How coding interviews work

Coding rounds test problem solving, code quality and communication.

📖 Key ideas

Product companies and many service companies use online assessments, then live coding rounds.
Problems come from arrays, strings, hashing, trees, graphs, DP and more.
Interviewers judge approach, correctness, complexity and clear talking.
Platforms to practise: LeetCode, HackerRank, CodeChef, GeeksforGeeks.
Consistent daily practice beats cramming.

💡 Real-life example: Like a driving test: they watch how you think, check your mirrors, and handle surprises, not just whether you reach the end.

Online assessmentTimed coding test before interviews

ApproachYour plan to solve the problem

ComplexityTime and space cost of a solution

PatternA reusable problem-solving technique