Round 1: SQL, DSA, LLD • SQL • Be comfortable with JOINs (inner, left, right, full), subqueries, GROUP BY, HAVING, WINDOW functions. • Practice writing queries to solve real problems (e.g., “find the 2nd highest salary,” “top N per group,” “running totals”). • DSA (Data Structures & Algorithms) • Focus on arrays, strings, hashing, recursion, linked lists, stacks/queues. • Classic problems: sliding window, binary search variants, two pointers, cycle detection, subarray sums, sorting-based logic. • Leetcode “Easy/Medium” level is usually enough. • LLD (Low-Level Design) • Expect object-oriented design problems. • Prepare to design systems like Parking Lot, Library Management, Tic-Tac-Toe, Snake & Ladder, BookMyShow. • Key points: class diagrams, responsibilities, relationships, extensibility, and clean OOP principles (SOLID). ⸻ Round 2: DSA + Core Subjects • DSA • More complex problems: trees, graphs, DP, greedy algorithms. • Be ready for 1–2 medium/hard coding problems. • Practice dry-running your code and optimizing. • Core Subjects (depending on your background, usually CS fundamentals): • OS → Process vs thread, deadlocks, scheduling algorithms, memory management. • DBMS → Transactions, ACID, indexing, normalization vs denormalization. • CN → TCP vs UDP, OSI model, HTTP vs HTTPS, IP addressing. • OOPs → Inheritance, polymorphism, abstraction, interfaces vs abstract classes. ⸻ Round 3: HR • Typical behavioral round. They check culture fit, communication, motivation. • Questions to prepare: • “Tell me about yourself.” • “Why this company/role?” • “Biggest achievement/failure?” • “Where do you see yourself in 5 years?” • “Why should we hire you?” • Be genuine, structured (STAR method), and confident.