Re: Might it be the proposed EU citizens registration for the UK?
Makes sense with the timing.
Some minister will want to know what's feasible or affordable so that they don't seem quite so dumb in the negotiations. So they ask a civil servant for some proposals.
The Home Office's answer to everything is a National ID Database, so the civil servant who is given the research task just fills in the most recent estimate for the population of EU citizens in the UK and asks around the usual suspects for quotes/tenders.
Some opportunistic company reckons it is worth a punt maybe hiring a few people so that they can claim to be ahead of the game if things come to fruition. So they post the ad.
The exact requirements in the ad are therefore one company's guess based on one placeholder-proposal from one civil servant from a minister who is only asking because he hasn't thought about it carefully yet.