Sad to say the dev still did not send me any bounty
I also tweeted it (but have not much followers so far )
https://twitter.com/snodohome/status/917402381058498562
Share, if not secret, what kind of knowledge you need to have to be able to program such blockexplorer? What programming language should I know? And do I need to know higher mathematics?
I did not program it on my own, I just made the setup The block explorer I used is Iquidus as you can see at the bottom of the page.
This one is written in node.js I am a software developer and I needed those skills to be able to make the setup and of course to modify the explorer so it shows up the masternode count now.