The AWS Cloud Development Kit (CDK) is a software development framework for defining your cloud infrastructure in code and provisioning it through AWS CloudFormation. The AWS CDK allows developers to define their infrastructure in familiar programming languages such as TypeScript, Python, C# or Java, taking advantages of the features those languages provide.

When I worked as an AWS Solutions Architect with Digital Native Businesses in the UK. I worked directly with many companies that tend to build their own solutions to the problems they encounter and commonly embrace Infrastructure-as-Code practices.

https://aws.amazon.com/blogs/developer/working-with-the-aws-cloud-development-kit-and-aws-construct-library/