Aayush JainFrontend Prep & Interview Notes

Software Developer at Pixis with ~3 years of experience building 0→1 products — from early POCs to full-scale ad creative platforms.

React Internals & Rendering

Hydration, islands architecture, streaming SSR, concurrent rendering, fiber architecture, suspense boundaries, server components.

Structural sharing, immutability, memoization pitfalls, stale closures, optimistic UI, CRDTs, offline conflict resolution.

CSRF, XSS, CSP, Trusted Types, DOM clobbering, prototype pollution, SameSite cookies.

Core Web Vitals (LCP, FID, INP, CLS), memory leak detection, detached DOM nodes, garbage collection.

Checkout SDK architecture, merchant dashboards, micro-frontends, state management trade-offs.

Unit testing philosophy, React Testing Library patterns, accessibility-first selectors, integration tests.