Facebook Onsite Experience

Had my Facebook Onsite today. Position interviewed for : E5. 1st round: Behavioral + coding - For the most part the interviewer only asked behavioral questions related to my past experience and projects. We had a good conversation on each topic and he built follow up questions based on the answers I gave. The time flew by and in the last 3 minutes, he opened up the platform for me to ask question. Overall I felt that this round went well but I am not 100% confident since he didn't ask any coding question on this round. Is there an expectation to definitely do coding on this round? 2nd round: Product design - The interviewer gave the problem statement (mainstream product that we use very often) and asked to design end-to-end flow for it. I started with functional requirements, capacity estimation and moved on to API and component design. The interviewer pretty much agreed to whatever I said and considering the time in mind, she asked me to drive the discussion in a specific direction and around caches, security etc. I think she was looking to see if I am covering all the key characteristics of distributed system. I was able to proceed in the direction she wanted and answered all the follow up questions. Overall I felt that it went well and the interviewer also mentioned that it went good. 3rd round: Coding - The interviewer mentioned that he is going to ask only 1 question and its a LC hard I haven't seen before. I started the problem by discussing all the possible types of input cases and proposed a recursion solution. I made a small mistake with time complexity but interviewer gave me a different input and I found the correct time complexity using that input. With implementation, I made a small mistake with the recursive call and as the interviewer pointed that out, I was able to fix that as well. At the end, he gave thumbs up for the solution but there is definitely room for improving this solution by memozing it etc. In the last few mins I mentioned that we could improve this solution but I didn't have time to do it. Overall I think it went OK (I was able to solve) but not great. 4th round: Coding - He gave a LC medium problem I haven't seen before. I discussed the problem with different inputs and came up with a solution but I think he is not convinced much with my solution. For most of the time he was trying to break my solution with different inputs and my solution was working for all the inputs. I also tried my best to help him with the inputs but my solution was working for that as well. We are already 30 mins into the interview and I haven't coded yet. Finally, he said OK for my solution and I gave the time complexity and I coded it in the last 8 mins. I was able to solve but had I got some more time to code, I would've written a much cleaner code. I was also not sure if he had another question in mind as the first one was LC medium and I also think he took a lot of time to understand how I am approaching the problem and didn't let me code until the very end. Is this something I should convey to my recruited just in case this round becomes a bad sign? 5 round: Coding - The recruiter said that its a calibration round for the interviewer and most likely will not be considered for evaluation. It's a LC hard and I have seen a similar version of it but its a lot of code to write. I explained my approach, coded it for most part of my interview and ran test cases with it and discussed time complexity. Overall it went great and we are right on time. (It's a bummer for me that this round will not be considered for evaluation). What are your thoughts on each round in regards to how it went and what are my chances?