Last 15 years I was participating, developing, designing and managing dozens of projects. Most of them were in Python, developed and worked under Linux (various distros). I was working with different databases, from MySQL and SQLite, to CouchDB, RethinkDB, Redis.
Most of projects uses queue managers, like RabbitMQ, NSQ.
Projects cover wide area of IT - from single-page home websites, to SMS billing platforms and SIP telephony management systems.