1st round: DSA round: markdown to html (positive feedback. Only one -ve feedback that I ran the code only after implementing it completely).
2nd round: Managerial round got scheduled earlier. General behavioural question like: “tell me a time when… “. Interviewer was cool and discussed my open questions in depth related to responsibilities of individual dependending on the level.
3rd round: DSA round: Implement library for command line command. You may find this related question in some past experience. It’s very easy as it required basic string parsing and little bit tricky with follow up questions.
4th round: System Design Round: User uploads csv files with list of transactions. User should be able to view relevant info on the UI. Designed the high level flow explaining each component and choice of tech. In depth discussion on data base I used, how will I query the logs, how would I detect the fraud with other given information.

Verdict:
[Rejected] Scope of improvement in design skills.