We just launched our MVP for our startup, its built on react js and Rails 5.
Its using mongo so the developer MUST have nosql database experience to work on it.
We already have an iphone app and need some new api end points added to launch our android app.
also introduce some react UX flows to the app.
Would prefer somebody local and have high expertise in these.
Can demo you the full site and walk you through the tasks via skype screen sharing.
If the task are done timely this can turn into a long term engagement!