Transitioning from Middleware System Engineer to UX Engineer

I currently want to transition from middleware System Engineer to UX Engineer . I have done some front-end development in past . Will brush up the basics and probably learn some framework. I wanted to know what are the things I should learn and master if I want to become a UX Engineer (design + some development) . A roadmap would be really beneficial in keeping track of things . If there is anyone here who transitioned to UX from development side , what is the roadmap you followed? Would love to know insights from grapevine design community ! Thank You