I applied through Campus. It was a whole day process. Only those who were shortlisted were called for the day. First round was Hackathon. Group of 5 candidates were formed into a group. A task was given to prepare an app/webpage for fitness tracker. My group included java guys, who did a similar project recently. they had that ready made result already with a lot of new-to-me things like mqtt,publisher, subcriber, brocker etc. Also came to know more about Node-RED. It was a good oppurtunity to learn new things. And that was the good thing that I felt at the end of the day. Good luck with the task and most importantly the group you get!