TypeScript

Accessibility basics for forms and components

Explains labels, keyboard behavior, focus, semantic HTML, errors, color contrast, and accessible custom controls.

A Next.js page streams locally but arrives all at once in production. How do you diagnose it?

Traces buffering through the production artifact, proxy chain, compression, cache, platform adapter, and version consistency.

A value is missing even though the TypeScript model appeared to allow the code. How would you model and narrow nullable or optional data correctly?

Separates optional, undefined, null, and invalid external data, then narrows values at the correct boundary.

Avoid duplicated derived state in React

Explains when to derive values during render instead of storing duplicate state that can drift.

Build a cancellable Angular typeahead that cannot show stale results

Builds a debounced typeahead with latest-request semantics, local error recovery, explicit states, and lifecycle-safe subscription ownership.

Build a filtered and paginated list page

Explains URL-backed filters, API query parameters, pagination, sorting, empty states, and shareable list views.

.NET Full Stack

Full-cycle .NET full-stack interview preparation.

A role-based preparation path covering C#, ASP.NET Core APIs, data access, frontend integration, testing, deployment, system design, real-life scenarios, and behavioral interview topics.

Frontend Engineering Foundations

Shared JavaScript, TypeScript, browser, and CSS foundations for modern frontend interviews.

A framework-neutral frontend foundation covering JavaScript semantics, TypeScript contracts, browser rendering, CSS diagnosis, storage, caching, and production deployment failures.

React & Next.js Frontend Foundations

Frontend mechanics for product-focused full-stack engineers.

A focused frontend path covering TypeScript and browser foundations, React components and state, hooks, data fetching, Next.js rendering, accessibility, testing, performance, security, and practical UI implementation.

React & Next.js Practical UI Labs

Build the interaction, handle every state, and prove it through user behavior.

A hands-on frontend interview track covering accessible forms, API error mapping, duplicate-submit protection, uploads, data states, search races, optimistic rollback, URL filters, server-client boundaries, capability-aware UI, hydration, component tests, error recovery, render performance, and Playwright flows.