Comment by zeroCalories

Over the years it's become clear to me that frontend is probably the hardest part of the stack. People think they can just shit out some bootstrap react app and it's perfect, but being able to write complex UIs that can work on any browser, any device, with all assistive technologies, and all languages, is extremely hard. You need someone with a deep knowledge of html, css, and the supportive web apis. A good frontend engineer is incredibly rare, even at big tech. What's even more rare is a UX designer that also thinks about these things, who are worth a million bucks.