There were 4 rounds in total (including OA). (OA]1 - The most difficult round, 10 qs in total, needed to be answered by speaking, some were MCQs and some were purely objective 2 - Intro Call (30 mins] (basic software engineering questions like Relational vs Non-Relational DBs, Authentication vs Authorisation type) (rigorous discussion on current work experience] 3 - Applied System Design Round (1 hr) - was given a good problem statement of handling incoming leads, enriching them using third party services and storing & providing the current statues of each one for which i was asked design whole architecture. Should have good knowledge of queues, load balancing, rate limiting algos, db locking, cache locking, maintaining idempotency, concurrency (advanced high level system design knowledge required) 4 - cultural fit type round (15 mins)