How can I find iPhone developer who will do a good job on an app similar to instagram. I want the project to be scalable. Any recommendations?

I would suggest you consider an iPhone app development company with past experience in developing apps like Instagram. Now a day’s companies also offer hiring services where you can hire a developer full time on a project basis and can carry out the required work from them as and when necessary.

I would like to show you some work carried by a company based in Atlanta, Georgia and you can check out their website as well for a detailed portfolio analysis

1. Hawimi App

Hawimi is a social platform connecting multiple things like Social Interaction, Fundraising, E-Commerce, ticketing, etc in one place. Hawimi helps your thought to flow.

Kindly checkout the detailed portfolio on their website and hope the answer helps.