HI, Im planing to implement odoo in my company. Im planing to hire a local company to do some custom modules and implement everything for us (that's what they've been doing for 10+ years). 

My question is, how do I make sure my data will be safe? In other words developers wont sell, dump, or steal my data?

Does odoo have different layers? for an example, developers just have access to the code base layer and dummy data not the actual data? Im new to this please guide me on this. I can remove their access once we are up and running but what if they want to do bug fixes etc in a few months time? How do other medium size companies tackle this safety and security issue?

Im paranoid about this because similar cases have happened that I know of (not related to this system) so I want to make sure my data, companies data, customers data is safe as this system is going to be the central location for all the data. 

Also how safe is DigitalOcean databases? Do you think Amazon is safer or they are the same in terms of security and backups?

Thanks heaps.