[selfhoster1312]

Here in France pay for IT jobs in public services is more around 20-40k€/year, while consultants brought from the private sector cost somewhere between 500-3000€/day.

Let's be very pessimistic about it (in real life it's much less), and say the public servant is gonna cost you 80k€/year. That's still at the VERY least ~50% cheaper than the 150k€/year consultant.

It's mathematically impossible for a consultancy putting money into shareholders to be more economically-efficient than a public administration. There's not a single historical example of that. Privatization of railway, energy and hospitals here in Europe was supposed to bring better service and reduce costs: it has done exactly the opposite.