Jobberbase is opensource...BUT PLEASE read the details of using it to respect the work Filip and others have done.
There are countless developers who can do what you want. It would help if you outlined the details, provided some screenshots, and clarified the functionality. Once someone gets into paid boards, there are account details, invoice details, member logins, cronjobs, job expiration, account verification, etc....to deal with.
I've found it really helps to visual the business logic..."What happens if....?" type statements.
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Tokyoj
"You can't build a reputation on what you're going to do." (Henry Ford)
"Insanity is doing the same thing over and over, expecting different results." (Albert Einstein)