Operating Systems / Platforms:
- MS Windows / 95 / 98 / ME / XP / NT / 2000 / 2003
- Unix: Linux, FreeBSD, OpenBSD

Programming Languages / Tools:
- C; C++; C#; MFC;
- JAVA (JDK);
- ObjectiveC
- Visual Basic;
- Pascal;
- Assembler IBM-360; Assembler IBM-PC;
- Fortran IV;
- Matlab; Matcad.

Databases / RDBMS:
- MS SQL Server with Analytical Services, OLAP
- Oracle (PL/SQL, OCI, ProC)
- Sybase
- IBM DB2
- PostgreSQL
- MySql
- Microsoft Access
- Interbase
- dBase, FoxPro
(SQL and additional programming language for every mentioned RDBS)

Web Servers:
- Microsoft IIS (ASP)
- Apache
- Tomcat
- Orion
- JRun

Application Servers:
- JBoss
- MS Exchange Server 2000
- Websphere

Telephony:
- hardware
- Dialogic SDK
- TTS/ASR (Microsoft, L&H)
- Voice UI
- CallXML, VoiceXML

Wireless / Mobile Technologies:
- i-mode (XHTML-MP)
- WAP/WML/WMLScript
- Vodafone PML
- website-integration with Vodafone portal
- J2ME
- Symbian OS

Quality Assurance (testing):
- Norton Ghost
- Quest Partition manager (Multiboot partitioning)
- Rational Robot
- Rational Test Studio, Rational Purify, Rational Quantity
- Testing on different versions of Windows ( 95/98/ME/XP/NT/2000 ), with different SPs, with different versions of browsers IE, NN, other (with/without SPs, security updates), etc.

Web Technologies:
- J2EE (EJB, JSP, Servlets, applets; JDK 1.1, 1.2, …1.5)
- ASP
- .NET
- CGI programming
- PHP, Perl, Python
- XML, XSLT
- HTML, DHTML/JavaScript (for different browsers)/VBScript, XHTML, CSS
- VRML

Development Tools:
Microsoft Visual Studio;
JBuilder;
Borland Delphi;
Borland C++ Builder;
Apple WebObjects (Java and ObjectiveC);
MMbase (Java, JSP);
SpyXML;
Embarcadero Rapid SQL;
Erwin, BPwin;

Network Technologies:
TCP/IP (Winsock/Internet Protocols);
VOIP;
IPX/SPX;

Component Technologies:
COM; ATL;
CORBA;
JavaBeans.

Distributed & Enterprise Technologies:
DCOM;
RMI;
JINI;
J2EE (EJB. JMS).

Object Oriented Design:
- Rational ROSE; UML
- Poseidon; Together

XML-based Technologies:
- XSLT
- SOAP
- DOM/SAX Parsers

Content Management Systems (development in CMS):
- OpenCMS (Java, JSP)
- Zope (Python), Plone
- mamboserver (php)
- propriate version of CMS for OneHello (with many languages)

Versioning control, management:
- CVS
- Tutos
- Microsoft Project
- MS Visual SourceSafe

Graphic design, 3d modeling, videoconferencing:
- Adobe Photoshop, Adobe Illustrator, CorelDraw;
- Maya;
- Macromedia Flash