HR contacted me via LinkedIn, and we arranged the first initial interview. It was about 30 minutes long. They told me about Facebook projects and asked a few questions about my experience. A week later, I had a phone coding interview, which included one LeetCode easy and one LeetCode medium problem. I received feedback in one week and an invitation for an on-site interview.

The on-site interview consisted of five interviews and a lunch interview. The first was a behavioral interview followed by a coding interview. Then came a design interview and three more coding interviews. The coding interviews were not too difficult, with two medium-level tasks for each interview, covering basic concepts. In the behavioral interview, I received many questions about my past experience and hypothetical situations, followed by a 15-minute easy coding question.

The design interview was the most challenging for me. I received a question, started to answer, and was then interrupted with more detailed questions about specific parts of my system, and so on. I didn't perform well in this interview, but I found it very useful because it highlighted gaps in my knowledge and areas for improvement.

I received the final feedback 10 days after the last interview. It wasn't just a yes/no, but also included some details (no offer; all coding interviews were good enough; behavior was good; design skills need improvement).

It was my first experience with an on-site interview at a large company, and I really liked the interview process. HR provided all necessary information: the next steps, when to expect feedback, etc.

A few tips I wish I had used before the interview:

• Prepare for the design interview, not just coding. Know everything you put on your CV. If you are not sure you have deep knowledge in something, it's better not to mention that technology at all.
• Prepare good questions for the interviewers. They would expect you to ask them.

I'm not sure I'm able to share it due to an NDA.