I'm a longstanding FOSS developer that has mostly focused on contributing to the Linux networking stack and the Netfilter project codebase. I live in Sevilla which is located in south Spain.
Email: <pablo AT netfilter DOT org>
My IRC handle is p4blo.
Questions about using nftables should go to the Netfilter's user mailing list: <netfilter AT vger DOT kernel DOT org>.
You can read the nftables HOWTO to get familiarized with it.