Como dizer "entrar pela porta dos fundos" em Inglês

Hello,

"entrar pela porta dos fundos(through the back door)", não literalmente, mas no sentido figurado, significa a secret or underhand means of access (to a position, place or job for example) usually obtained through some influence.

You can read more about that in the following link: http://www.thefreedictionary.com/through+the+back+door

Best Regards!