• Developed new features and supported existing code for Pulse Secure Desktop client – a solution providing secure network access (VPN and 802.1x) running on different platforms with tens thousands of customers and millions installations.Worked with large codebase in C++ on Windows (7, 8, 10) and C++/Objective-C on OS X (10.x).

* Designed and Developed Access Policy Engine - cloud based SDN application server on top of OpenDaylight providing RESTful API control network access based on various information collected. Built using Scala (mostly) and Akka framework to achieve high performance and scalability.* Participated in development of HP Network Protector - SDN application to protect network based on analises of DNS requests. Implemented core analysis of DNS requests using HP's RepDV (DNS/IP reputation) database. Designed and implemented realtime statistic collection and analysis using distributed Cassandra database. Provided analysis and recommendations to improve system performance.* Designed and developed Common Senses client - Android application (also ported to Linux) built on top of Secure Personal Sensor to collect data from various physical sensors and send them securely to Common Senses Server using REST and/or XMPP protocols.* Implemented prototypes of SEP2 (Smart Energy Profile) server and client as a proof of concept.* Participated in designing/development of Sensor Personal Sensor Java SDK that provided a uniform way to collect data from various physical activity sensors supporting different public and proprietary protocols. Was responsible for implementing different protocols (including Continua specification) over various media: USB, Bluetooth, ANT+.* Lead development of Common Senses Web portal - social web application to stimulate physical activity. Built using GWT development toolkit and RESTful communication to server.* Worked on building Commons Senses Web Server – RESTful server collecting and aggregating health and wellness data from personal health devices. Worked with Java, Scala, Spring, Hibernate, JAXB.

* Worked on supporting Cisco NAC (Network Access Control) appliance - Windows agent and backend rule database.* Designed and developed native EAP authentication modules for Vista/Windows 7.* Supported Cisco Secure Service Client (Aegis client).

Acquired by Cisco Systems on August 2006.* Participated in creation of "TNC IF-T: Protocol Bindings for Tunneled EAP Methods" specification (https://www.trustedcomputinggroup.org/wp-content/uploads/TNC_IFT_v1_0_r3.pdf).* Designed and lead team to build Aegis server - multiplatform (Windows, Solaris, Linux, FreeBSD) RADIUS server one of the first servers supporting EAP authentication.* Designed and lead team to build flexible and portable EAP authentication framework used in both Aegis client and Aegis server on Windows and Unix.* Developed and supported Aegis authentication SDK and authentication client for secure network access based on 802.1x specification.* Worked on designing and building SIP server.

• Developed Java based web applications using java page compilation, applets and J2EE technologies (JDBC, JavaBeans) with two-, three- and multi-tier architectures.

• Maintained large distributed corporate network with Internet access.• Managed various RDBMS systems (Oracle, PostreSQL, MySQL).

• Developed a document management system.• Installed, supported computer system (OS, network, RDBMS) on client's site and trained personal to use it.