I've never faced anything of this sort before.
I interviewed at this firm for a position, for which I was rejected, but after the interview the manager requested if he could hold on to my resume for another opening in a different department. He was of the view that my skillset would be better suited for this other position.
A month later, I was asked to interview for this newer position, and my future teammate was also a part of the interviewing team. Yesterday the manager called me to offer me the job, which I was happy to accept.
But today, this 'would be' teammate called me privately to tell me that he was against my hiring, that he though I lacked the experience/skillset, that he could not officially 'boycott' working with me, that he would have preferred it if the position was advertised and they had the option to interview candidates with more experience than me.
What should I do? I haven't signed the contract yet, and apparently the manager seems to be unaware of this employee's resentment towards me.
On the one hand I could go in with a positive attitude and try to work towards addressing any worries this teammate might have. On the other hand I find this behavior symptomatic of a toxic culture at this company.
EDIT: Thanks for your insights. I've been invited to sign the contract tomorrow. I'm not desperate for this job, and I would rule out signing the contract. However, I've decided I'll still go and meet the hiring manager to tell him what happened, and ask him to put himself in my situation - let's see how he reacts and if he's willing to come up with a solution.
I've noted down everything this 'potential' coworker said on the phone, but he was clever enough to call from a 'private number' so I won't be able to definitely prove it was him.
What soured the entire deal for me was the fact that this 'potential' coworker would be my only teammate. Regardless how good I am at my job, I would still need to rely on him to learn the ropes, and I have no intention of dealing with his unprofessionalism. I could probably deal with a coworker who gave me the cold shoulder at first, but the fact that this guy had the nerve to call me even before I was hired shows that this guy is on a warpath (maybe hidden resentments, family issues, passed over for promotion... who knows?). I mean, advertising this position again would cost the firm both time and money, not to mention the backlog of work. Apparently all this extra work has little importance for him compared to his own interests.