"I’m assured that many things people believe about MI5’s recruitment processes are myths. It is not true that it doesn’t recruit tall people, for instance. There is a height restriction for those who want to work in its mobile surveillance teams, but that is quite different to the digital stuff. It doesn’t kill anyone either. “The Security Service is subject to the rule of law in the same way as any other public body.”
That said, you do have to be very secretive. I am told: “You must not discuss your application, other than with your partner or close family.” MI5 does not disclose the names of any of its staff – the sole exception being the director general. If you’re interested, you do have to ask yourself seriously if you’re discreet enough. You must be the sort of person who does not need to discuss work with friends and family.
Put bluntly: “If publicly celebrating your career successes is important to you, you should reconsider your suitability.”