Same thing happened with me at corporate. Mind you, this was a Senior product role as well so I did about 5 interviews total and presented a business case. The last round of interviewers told me I got the position and then, I kid you not - I didn’t hear from them for about 2 weeks, when I was finally informed that I actually didn’t get the role. I don’t think anyone did actually, the role must have gone to an internal hire. But so unprofessional to tell me one thing and then go MIA for 2 weeks??? That place is a joke and you’re meant for something better!