Sigmoid Software Development Engineer (SDE) interview questions

see this is oncampus drive of sigmoid analytics First OA conduct where 8 coding questions there which was medium level and then MCQs are there of core cs subjects like os, dbms, aptitude part comes interview experience- there are 3 rounds of my interview 2 Techinal + 1HR First two rounds held virtual 3rd round is offline Round1 - they asked me in my resume in projects that in backend what is cors policy + then they asked 3 DSA quesions like valid anagrams, climbing stairs of recursion then optimise by DP + inimum insertion to make string palindromic All codes are write on complier and test case should run which they given last they give me question one SQL query to write which is easy as per leetcode Round2 - they asks me OOPs concepts because i mention c++ in skills so they asks me oops in detail like what is run time polymorphism and complie time polymorphism, data.slice and some words i remember that unique type interviewer ask, 3 DSA asked one is top k frequent element from leetcode, 1 from linked list that delete the nth node, 1 of BST that you have BST so find total unique pairs in which two nodes get summed result k find count of total pairs Round 3 - they ask full on projects that explain full architecture of project in project go in deep, they also given 1 SQL question that find 2nd highest value from given data, difference between SQL and NoSQL if someone asks which DB should use how you suggest that person what is vertical and horizontal scaling and some deep questions on projects

The selection process consists of four rounds in total — an Online Assessment (OA) followed by two Technical Interview rounds, and finally an HR Interview round. Each stage evaluates different skills, including problem-solving, technical knowledge, and overall personality fit.