It sounds like you are looking to do mobile app development that works with cloud datastores.
Here are a few blogs that you can take a look at get started with:
http://mobile.awsblog.com/post/TxERCU1UMRFNPB/DynamoDB-on-Mobile-Part-5-Fine-Grained-Access-Control
The above blog post talks about using AWS Mobile SDKs with DynamoDB. In general, mobile.awsblog.com has more resources for developing with other datastores and might be a good resource. For DynamoDB's support for enabling mobile developers to build serverless architectures, please take a look:
http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/FGAC_DDB.html
Hope this helps.
Swami