FortiGate Intrusion Prevention System (IPS)2012-present* Analyzed network attacks, detection losses and false positives to implement new detection features that allowed signature team to write efficient and performant attack detection rules.* Analyzed, implemented, and extended parsing and dissecting of network protocols to extract data and detect crafted packets.* Implemented FlowAV scanning mode: full antivirus scanning of network traffic passing through FortiGate… Show more FortiGate Intrusion Prevention System (IPS)2012-present* Analyzed network attacks, detection losses and false positives to implement new detection features that allowed signature team to write efficient and performant attack detection rules.* Analyzed, implemented, and extended parsing and dissecting of network protocols to extract data and detect crafted packets.* Implemented FlowAV scanning mode: full antivirus scanning of network traffic passing through FortiGate devices.* Performed extensive refactoring, profiling and optimization for several platforms (x86, x86-64, ARM, MIPS).Antivirus engine for FortiGate appliances and desktop FortiClient application2010-2012* Designed and implemented compiler of safe C subset along with cross-platform dynamic linker/loader for x86, x86-64 and ARM; desktop and embedded Linux, Windows, and OS X environments. This toolchain allows analysis team to write highly customizable performant code to analyze and detect malicious application behaviour.* Developed rootkit detection module to find and remove rootkits that had already crept in the system before antivirus installation. Reverse engineered Windows kernel structures to find and neutralize rogue hooks, overriding system access permissions. Removal module rebuilds critical OS data in the runtime to ensure integrity of the system.* Disassembled and analyzed virus samples to develop new detection techniques.* Improved and extended custom DSL for AV signature matching.* Profiled and optimized signature matching algorithms.* Developed module to detect code injection into a running processes. Show less

* Developed distributed web crawler Msnbot 2.0 to visit web sites and download billions of documents per day for Bing search engine.* Designed the system to be reliable and failsafe, to work with minimal devops intervention; to automatically detect and retry failed jobs while trying to obey web-site's robots.txt rules.* Developed tools to simplify debugging, profiling, and log aggregation across hundreds of machines in the environment.

* Developed and integrated Direct3D graphics backend for fast chart manipulation in vessel navigation and port management software.* Improved and extended cartography visualization engine: developed new widgets, implemented data serialization, etc.* Developed tools to fetch and convert weather data, and draw it over naval chart collection.