Knowledge of radius or diameter protocol and AAA functionality.
Must have strong knowledge of object oriented concepts & Core Java , JavaEE , Collection Framework etc.
Sound understanding of various design patterns , data structure , multithreading , JVM Internal etc.
Must have knowledge of Spring 3.0 , Hibernate , SOAP , REST API.
Must have knowledge of HTML5 , JQuery , AJAX & JSON. Basic knowledge about these should be fine.
Must have knowledge of PostgresSQL , MySQL , Oracle DB At least Any one.
Must have an idea on servers like Apache Tomcat etc , version control system like SVN etc and build tool like ant , maven etc.
Knowledge / Working experience with Linux OS is an advantage.
Knowledge & experience on Troubleshooting / Diagnosing / Analysis of issues / problems and finding RCA.,