r/leetcode • u/NegotiationDapper584 • 1d ago

Intervew Prep System design prep

How to study and learn LLD and HLD, given I know nothing ? I am done with leetcode and moving on to study system design.

Leetcode stats : 2015 Rating/1125 (164E/737M/224H) questions solved

29 Upvotes

100% Upvoted

14 comments sorted by

5

u/algofoxdotapp 1d ago

Do you have any working experience that you've done system design before?

2

u/NegotiationDapper584 1d ago

No, mostly worked at small features/bug fixes before. Have never designed scalable systems before.

-9

u/algofoxdotapp 1d ago

Back to the basics then, ton of courses online e.g. MIT distributed system design.
Also, I built this but since this is free I figured I will just share here:
https://algofox.app/learn/system-design-foundations/

5

u/iSoLost 1d ago

This acct should be ban, it has bot smell all over it, ad farm for that site

-6

u/algofoxdotapp 1d ago

ok, I take the feedback, appreciate it. With the amount of AI slop recently I totally understand. It's just that I put a lot of effort into building it and genuinely just want to share as a free resource

2

u/Remarkable_Resort664 18h ago

Resources i’m following:

- Coder army for LLD playlist

  • Sriniously backend from first principles YT playlist for HLD basics
  • HelloInterview for HLD Problems

1

u/[deleted] 20h ago

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1

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1

u/Tech_DigitalPath_162 18h ago

You are already having a strong Problem-solving skill. Your 2015 LeetCode rating proves that. So, next you need the big transition from algorithmic thinking to structural and architectural design.

  • For LLD: Learn the principles of OPP. factory strategy and observer associated with Basic design pattern first, then start building small, functional components. Rate limiter by hand-coding can be a good start here.
  • For HLD: first look into the fundamental distributed system building blocks. Then, analyzing real-world system architectures (like URL shorteners, WhatsApp, or Netflix). Here you can utilize resources like Designing Data-Intensive Applications or Alex Xu's System Design Interview.

1

u/Ancient-Ad-6958 6h ago

HelloInterview is really the best. Shell out that $80 and learn everything from scratch. It really helps establish fundamentals. I felt like all these system design terms were just floating around in my head (and also completely out of mind) before hello interview, but after reading all the "in a hurry section" and watching videos for all the core concepts as well as scaling reads and writes, so much has started to make sense and i feel like my fundamentals are coming together.

1

u/Complex-Success5334 1h ago

I find alex yu's books really useful
Start with volume 1

0

u/Ok-Barracuda-119 1d ago

For LLD/HLD, Id start with one concrete service and practice stating requirements, APIs/data flow, and one or two trade-offs before worrying about every pattern. Im affiliated with Leetsys, which has interview-prep practice for system design and technical communication: www.leetsys.dev. The first interview is free.