I applied online, got a call in a month. Had an online HR pre recorded interview with pretty easy questions with a practice interview.Followed in a week by an onscreen Hackerrank interview with coding in any two languages of choice. This was pretty fast with interview questions of moderate level testing basics, but need to think fast due to less time.Later followed in a week by a technical phone interview for half an hour. Asked questions on signal processing like : How is auto correlation related to white noise, transforms, matlab libraries, transforms, auto and cross correlation and similar to the ones on Glassdoor. Code snippets in two languages of choice involving manipulations of signals, pointers, inheritance, abstraction, etc.