I applied online. The process took 3 weeks. I interviewed at Optum (Columbia, MD) in Jan 2014
Interview
Pretty normal questions based on programming, oracle and linux/unix. And HR based questions. I applied through the career section of their company web site. I was called for an interview after 2 weeks. First it was phone interview. After that I got a call after 2 days for a personal interview. I was interviewed by two managers and one director.