Hi there,
I am an expert in Node.js with more than two years of experience. I can develop and deploy the Lambda function you need with Node.js. The function will routinely get the names of your S3 bucket files and produce a CSV output file. The output file can either be sent with the response (if function triggered by HTTP) or can be saved in another S3 bucket. To get started, add me to the AWS project and provide me Lambda Admin Role so I can start developing and deploying the Lambda as required. Let me know what you think of my offer. Thanks for your time and consideration.