Round 1: Online Test - Format: Multiple-choice questions (30) and DSA problems (3) - Platform: DoSelect - Duration: 2 hours Round 2: Aptitude Test - Format: Multiple-choice questions (30) - Mode: Pen & Paper - Duration: 30 mins - Topics: Work & Time, Ratio & Proportion, Age, Probability, Percentages, Profit & Loss, Interest, Clocks, Pipes & Cisterns, Trains, Speed & Distance etc. Round 3: In Person Technical (1-to-1) [45 mins] Q. Tell me about yourself Q. Working & Implementation of Blockchain Technology (Note: “Blockchain” mentioned on resume) Q. SQL Query: Given 2 relations: Customers & Orders, find all Customers who have not placed an order since past 3 months. Q. DSA Problems: Given an array of numbers and a target number, find 3 numbers such that their sum is closest to the target. Given an array consisting of numbers and nested arrays, flatten it and return the resultant array. Round 4: In Person Technical (1-to-1) [45 mins] Q. Tell me about yourself Q. Internship Project (Architecture, Website & Data Flow, Code, Optimization, Internal working of JS methods used in project) Q. Personal Projects briefing Round 5: In Person Technical (1-to-1) [45 mins] Q. Tell me about yourself Q. DSA Problem: Right Rotate a linked list by k places. Q. Core Subjects: OPPs (Abstract Classes vs Interfaces, etc.) DBMS Q. Internship & Personal Projects briefing Round 6: In Person Technical (1-to-1) [45 mins] Q. Tell me about yourself Q. DSA Problem: Find & Return the loop point in a given linked list. Q. Core Subjects: OPPs (Interfaces, etc.) CN (TCP vs UDP, Why do TCP packets travel slower than UDP packets, OSI layers, etc.) Q. Internship summary Round 7: In Person HR (1-to-1) [30 mins] Q. Tell me about yourself Q. Where are you from? Q. How many members in your family? Q. How has been your experience in college away from your home?

There were total 5 rounds of interview in the hiring process of Energy Exempler. The difficulty increases as you go to the next round. first round was for checking our DSA knowledge along with some OOPS and DBMS concepts. The interviewer also asked me about my project in short.