1. HackerRank OA -> medium and hard leetcode problems. Was able to solve 60% of the test cases. You may find the same questions online. But try to first solve it yourself, will save a lot of time.
2. Coding round -> Binary seach based, minimum of all maximum problem. Cover all the cornor cases. (similar to)
3. Coding round -> Leetcode hard problem. Graph DFS problem. variation of topological sort.
4. Design round -> Design scalable letter printing service.
5. HM round -> Behavioral questions. / Focus on Twilio magic values
6. Bar raisers -> scenario based/Behavioral questions / Focus on Twilio magic values

Tips : For coding, be calm and discuss with the interviewer about the possible solutions and ask for hints. Try leetcode medium graph questions (bfs/dfs/topological sort).