Too Long; Didn't Read
AWS Lambda is a pretty <a href="http://www.engindogusoy.com/aws-lambda-missing-piece-of-aws-orchestration/" target="_blank">big deal</a> both for devops and REST APIs. It is a simple promise; instead of running a machine at all times to compute when needed, start a machine (fast!) when needed and release it after computation is done. Health checks, monitoring, scaling and even security (in some cases) problems are things of the past and you have more resources to focus on your value proposition.