Not sure if you'd call this an insecurity but regardless; frontend.

Much of the stuff I develop is meant to be user/privacy friendly.
Like, at the moment I'm developing an end-to-end encrypted notes web application. The backend is a fucking breeze, the frontend is hell for me. I'm managing mostly but for example, I need to implement a specific thing/feature right now and while the backend would take me about 15-30 minutes, I've been only just thinking about how I'm going to do this frontend wise for the past few fucking hours.

My JavaScript skills are quite alright, html is manageable, css only the basics.

And before people tell me to just learn it; I. Fucking. Hate. Frontend. Development. My motivation for this is below zero.

But, most of the shit I write depends on frontend regardless!