Atrenta Software Engineer interview questions

One hour phone interview.

1. Written Test 2. Personal Interview Written Test: 1. C based questions 2. Digital Circuits 3. Aptitude PI: 1. Tell me about yourself?? 2. Asked me to write a code to print a matrix in helical fashion. 3. Some questions on operating system Topics: Multi-threading , semaphores, 4. Data structure based questions 5. Some HR questions