com/kasra-haghpanahFinally, the following topics are parts of skills that I have experienced practical with them.Spring Boot developer Reactive Programming Spring Web MVC by Webflux Spring WebSocket by Webflux Spring Security by Webflux (JWT, Oauth2-client) Spring WebClient by Webflux Spring WebSocketClient by Webflux Spring RsocketServer (tcp, websocket) Spring RsocketClient (rsocketrequester) Spring Rsocket Security(JWT, basic) Spring Swagger Spring Data JPA Spring Data Reactive MongoDB Spring Data Reactive MongoGridFs Spring Cache Spring Slf4j Spring Mail Service Spring Batch Spring Integration Spring Retry Spring Schedule Spring Thymeleaf Spring Test (Mock & Smoke By Junit5) Spring AOP (AspectJ) Spring Validation Spring cloud gateway Spring Eureka Discovery Spring Eureka ClientJava EE developer Dependency Injection (EJB 3.2 , CDI 2) JTA ( Java Transaction API - JSR 907) Batch Processing (JSR 352 - jbatch) in java EE8 Schedule (EJB Timer ) interceptor JPA (Java Persistence API) with EJB JMS (Java Messaging Service) JSR 342 in java EE8 Web Service (jax RS/WS - Restful/WSDL) Create custom HttpServlet with xml and json parser , upload and download , serializer , deserializer Web Socket(JSR 356 - tyrus framework) in java EE8 Test (JUnit 4.1 , Arquillian 1.1.11) JavaMail API(JSR 919) Report Generation spdf by scala (use webkti) Application Server(GlassFish 5, Payara 171.1 ,TomEE 1.7)JavaScript Developer OOP, inheritance, dom, HTML5, rsocketjs, and so on