Lead Technical Analyst, (April. 2011 to present) SRA International, Columbia, MD Worked on EPIC transformation project for US Office of Personnel Management. The objective of the project is to transform the homegrown legacy Personnel Investigations Processing system to Java Enterprise architecture. This system is used by OPM’s Federal Investigative Service Division in Background Investigation process.Responsible for:• Designed the EPIC core front end module in Portal Architecture using Spring framework, Spring MVC, Hibernate, Event Bus (MQ), Oracle WebCenter.• Re-engineered of the business process from legacy system to distributed J2EE system.• Documented design artifacts in UML.• Managed and guided developers to in design and implementation

Analyzed and enhanced real time lane control software that processes toll transaction, revenue collection, lane device control and monitoring for Florida Turnpike Enterprise using Rational Rose Real Time in LINUX environment.

Served as core member (July 2005 to Jan. 2010) of the instant message host team responsible for designing and developing high quality large scale applications to support millions of AIM/ICQ users using C, C++, MySQL, Sybase in the UNIX environment.o. Designed and implemented AIM BLAST server that provides many-to-many and one-to-many instance messaging services for millions of AIM users.o. Analyzed and developed Location Server to track and determine user location, find nearby buddies and provide popular locations for all opted in AIM/ICQ users. o. Enhanced and maintained AIM legacy system by strengthening its security and providing file sharing, image transfer services for Mobil users.o. Maintained and improved AIM Key System Admin Tool which provides authorized users to manage development, deployment, production keys for many AOL products in PHP and JavaScript.

Managed AOL chat host team, and designed, implemented many AOL chat features, including member empowerment, anti-spam, match chat, chat search and expression, etc.

 Served as Senior Software Engineer (May 1996–May 1999) for the search team providing a variety of search services for AOL provided content, and completed ACCESS Number server for access team to save company millions of dollars by providing updated local numbers around the world o. Designed and implemented index server that make regular content searchable.o. Led a team to build and maintain newsgroup search system.

o. Designed and implemented concurrent, multiservice Application Server in C/TCP/IP/IPC (socket and message queue) on Sun Sparc 20.o. Implemented error handling for Art Service Server and CGI scripts in C/PERL, Art Service Demon uses Information Manager’s API to do query and UniSQL database to manage its image data

o. Led the design and implementation of Client-Server, real-time FAA software (Interim Situation Display) that performs Oceanic Air Traffic Control. ISD is written in C++/C using Xlib, TCP/IP, IPC (socket and pipe) on IBM RISC system/6000(AIX) and Display Control with X-enhancement (DCX) platforms. o. Developed and maintained real-time traffic management application HARS (High Altitude Route System) on HP-UX in C/Motif/TCPIP/IPC/RS232. HARS has client/server architecture, and consists of route optimization aircraft-type specific performance modeling, dynamic weather forecast database, real-time national composite server weather, aircraft historical future projected position based on sampled radar position data, processed flight plan data and Motif GUI.

o. Designed and developed a graphic application which continuously monitors multiple AIX system's usage and resources with Motif/X11 and UDP/IP in C.o. Developed and documented an accounting subsystem and many administrator tools for the R&D group.

o. Researched on real-time testing and debugging in distributed systems

o. Teaching and Researcho. Developed a FORTRAN software package for a large-scale climate model and for statistics analysis of weather forecasting data