The term 'Gig' is a registered service mark (held by Fiverr) for uses related to "Operating on-line marketplaces for sellers of goods and/or services" [1]
While this might not be a big consideration right now, this is almost a guaranteed loss in a UDRP/WIPO case against your domain, since you're in a very similar space. It might be a good idea to weigh your options prior to launch, as rebranding will inevitably become more difficult as you acquire users.