Need your application checked, or perhaps a threat modeling?
I've been in the cybersecurity world for some years, after having been a software engineer for 5 years.
Ex-Information Security Manager in Adidas, currenty working as a Senior Application Security Engineer in a crypto company, my day-to-day tasks are to perform threat modelings on the company projects, providing security consultancy and providing suggestions on how to write secure code / fix vulnerable code.
On the other hand, if you want to learn AppSec, I am also your man.
Let's talk!