- Software implementation - assembler, C, Delphi, ... - algorithms (++design new ones), right project structure; - Finding and fixing bugs (including performance enhancement), software debugging - case when only compiled version is available; - Reverse/research of almost all possible file types - decompilation, disassembling, translation of executable code into phseudo-language (C), generic analysis of functionality and detailed report; - Decryption and decoding; - Anti-spam, anti-virus, anti-malware related problems, vulnerability assessment; - Mathematics, science-related software, numerical calculations, process modelling; - Data Bases; - Russian language; - Professional work.