Sure! I've been a frontend engineer for about 6 years. I started with jQuery but quickly moved to React around 2018. In my last role at TechCorp, I led the migration of a legacy monolithic app to a Next.js based micro-frontend architecture, which improved our load times by 40%.

The virtual DOM is essentially a lightweight copy of the actual DOM in memory. When state changes, React creates a new virtual DOM tree and compares it with the previous one—a process called 'diffing'. It then calculates the most efficient way to update the real DOM, minimizing expensive reflows and repaints.

It depends on the scope. For local state, I stick to `useState` or `useReducer`. For global server state, I prefer React Query or SWR because they handle caching and synchronization out of the box. For client-side global state, I've used Redux Toolkit and Zustand, but I try to keep global state minimal.

We had a dashboard that was rendering 10,000+ rows of data and freezing the browser. I implemented windowing (virtualization) using `react-window` to only render items in the viewport. I also memoized the row components and moved expensive calculations to a Web Worker. This resulted in a silky smooth 60fps scrolling experience.

I believe accessibility should be part of the development process, not an afterthought. I ensure we use semantic HTML, manage focus properly for keyboard users, and use correct ARIA attributes where needed. I also use tools like Axe and screen readers like VoiceOver to test my applications.

I'm a big proponent of TDD where appropriate. I use Jest and React Testing Library for unit and integration tests, focusing on user behavior rather than implementation details. For end-to-end testing, I've extensively used Cypress and Playwright to cover critical user flows.

I believe in open communication. In a previous project, a designer and I disagreed on a UI implementation. I scheduled a quick sync, we walked through the user flow together, and found a middle ground that satisfied both the design aesthetic and technical constraints.

I see myself growing into a lead role where I can mentor junior developers and drive architectural decisions. I want to continue specializing in frontend performance while also gaining more exposure to backend systems.