Dev jobs in Ireland are predominantly corporate enterprise software — very few start-ups. This means Java, .Net and front end Javascript roles are most common. I actually landed my first .Net contract after a 10 year career as a C++ developer and learned on the job.
There’s an idea out there that contractors need to be expert or top rung developers, but this is not true. You can learn on the job and usually end up doing so as most companies have unique ways of doing things.