A Lambda function that converts a .gif uploaded to S3 to an .mp4, and uploads it to the same location.
Written entirely with components from Lambduh, a set of promise-based modules useful for any Lambda function.
For an overview of my experience working with AWS Lambda, check out this Quora answer.
For some detail on using static binaries in Lambda functions, check out this Stack Overflow answer.
For a great gulp-lambda workflow, check out this post on Medium by @AdamRNeary