[ndriscoll]

At my last job, we had an architecture that ran hundreds of thousands of individual jobs with internal API calls for nightly account updates and reporting work, and it was a major battle to finally get it replaced with some simple SQL scripts which ran orders of magnitude faster while being a lot more reliable.

As I understand it, banking commonly uses JVM where you can easily do async or multithreaded processing and task scheduling, so lambda doesn't offer much over ECS, and the timeout could be a real killer.