Experience within Capital Markets and Risk a big plus.
Over 7 Years of Java: Core java, Collections, Multi-threading, Exception Handling and concurrency,
Over 4 years of Messaging: Solace or JMS, Spring: Dependency Injection only, design patterns ,
JVM Performance Tuning JMC, jconsole, jvisualvm, Java Flight Recorder, Yourkit or any other tool, should have understanding of GC and thread statistics.