Gigpro does not recommend Pros apply to Gigs that former employers they worked for have posted. Businesses usually do not select former employees for their Gigs, and if they do and you (the Pro) show up, their could be confusion as to why you (the Pro) are there, especially with former co-workers or managers.
Gigpro is about the freedom to choose when and where you want to work, and strives to create harmony in the workplace for all.