I current run
https://apicoin.io, and we have push tx functionality (
https://apicoin.io/api/v1/doc/#pushtx). We are also the currently the only ones that can do it in batch, up to 100 signed transactions in one api call. We use special technology that we designed to do that, so you aren't going to load up any premade software to do that.
Are you dreaming?

Minimum 4 GB per coin and perhaps more. And use load balancing

I would assume we could cope with a DigitalOcean $10/month (1GB RAM, 1 Core, 30GB Disk, 2TB Transfer)
Also this impossible, you would need at least 75GB. But then I wouldn't also use that same VPS for the frontend otherwise you will be running very slow.
Blockchain is
17.3GB. Even with a indexes and everything it shouldn't need more than 30GB, or am I wrong. Not sure what "special technology" you use, but submitting txs to the network is very simple. I'm aware that there is not much " premade software" for blockchain explorers, at least not very good ones, hence the "Need Devs" title. At this rate it seems I'll just have to develop it myself.
What are the qualifications for this job?
And how much would you pay ?
Not sure if I was explicit enough in the OP. I'm looking for some people who want to be part of the project and get a share of profit or donations. (I am broke.)