Lee is Javascript and front end SME, not just the big 3(Angular, Vue, React) but also semantic HTML, CSS, SEO, Accessibility, node apis, hybrid apps, etc.
Lee has been working in this field since 2003, the IE 4 and 5 days. Thank golly those are over. No matter what flashy framework you pick its all HTML, CSS, and JS underneath. Lee's consulting agency name is BERZERK.IO and usually has a mix fulltime work and consulting.