Learn English – Need word similar to ‘fixer’ but for a legit professional context

As of late, my primary work duties have involved being the one on my team who knows the right people, knows how to get things done or at least moving, figures out what people and groups want and figures out how to get it to them in the expectation I can call on their assistance in future tasks that need to be done. It requires a strong skill at building and maintaining relationships, keeping track (if only in one's own head) of weight and amount of favors, and a darned hefty bit of technical knowledge (for when no one else is available and one has to do the work independently).

In private conversations I jest that I've become the 'fixer' in the group, but as I look to formalize this state of affairs, I am concerned that the term's negative connotation might be inappropriate as a professional, legitimate employment position title.

Thesaurus.com makes a number of suggestions, but none of them feel right. I wonder if there is another term similar that captures much the same denotation without the negative connotation. I am also open to suggestions that despite it's connotation, 'fixer' may in fact be the best option.

[Added]

arbiter, arbitrator, attorney — imply legal work; my work is in IT.

intermediary, mediator, negotiator — imply the primary role of a position is negotiation, I perceive it more as arranging resources, leveraging social capital, and, as needed, doing the work one's self. Negotiation plays little role as by the time I'm involved, what is needed is what is needed.

middleman / middle person — overlooks that the position does at times require being very hands-on, plus has negative connotations of a non-worker, someone who gets others to do the work.

power broker — also bears significant connotation baggage. I implicitly have no authority or power; what I get done, I get done by my own merit or by wielding purely social influence.