Using a disk-based Redis clone to reduce AWS S3 bill
You should really just foot the bill for AWS. This is going to be technical debt for you later on that will need to be paid. As a software/systems engineer I'll walk away from anywhere doing stuff like this to save a few dollars. I've worked a lot of janky places and now I work somewhere that goes the extra mile and puts that little bit extra in to do things right the first time.  I know the on-going costs of doing stuff like this as well as the fact that you will have to clean it up at some point.EDIT: Not necessarily YOU will have to clean it up at some point, but the next guy most likely will.