Vendor lock-in
Vendor lock-in can be an issue with serverless architectures. You may think that moving from one serverless environment to another one would be easy, but it can be quite involved. In addition to your code being moved, each provider has specific formats and deployment methods. In addition, you may be taking advantage of technologies and tools specific to your vendor.
Some degree of refactoring will be required if you want to switch vendors. Ideally, your software application will not be reliant on a particular cloud provider. One way to mitigate this disadvantage is to use a framework that packages your application in a way that allows for deployment to any cloud provider. The Serverless Framework (https://serverless.com) is ...
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