I've heard that if your company doesn't have enough money to build a software team from in-house employees, it can be done by IT outsourcing. How effective and safe is this?

That's right. Recently, IT outsourcing has become increasingly popular, and it's not surprising. I won't describe all the advantages of using such services, because you can find them yourself on the Internet. I'll just only say that it really can be insecure in some cases. This is why it's important to work with a highly reputable firm, as I did when I used software development services of this team. If you're interested in this service then I suggest you go to the website of this company and check out the services it offers. Good Luck!