If you're working out how to prepare for a system design interview, split your prep into three phases: first, fundamentals like load balancing, caching, database sharding, queues, and CAP trade-offs; second, 10-15 classic designs such as a URL shortener, chat app, and news feed; third, learning how to practice system design interviews out loud under a 35-40 minute timer. Most candidates fail not because they lack knowledge, but because they've never talked through a design under time pressure while someone pokes holes in their trade-offs.

Engineers who know how to approach a system design interview follow the same structure every time: clarify functional and non-functional requirements, estimate scale, agree on the API, sketch the high-level design, and then deep-dive into the data model, caching, and one bottleneck. Spend the first five minutes only on requirements — jumping straight to boxes and arrows is the most common reason candidates run out of time. State your trade-offs out loud at every step, because the interviewer is scoring your reasoning, not just your final diagram.

Frequently asked system design interview questions include designing a URL shortener, a WhatsApp-style chat system, a Twitter or Instagram news feed, a rate limiter, an Uber-style ride-hailing service, a notification system, a web crawler, and a distributed key-value store. SDE-1 candidates usually get lighter problems like a Pastebin or parking lot system, while senior candidates get open-ended prompts like designing YouTube or a payments platform. The evaluation is about your scaling logic and trade-offs, not whether your design matches a "standard" answer.

The System Design Interview by Alex Xu, Volume 1 and Volume 2, is the safest starting point because each chapter walks through a complete design exactly the way an interview expects it. No single system design interview book covers everything, so supplement it with engineering blogs for modern topics like streaming and distributed messaging. Read a chapter, close the book, and redesign the same system from memory on a whiteboard — that active step is where the learning actually sticks.

Grokking the System Design Interview is a widely used prep course that teaches design through reusable patterns, breaking down classic problems like the URL shortener, WhatsApp, and a news feed into standard building blocks you can remix for any prompt. It is genuinely useful for building your first mental template if design rounds feel intimidating. The catch is that its answers are now familiar to interviewers, so treat it as a starting framework and push beyond it with timed mocks where you defend your own trade-offs.

A FAANG interview preparation course is worth paying for only if it includes live mock interviews and personalised feedback — recorded lectures and PDFs rarely change outcomes. Many successful candidates self-study using one solid FAANG interview preparation book for DSA plus free design resources, and then spend the money on mock interviews instead of a course. If you are disciplined and can get honest feedback on your practice, you don't need an expensive program; if you need structure and accountability, pick one with real interviewers, not just video content.

A practical FAANG interview preparation roadmap spans 3-6 months: 6-8 weeks of DSA revision focused on medium-level patterns, 4-6 weeks of system design, and parallel work on your behavioral story bank and resume. FAANG interview preparation for experienced professionals looks different from freshers' prep — interviewers expect depth in design, leadership stories, and measurable past impact, so you should allocate more time to design and behavioral rounds than to grinding hard DSA problems.

FAANG interview preparation in India usually has to happen alongside a full-time job, so plan for 8-10 focused hours a week — short weekday sessions for DSA and longer weekend blocks for design and mocks. Give yourself 5-6 months instead of 2, since you're competing against well-prepared candidates and switching from a service company to a product company typically involves multiple rigorous rounds. Consistency over weekends and evenings beats heroic all-nighters, and schedule your actual interviews only after you've survived several timed mocks.

FAANG interview preparation GitHub repos are excellent checklists — curated question lists, company-tagged problems, and study plans — but reading someone else's solutions creates false confidence. Treat every repo as a question bank rather than a solution bank: attempt each problem yourself before looking at answers. The same applies to the behavioral interview questions GitHub repos compile; behavioral rounds are scored on your own structured stories, which no list can write for you. Use repos for coverage, then close the gap with spoken practice and mocks.

FAANG interview preparation Reddit threads are useful for two things: realistic timelines and difficulty levels from people who interviewed recently, and honest warnings about which rounds to take seriously. The same goes for system design interview Reddit discussions, where candidates share the actual prompts they were asked. The trap is passively scrolling for reassurance — Reddit can tell you what to prepare, but it can't tell you whether you're actually ready. Use it to shortlist topics and questions, then validate yourself in timed mocks with feedback.

The core of how to answer behavioral interview questions with no experience is mining the experience you already have — college projects, internships, hackathons, open-source contributions, club work, or part-time jobs. Build five or six STAR stories around conflict, failure, deadlines, and leadership, and be honest about your exact contribution. The standard advice on how to answer behavioral interview questions still applies fully: keep Situation and Task short, make Action detailed and specific to you, and end with a measurable Result.

The behavioral interview questions and answers that come up most often revolve around a conflict with a teammate, a failure or missed deadline, a disagreement with a manager, a time you took ownership beyond your role, and delivering under a tight deadline. Behavioral interview questions for software engineers also probe cross-functional situations — handling code review disputes, working with product managers, and pushing back on unrealistic timelines. Don't memorise scripted answers; build flexible STAR stories you can adapt to whatever version of the question appears.

Behavioral interview questions at Amazon are mapped to the Leadership Principles, so start by picking 6-8 LPs that fit your profile — Customer Obsession, Ownership, Dive Deep, Deliver Results, and Disagree and Commit are common ones — and prepare two strong stories for each. Amazon interviewers go two levels deep with follow-ups, so every story needs real numbers, your specific role, and what you would do differently. Practising aloud with someone who interrupts and probes, the way a real Amazon interviewer does, matters more here than at most other companies.

Behavioral interview questions for freshers usually stay close to what you've actually done: a challenge in your final-year or course project, how you handled a teammate who wasn't contributing, a time you failed and what you changed, why you want to join the company, and how you learned a new skill quickly. Interviewers aren't expecting workplace stories — they're checking whether you can structure a situation, own your part honestly, and reflect on it, so never bluff experience you don't have.

Situational interview questions are hypothetical, future-facing prompts like "What would you do if the release breaks a day before the deadline?", unlike behavioral questions, which ask about something you've actually done. Answer them with a clear framework: gather information first, state your priorities, walk through your step-by-step approach, and mention who you'd communicate with and when. Interviewers use them to test judgment when they can't rely on your past experience, which is why freshers and career switchers encounter them so often.