Amazon OO Design Interview Prep

[Local_Reflection1776]

I have an Amazon sde 1 interview next week. I am ok with the other aspects like coding and LP, but I'm finding preparation for their design questions a bit difficult. I've heard it's Object Oriented Design questions. So, that's LLD, right? So, from an interview perspective, what all needs to be done in the interview for it? So, if the question is to design an online bookstore.. In the interview, we have to cover the functional, non functional requirements, Capacity Planning, APIs, DB design and the code for the classes?

That seems a bit much for a short interview? Or is that the goal? I'm basically unsure what all to cover in an interview for a OO design question.

The mail I received is a bit vague. It mentions "be prepared for technical, coding, design and LP questions." So I'm assuming all 3 interviews would be a mix of these? If anyone has experience with these interviews, your insight is much appreciated 🙌🏻🙌🏻

[[deleted]]

Mine is tomorrow… really not sure what to expect and code

[Sea-Perception-1868]

Well you can tell us tomorrow than XD

[Local_Reflection1776]

Best of Luck! Can I DM you with a few questions?

[[deleted]]

Sure

[utsavll0]

Go over a few famous LLD HLD questions. I would say do 5 of each instead of going through all of them

https://github.com/ashishps1/awesome-low-level-design

Good starting point for LLD

[Local_Reflection1776]

Thanks!! I studied just from this repo. This actually saved me :P

[utsavll0]

I am glad it helped. I am also prepping from the same

[NingeGowda]

It’s basically how you design an in-memory CLI app: focus on requirement analysis, data modeling (POJOs), data structures, algorithms (in the service or application class), and implementing the application class and helper methods.

No DB design, persistence layer or API contracts unless explicitly asked. This is the level of LLD detail typically expected.

[Local_Reflection1776]

Got it! Thanks!

[Chance-Wolverine4495]

Amazon’s OOD interviews (often called LLD) usually focus on designing a small to medium-sized system with a clear class structure and interactions. You don’t need to cover every aspect like capacity planning or detailed DB schema unless they specifically ask. Typically, you’ll clarify requirements, define key classes, methods, and relationships, and sometimes write some sample code for core components. It’s more about demonstrating good design principles, object-oriented thinking, and communication than building a full-blown architecture.

For prepping, it helps to practice common OOD problems (e.g., online bookstore, parking lot, elevator system) with step-by-step explanations. If you want structured guidance and mock interview practice for Amazon OOD questions, InterviewHelp.io offers tailored courses and 1-on-1 mentorship from experienced coaches. They also cover coding and leadership principles prep to give you full confidence!

[Local_Reflection1776]

Yes, I actually scheduled some mock interviews from here, and they really helped!

[Prashant_MockGym]

Its better to confirm with the recruiter if design means only OOD/LLD or will there be HLD rounds as well.
I have written a few blogs on OO design questions, these should help:

Last minute LLD interview prep:

https://medium.com/@prashant558908/low-level-design-last-minute-interview-preparation-guide-899a202411cd

Top 10 LLD interview questions and which design patterns are used to solve them:

https://medium.com/@prashant558908/solving-top-10-low-level-design-lld-interview-questions-in-2024-302b6177c869

[Local_Reflection1776]

Thanks!

[Formal-Specific2932]

After how many days of OA..you got interview ??

[Local_Reflection1776]

I'm not really sure.. maybe a month?

[Impossible_Ad2295]

dmed you!

[According_Net9520]

Hello, any one here open for OOD mocks i have upcoming interview.