I'm looking to build some Azure functions in the Azure Functions App Platform as a service. I have a developer who will help me. Can I share the apps publishing profile with him without exposing my password or admin rights to my subscription? Can he deploy into my app without having his own Azure subscription? I suspect no, but need to know for sure.
Personally I think Microsoft would really grow their new cloud platforms significantly if they offered free developer licenses allowing those licenses to only run very limited IO and Volume for testing, say No private domains, 2 concurrent users, 5mb of data and 30 hits per day. I know $150/month does not sound like much, but developers in other parts of the world it's a cost they can't seem to maintain.
The best way for you to accomplish what you're asking about is to add the developer as a "Contributor" for a resource group in your Azure subscription. This is done using the Access Control (IAM) blade for the Resource Group in the Azure Portal. Information on role based access in Azure can be found at https://learn.microsoft.com/en-us/azure/active-directory/role-based-access-control-configure
As far as free access is concerned, there are definitely a lot of ways to avoid $150 per month in costs. I have $150/month in Azure credit that comes with my MSDN subscription. I usually choose free-tier resources when experimenting and if I need to use higher tier resources for something that I am trying to learn, I clean it up after I am done. Using this approach, I rarely use more than $10 of my $150 allotment and am working with resources several times a week. I'd recommend having them sign up for the free trial, setting up spending limits on the account, and using free-tier services.