Hiring a freelancer?

Question

Software testing

Good day, I plan to order the development of a web service for working with my clients (ordering, receiving my services) on freelance, I ask for advice on what tools to use when accepting the work done for a sign of efficiency with a large (500-1000 ... per day) number of users , as well as the prevention of malicious codes (there was an experience when they developed a service for me and I entered the data of my clients, after spam hit their contact details).
Thank you in advance for your help!

Answer 1

This issue is discussed before ordering with the performer. Usually the contractor can offer a number of tests in addition to your Wishlist.