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None of these things you've done will remove access for this person.

Contact me if you need a recommendation. I can point you to good security consultants probably within your budget.

Thanks, will have that in mind, as its' not up to me to allocate funds for consulting, etc.

Any idea how much can such a service cost, assuming web application with a very common stack (such as Ruby on Rails + PostgreSQL)? Is it something like $5k, $10k, or $20k+? Or it really depends? Sorry if it's a very amateur question, I have no experience in dealing with such companies so have no clue how much can it cost.

It really depends, common stack don't mean that much. Depend what app is doing, how much dependencies it has, with what external services it talks, etc. Also 5k, 10k - this would price per day. And then you hire guy/company for day. It depends from app, but it might take some time.

Security is not cheap.

Disclaimer: worked for such company.

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