System Design Interview Prep:
A Beginner's Roadmap

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Introduction

Most of us are taught to believe that only IITians or students from prestigious institutes like NITs or IIITs get a fair shot at companies like Google. But here’s the truth: your college doesn’t define your destiny — your mindset does. 💯

This is the story of Arjun (name changed), a small-town student from a Tier-3 college with no campus placements, limited exposure, and a slow internet connection — but with big dreams.


🎓 The Beginning: A Tier-3 Reality Check

Arjun entered his college with the same dream many of us have — to get a good job and make his parents proud. But soon, the reality hit.

  • The curriculum was outdated.
  • Professors read from slides.
  • Placement talks were almost non-existent.
  • There were no peers talking about tech giants or competitive programming.

So, how did Arjun end up at Google? Let’s break it down.


STEPS

🔍 Step 1: Self-Awareness & Goal Setting

Arjun didn’t start by solving 100 problems a day. He began with a very basic but powerful step: introspecting.

👉 “Why do I want to join Google?”

👉 “What do I enjoy doing in tech?”

Once he was clear about his goals, he stopped comparing his journey to others and decided to follow a routine tailored to him.


📚 Step 2: Learning the Right Skills

He asked seniors, browsed Reddit forums, followed tech YouTubers, and understood this simple formula.

“DSA + Problem Solving + Projects + Communication = Cracking Big Tech”

Key Resources Arjun Used:

  • Data Structures & Algorithms:
  • Coding Ninjas
  • CodingWithIITIans 🚀
  • LeetCode (150+ questions)
  • GeeksforGeeks (daily practice)
  • System Design & Projects:
  • YouTube + GitHub
  • Built a resume-worthy project using MERN stack
  • Open Source Contributions:
  • Contributed to GitHub repos
  • Joined GSSOC and Hacktoberfest

⏱️ Step 3: Time Management with Pomodoro

No coaching. No peer group. Tons of distractions. But Arjun discovered a game-changer — The Pomodoro Technique. 🍅

25 minutes of focused work followed by 5-minute breaks boosted his concentration and energy.
 (We wrote a full blog on this technique here).


💼 Step 4: Resume & LinkedIn Makeover

Arjun created a minimal, one-page resume with:

✅ DSA skills (with problem counts)
 ✅ Projects (GitHub links)
 ✅ Achievements (online contests, ranks)
 ✅ Keywords tailored to the JD

His LinkedIn was a mirror of this — active, engaging, and honest.

🔗 Check out our guide on creating perfect tech resumes


💬 Step 5: Mock Interviews & Networking

Arjun didn’t wait for luck. He took mock interviews from platforms like:

  • Pramp
  • Interviewing.io
  • Peer-to-peer mocks from Discord groups

He also cold messaged ex-Googlers on LinkedIn. Some didn’t respond. But a few replied with tips and referrals. 🙌

📅 The Interview Process

After 6 months of focused prep, Arjun got an online coding challenge from Google via a referral.

Round 1: Online Assessment

🧠 2 DSA problems (medium-hard)
 ⏰ Time limit: 90 mins
 ✅ Passed

Round 2 & 3: Technical Interviews

🧠 DSA + System design (real-time problem solving)
 🗣️ Communicated every step clearly
 ✅ Passed

Round 4: Hiring Manager Round

🗣️ Soft skills, past experiences, passion for learning
 ✨ Shared stories about how he learned without guidance
 ✅ Final round cleared

🏁 The Offer Letter

Months later, he got a call: “You’ve been selected.”

He cried. His parents cried. His roommates screamed.

A Tier-3 boy just bagged Google. 🎉


🧠 What You Can Learn From Arjun’s Journey

Here’s what you can start doing right now:

  1. Start Small, Think Big: Don’t compare your Day 1 to someone else’s Year 5.
  2. Prioritize Problem Solving: Do it every single day, even if it’s one problem.
  3. Build Real Projects: Show you can apply what you know.
  4. Use GitHub Actively: It’s your public portfolio.
  5. Stay Active on LinkedIn: Post learnings, interact with recruiters, showcase work.
  6. Take Breaks, Avoid Burnout: Use Pomodoro or 52/17 method.
  7. Seek Mentorship: Cold message, join Discords, talk to alumni.
  8. Stay Consistent, Stay Curious 🧠

✨ You’re Not Behind. You’re on Your Path.

If you’re from a Tier-3 college or feeling stuck, remember this:

💬 “Your background doesn’t define your success — your effort and persistence does.”

Start today. Even if it’s just one step.


Key Takeaways

  • College Name ≠ Career Limit

    • Coming from a tier-3 college doesn’t define your career ceiling. Skills, projects, and perseverance matter more than the brand of your institution.

  • Strong Foundations in DSA & CS Fundamentals

    • Mastery of data structures, algorithms, operating systems, databases, and system design is essential for cracking FAANG-level interviews.

  • Leverage Online Resources & Communities

    • Platforms like LeetCode, Codeforces, GitHub, Coursera, and open-source communities help bridge the knowledge gap when college resources are lacking.

  • Projects Showcase > Resume Titles

    • Real, impactful projects (apps, research work, internships, or open-source contributions) often speak louder than a college’s reputation.

  • Networking & Referrals Help

    • Building a LinkedIn presence, reaching out to alumni, and participating in hackathons/competitions can open unexpected doors.


FAQs

 

Q1. Can someone from a tier-3 college really get into Google?
👉 Yes. Google hires based on skills, not just the college name. Many engineers from tier-3 and even non-CS backgrounds have cracked Google interviews through consistent preparation in DSA, system design, and strong projects.

Q2. What should I focus on first – coding, projects, or networking?
👉 Start with strong foundations in coding and problem-solving (DSA), then work on projects to showcase practical skills. Networking and referrals should go hand-in-hand, but only after you have something strong to present.

Q3. Do CGPA and college grades matter for Google?
👉 A decent CGPA (usually above 7.0/10) is enough to clear eligibility criteria. Beyond that, your coding skills, projects, and interview performance matter far more than your marks or college rank.

Q4. How much time does it take to prepare for Google from scratch?
👉 It varies. With consistent effort (2–3 hours daily), it usually takes 12–18 months to build the right coding, system design, and interview prep level, even starting from a tier-3 background.

Q5. Are internships necessary for landing at Google?
👉 Not mandatory, but highly recommended. Internships at startups or open-source contributions add credibility and real-world experience to your resume, making it easier to stand out.

Q6. What if I get rejected once—can I apply again?
👉 Yes. Google allows reapplications after a cool-off period (6–12 months). Use this time to strengthen your weak areas before reapplying.


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