r/lldcoding

Recenty got offer from Amazon after wise.

My Prep

DSA - Majorly Amazon Tagged question. I was already preparing for other interviews, so was not worried much about this. Majory Used Leetcode.com

LLD - I was not doing good there, was confused what to follow from multiple sources, got to know from friend about LLDcoding.com and few other resource. He already had their course, so i kind of saw the content, majorly on concurrency, found it interesting and helpful. so bought the course before 1 month.

HLD: Same like LLD, was not confident much about this, since i have not given much interviews on HLD, I was watching gaurav sen, bytebytego and hello Interview content. Since i prefer text content more, i focus on hello interview more.

YOE: 4 yrs.

Prev: Faang level company.

Hey everyone,
I’m currently interviewing for backend roles and hitting a massive brick wall when it comes to Low-Level Design (LLD) rounds.
My background is almost entirely in Node.js and TypeScript. During these LLD interviews, the interviewers expect a fully working solution code by the end of the hour. Here is the issue: a ton of standard LLD interview questions seem to heavily expect thread-based concurrency paradigms.
Because Node.js is single-threaded (event loop), I can’t exactly pull out a ConcurrentHashMap, showcase thread-safe singletons, or implement custom mutex locks/semaphores natively the way a Java or C++ dev would. When I try to explain how I'd handle it conceptually, it feels like it falls flat because they want to see the actual implementation in the code.
I’m feeling stuck.
• Should I just bite the bullet and learn Java from scratch strictly to clear LLD rounds?
• If you stick to TypeScript for LLD, how do you simulate or handle concurrency questions effectively to satisfy interviewers who are clearly used to JVM ecosystems?
Has anyone else faced this? Would love some advice on how to approach this.

I am thinking about adding peer mock interview, since we have many users, we can schedule their mock interviews with each other for LLD, and if quality of the mock interview is high, both individual will be paid 500rs. All Mock Interview will be recorded and will go to youtube...

Quality of interview does not mean how intervieww performed, its about the conduct of interviewer where he/she is providing real interview experience, and other user also.

Rating can be based on our internal team OR crowd ratings.

For all Interviews Camera needs to be for both. It should be real interview.

I understand if someone perform bad, he/she might not want to get their video uploaded, in that case they can pay 300rs from which 250rs goes to interviewer (if his conduct was proper). In that case we will not be uploading that video to public access. it willl be only visible for interview giver.

is anyone open/available for peer mock interview ?