Invent Design Build interview questions

The first interview round was a telephonic conversation regarding my CV and an assessment of mutual interest in the company and type of work. The second round was technical where I was asked to point out errors in code snippets and asked questions about RTOS and it's workings. I was also asked to code a string concat operation. Finally, the third onsite round involved general discussion about my experience, an introduction to the company and its office, and I was asked to make a presentation about a complex software project I worked on.