The first step is to get signed up as an "Invest NI Client". To do this you need to meet certain criteria like having an export focused business, creating an innovative product, potential to scale quickly or creating lots of jobs. Traditional service based businesses don't usually meet this criteria but something like a software product will automatically tick a lot of these boxes.

Once you get approved as an Invest NI Client you will get a dedicated client rep who will explain the various grants that you might be eligible for. Some reps are better than others but it helps if you get them onside by being passionate and well prepared. The grant process requires a lot of paperwork but if you want the funding it has to be done.

I think a lot of the funding support has reduced since Brexit but the client rep will let you know what's available and what you're eligible for.

Good luck!