Earlier quoted context omitted.
Yeah, because the people hiring you have no clue what kind of a maintainability hellscape you're leaving for the next person... Also I'm 97% sure I could own your site in under a day, based on how home-baked you just said it is, and I'm garbage at pen testing. Healthcare site, you say? Jesus Christ, I hope they have data breach insurance.
I can assure you "owning" a home-baked software is 10 times harder than anything that is popular. Thats from someone who does that for a living. Modern web-devs move faster than they think, leaving so many doors open. Someone who works on the same system plenty of years had time to patch the doors.
But am I not right to have red flags fly when someone says they built a home-baked web service for managing health care information? Isn't that nuts, from a security perspective?