COMPUTER EXPERIENCEOperating systems (programming and maintenance):

UNIX family (BSD (FreeBSD, OpenBSD, NetBSD, DragonfluBSD),
Linux (CentOS, Ubuntu, Debian, Kali, Kodachi), SunOS, SCO, ConvexOS), VAX/VMS, MS Windows 95-10, MacOS, MS-DOS, ColibriOS, QNX

Programming languages:

PHP, JavaScript (client, server & microcontrollers), TypeScript, Python, Java, C/C++, D, Processing, Perl, SQL, DHTML, CSS, VBScript, Visual Basic, Pascal, Focal, TASM/NASM/MASM

Technologies, libraries & data formats:

Node.js/npm, jQuery, React, Vue.js, Leaflet, WebSockets, AJAX, JSON, SOAP, XML, Sphinx, Jest, JSP, JavaBeans, CGI, SSI, ASP, various REST APIs, including bot APIs, social networks & search systems.

Databases:

MySQL/MariaDB, PostgreSQL, SQlite, MongoDB, Redis, Oracle, MS SQL Server.

Microcontrollers & microcomputers:

Arduino (TinyDuino, Espruino, AttoDuino, SquareWear, SuperDuino),
Raspberry Pi, Black Swift, VoCoore, WEIO.

Networking:

WAN/LAN (Extranet/Internet/Intranet) deployment and administration, informational security (OS and database security tuning, cryptography, firewalls, network security)

E-commerce:

Solid experience in e-commerce area, took active role in development of custom cross-platform engine for e-commerce solution.

Miscellaneous software:

Apache, Nginx, MS IIS, MS Office, MS Project, Rational Rose, Visio, Corel PhotoPaint, Corel DRAW, Adobe PhotoShop, Adobe Illustrator, CraftWave.