If you’re preparing for your first technical interview, don’t spend all your time solving harder and harder DSA problems.

For most fresher interviews, you need to be ready for four things: DSA, CS fundamentals, your projects, and explaining your thinking clearly.

1. Get interview-level DSA solid

You don’t need 500 random LeetCode problems.

Be comfortable with the basics of:

• Arrays, strings and hashing
• Two pointers and sliding window
• Binary search
• Stacks and queues
• Linked lists
• Trees, BFS and DFS
• Heaps
• Basic graphs and DP

More importantly, practise going from brute force → optimisation → code → complexity out loud.

Getting the right answer silently is different from interviewing well.

2. Revise CS fundamentals selectively

For fresher SDE interviews, I’d prioritise:

OOP: inheritance, polymorphism, abstraction, interfaces
DBMS: joins, normalisation, indexing, transactions
OS: processes vs threads, deadlocks, scheduling, memory
CN: HTTP/HTTPS, TCP vs UDP, DNS, basic networking

Don’t memorise textbook paragraphs. Be able to explain each concept in your own words and answer one or two follow-up questions.

3. Know your projects ridiculously well

Anything on your resume is fair game. For every major project, prepare:

• What problem does it solve?
• Why did you choose this stack?
• How does the architecture work?
• What was the hardest technical issue?
• What would you improve with more time?

If you used an API, database, framework or library, understand what it actually does. “I followed a tutorial” becomes obvious pretty quickly.

4. Practise speaking, not just studying

Take a question and explain your approach before writing code.

If stuck, communicate what you’re considering instead of going completely silent. Interviewers can evaluate a partially correct thought process; they can’t evaluate thoughts you never say.

TL;DR

For fresher technical interviews:

DSA + CS fundamentals + deep project knowledge + communication.

Spend less time collecting resources and more time practising the actual interview loop: understand → explain → solve → analyse → handle follow-ups.

That gap between “I know this” and “I can explain this under pressure” is where a lot of otherwise prepared freshers get stuck.