I'm currently 1 year in my job as a software developer, working as a consultant. A manager from my company (not my manager) offered me a different job, and a 6+% raise, so still inside my company but for a different client (all of this if the interview goes well). Didn't get any call from my manager, so I guess she does not know about this. Maybe I'm being naive (this is my first job after leaving academia), but this feels a bit weird to me, do managers in big companies "steal" each other's employees?
I like my current job and, for the same salary, I would keep it. Next step towards the new job would be a (technical) interview with the client. What's the best way to handle this? Should I go on with the interview and then talk to my manager with a final offer in my hand and try to get a raise for my current job? Or, should I talk to my manager first? With the first option, if the interview doesn't go well, I get nothing; with the second option, I'm being as honest as possible with my boss but I don't have a final offer in my hand.
Maybe I'm looking at it from the wrong perspective and I should consider different divisions of my company as they were different companies at all, from a job change perspective.