How to integrate your AWS event-based system with external/legacy systems using RESTful APIs
Mark Schwartz is the author of four books, which are primarily about Digital Transformation. I've listed them in order of publication - most recent at the bottom:
He shares his lessons from transforming a part of the US government. He talks how he has used Agile, DevOps and Cloud to transform. He writes from a practitioners point of view, not a theorist. His style is writing is playful and snarky – you’ll love it!
As an Enterprise Strategist at AWS, he also blogs about helping customers transform in the cloud.
You don’t need to read all of his books, or even in the order he wrote him, but it will help. He has some common threads spread across his books that will help understand the topic under discussion. If you working in a legacy org, struggling to over bureaucracy, these are required reading.