UNIX platforms provide native environment for web and other network applicationsMany industry-standard solutions (e. g. Oracle products) are grown in UNIX / Linux, so it may be just a natural bed for new system UNIX is an ability to use a variety of Open Source products that save time and reduce costs.
Linux, FreeBSD, Oracle Solaris
Virtualization technologies (both OS and hardware level)
Heterogeneous distributed systems
Fault tolerant solutions
Enterprise products (Oracle) customization / maintenance / integration
C / C++ / Java / Perl / PHP / Python / Ruby / shell scripting
X11/Xorg based GUI applications
Legacy web technologies (LAMP, strong expertise in Apache internals))
Secure communications (SSL/TSL), cryptography
Profiling and optimization
Kernel development
Embedded solutions)
Java development for UNIX