Crowdfunding websites expert

Hello, Our online crowdfunding platform was built last year and we need a developer with experience in crowdfunding websites to: - Fully integrate the website with Facebook and Twitter: once an investor completes his/her transaction, on the exit page, insert FB and Twitter sharing options. - Make suggestions to improve the ergonomics/investment process on the website. After the completion of the tasks above, we might negotiate a maintenance agreement: we need a few hours of maintenance each month to fix bugs and update as needed. Experience in crowdfunding websites development required. Please provide examples of your work.