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Core competencies, techniques and patterns

Application and web development both in Python and/or Go.

Languages (certainly incomplete)
Python, Go, HTML5, CSS, JavaScript, PHP, C/C++, Object Pascal, Java, Prolog, Lisp (and some of its dialects), ASM.
RDBMS (MySQL/MariaDB, PostgreSQL, SQLite), NoSQL document storages (MongoDB, Cassandra, Redis, Memcache), Graph databases (OrientDB, Neo4j, Titan)
Frameworks and libraries
Python (Django, Flask), JavaScript (ExtJS, jQuery), CSS (Bootstrap)
MVC, OOP and most other major modern software design patterns

Former business projects

2006 – 2010
Hosting services (PHP, Django, mailman, etc.)
2008 – 2010
Conception, development and operation of one of Germany's first food delivery platforms with online payment

For more references, please see my published (open source) projects on my private web site.

Noteworthy memberships

2009 – today
German Django Foundation (Deutscher Django-Verein e. V.); 2009 – 2013 member of the executive board.