Lot's of work done in
Certified Data Engineer hive Spark Scala
Java[Strust,Hibernate ,Spring ],Hadoop[Hive,Sqoop MapReduse and Spark]
Android[NFC,RFID,OC,Printer,CreditCard reader ],DataBase[Oracle and MySql ],WebService[SOAP and RESTFul] work done in lot application some of already in google holding Master degree in Computer Science.