A product based company builds and sells its own products, such as Flipkart, Swiggy, Zomato, Paytm, Razorpay, Google, Microsoft or Adobe, while a service based company like TCS, Infosys, Wipro or Accenture delivers IT services to client organisations. Product companies generally offer higher compensation, stronger engineering culture and ownership of features, but their hiring bar is stricter, with dedicated rounds for DSA, core frontend fundamentals and machine coding.

Build strong JavaScript and React fundamentals, practise DSA regularly, create two or three solid projects, and prepare a resume that highlights measurable impact. Then apply through employee referrals, LinkedIn, Naukri and company career pages — referrals from current employees significantly improve shortlisting chances in India, so start networking with frontend engineers at your target companies.

Follow a structured 3–4 month plan: solve DSA problems consistently (arrays, strings, hashmaps, trees, graphs), revise core JavaScript concepts like closures, the event loop, promises and `this`, deep-dive into React internals and hooks, practise machine coding by building small apps like autocomplete or infinite scroll, and add frontend system design if you have 3+ years of experience. Weekday evenings for concepts and weekends for mock interviews works well for most working developers.

Strong options include Indian product companies such as Flipkart, Swiggy, Zomato, Paytm, Razorpay, CRED, Meesho and Dream11, along with global product companies with large India offices like Google, Microsoft, Amazon, Adobe, Atlassian, Uber and Salesforce. Compare them on tech stack, frontend maturity, compensation structure and growth path rather than brand name alone, and read their engineering blogs to understand their frontend culture.

Most front end developer interview questions cover semantic HTML and accessibility, CSS layout with flexbox and grid, JavaScript closures, hoisting, the event loop, promises and async-await, debouncing and throttling, browser rendering and network fundamentals, REST API integration, plus framework-specific questions on component lifecycle and state management. Many companies also include a live machine coding or take-home assignment.

Frontend interview questions for freshers usually focus on fundamentals: the CSS box model, flexbox, var-let-const, data types, == vs ===, arrow functions, array methods, promises, basic React concepts like components, props, state, useState and useEffect, and easy to medium DSA problems. Interviewers also expect freshers to walk through their projects and explain the technology choices behind them.

For experienced candidates, frontend interview questions go deeper into performance optimisation (code splitting, lazy loading, memoisation), state management at scale, SSR vs CSR, web security issues like XSS and CSRF, testing strategies, build tools and CI/CD, and frontend architecture decisions. Expect tougher DSA rounds, frontend system design discussions, and behavioural questions about leading features or mentoring juniors.

The most frequently asked React interview questions and answers revolve around the virtual DOM and reconciliation, useState and useEffect, controlled vs uncontrolled components, keys in lists, props vs state, lifting state up, useMemo and useCallback, the Context API, Redux, higher-order components and error boundaries. Prepare each concept with a short explanation and a small code example, because most interviewers ask you to write or debug code on the spot.

React interview questions for experienced developers shift towards internals and architecture: the Fiber reconciler, performance profiling with React DevTools, memoisation strategies, code splitting, server-side rendering with Next.js, state management architecture using Redux Toolkit or React Query, testing with Jest and React Testing Library, design systems, and trade-off discussions where you justify your architectural decisions.

React hooks interview questions typically cover useState and batching, useEffect cleanup and dependency arrays, useContext, useRef, useMemo vs useCallback, useReducer for complex state, the rules of hooks, stale closure problems, and writing custom hooks such as useDebounce or useFetch. Interviewers often give you a buggy component and ask you to fix hook-related issues in it.

They overlap on React fundamentals such as components, state, props and hooks, but React Native interview questions additionally test mobile-specific concepts: Core Components vs HTML elements, React Navigation, platform-specific code, FlatList performance optimisation, and bridging with native modules. React JS interviews, on the other hand, focus on web concerns like the DOM, browser rendering and SEO.

Use a simple present-past-future structure: start with your current role and tech stack, briefly cover relevant past experience and one or two achievements with numbers, and end with why you want this specific role. Keep it to 60–90 seconds, tailor it to the job description, and practise it aloud so it sounds confident rather than memorised.

Pick a genuine, non-critical weakness, show that you are aware of it, and explain the concrete steps you are taking to improve, ideally with progress you have already made. Avoid clichés like "I am a perfectionist" and red flags like "I miss deadlines", and never say you have no weaknesses — interviewers use this question to judge self-awareness and honesty.

In India, developers switching from service based to product based companies typically see hikes of 30–70%, and strong frontend candidates with good DSA and machine coding skills — or multiple competing offers — can sometimes double their CTC. Product companies offer fixed pay, performance bonus, joining bonus and stock components, so always negotiate on total compensation, and anchor the discussion on your expected CTC rather than your current one.

Keep it to one or two pages in reverse-chronological order, lead each experience bullet with measurable impact such as "reduced page load time by 40%" or "migrated 12 components to TypeScript", list your tech stack clearly, add links to two or three strong projects or a portfolio, and use a clean ATS-friendly format without tables or heavy graphics. Tailor the skills and projects section to each job description, because recruiters spend only a few seconds on the first scan.