Markout server is written in C# and uses almost none third-party libraries. It's perfectly optimized for speed and reliability.
 
It doesn't depend on any third-party databases for user-critical data. We haven't heard about even a single case of data loss so far.
 
We paranoidally backup and encrypt all data on our servers.
 
You can also get an installed edition in order to manage and protect your data by yourself.