Quantiphi Software Developer interview questions

In the technical interview following questions were asked - 1. The interviewer first asked me to brief about my projects. 2. I had mentioned GitHub in the version control systems, so he asked me how can multiple people work on the same version. 3. He then asked me some questions based on Data Structures such as sorting, searching algorithms, their complexities (explain the time complexity of heap sort), questions on stack and arrays (use of the stack in the computational environment), linked lists (write a code to find a loop in the linked list), some cases where stacks can be efficient and some cases where linked lists can be efficient. 4. He also asked some questions based on the database, such as client-server architecture, how to handle thousands of simultaneous requests to the server, a question related to my work on firebase as I had mentioned it in my resume. Questions asked in HR interview - 1. Introduce yourself. 2. How did you find today's interview process and any suggestions? 3. Tell me about your family. 4. In how many companies did you apply before Quantiphi and in which round you got rejected and why? 5. Things on which you think you need to improve on considering the technical background.