Need: UI/UX design for a crowd-forecasting web app (one-time project)

We're building a crowd-forecasting website. The functionality will be vaguely similar to metaculus.com (i.e. browse tournaments, submit predictions, view user leaderboard, etc).

We have a web developer on board, but before we hand it to them we want to nail an interface that looks solid and is intuitive for users. Seeking somebody with ** UI/UX experience to work on this as a one time-project (mocking up 10-20 pages in Sketch/XD/Figma/whatever).**

Ideally (but not necessary) would be somebody close-ish to campus, for ease of meeting in person.