AWS Kinesis Record Transformation

We have three end-to-end project implementations which included extensive automation using Lambda & Cloudformation templates. We have extensive experience in AWS IAM policy/role management. We also have expertise in Python script, Automation via Lambda & AWS Config rule management. Before we accept this, we would like to know why do you need the code to be written in C# instead of Python? Is there any hard dependency? If not we can write the code in Python in 1 day & you can take 2days to review the same.