Four Digits is ISO 9001 certified since 2009. Our company processes are evaluated three times a year. We keep learning, and we keep improving.
Every code change is checked by at least one other developer. This way we ensure not only that the code is good, but also that it solves our customer's problem.
As platforms grow, it's too much work for a human to check that the software still does what it should do after a change. Automated tests make sure a change doesn't break another part of the platform. We have years of experience in writing automated tests and measuring coverage.