Write a script in Python or Node.js for use in AWS Lambda

I need a python or node js script I can use in AWS Lambda. I need it to do the following:

A new zip file uploaded to an S3 bucket will trigger this script. The script will then act on that zip file.

The file should be unzipped to a sub folder called 'unzipped'.

In the zip file will be multiple CSV files.

Two of the CSV files need to be manipulated. Rows in the CSV files that match criteria need to be copied to another file.

Please let me know if you need further information.

Please supply an estimate of how long you think it will take, or a fixed price if you prefer.