Continue iOS development

We are a startup, and we work according agile and lean approaches. Let me explain : Every sprint cycle need to have a market validation, called the feedback loop. We already have a fully functionnal APP for iPhone in in testflight beta-test. We want someone that is willing to continue the journey and help us iterate on the product, om the next sprint cycles. Skills are: iOS development, and API integration (Restful) We will pay on a sprint basis.