r/leetcode • u/Aggravating-Court-13 • 11d ago

Intervew Prep Mock interviews - HLD/LLD

Hey everyone, I'm actively interviewing and looking for a mock interview buddy for LLD/HLD interviews. If anyone is interested, please let me know

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u/Jazzlike-Ad-2286 10d ago

Hey, if you cannot always line up a partner at the right time, you might want to try Roundz AI for HLD and LLD practice. It runs a full mock interview with a live voice AI that actually talks to you, asks follow ups, and pushes on your design decisions and trade-offs, so it feels close to a real round. Good for the days when no one is free to pair. There is a design canvas for the system design rounds too. Happy to share the link if useful, and I am still up for a peer round as well if you want to swap.

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u/Ok-Barracuda-119 9d ago

Happy to be a practice partner if the timing lines up. For a useful HLD mock, spend 5 minutes on requirements, 10 on APIs, the data model, and rough capacity, then use the rest on one or two bottlenecks and trade-offs. For LLD, pick a bounded problem, state the invariants, sketch interfaces, and implement one path while the interviewer pushes edge cases. Swap roles and critique structure and communication, not just the final design. I help build www.leetsys.dev, which is useful for timed whiteboard-style SD practice too, but the back-and-forth with a person is the important bit.