The author of the article is exploring the possibility of using Rust instead of Python for AWS Lambdain order to achieve cost savings and better performance. They provide a real-life use case of converting fixed-width compressed flat files to tab-delimited files using an AWS Lambda triggered by an S3 bucket.
The author implements the solution in Python, which they find to be simple and easy to reason about, but it runs slowly and uses a lot of memory. They then write the same solution in Rust, which they find to be faster and use less memory. However, the Rust code is more verbose and has more lines of code, although this may be due to the author's relative inexperience with Rust.
