How Codemia.io Helped Me Better Prepare for System Design Interviews?

A Better way to prepare for System Design Interview

Hello friends, if you are a senior engineer then you may know that System Design is such a vast topic and hard to master one. If you ask me, preparing for system design interviews was easily the most stressful part of my software engineering career.

Coding problems were manageable, especially after learning those coding patterns like two sum and fast and slow pointers, but designing scalable systems under pressure? That’s a completely different skill.

If you’re targeting FAANG or any top tech company, you already know: System design is often the round that filters out even strong developers.

While there are many great resources, books, and courses to prepare for System Design like ByteByteGo, Design Guru, Exponent, Educative, Bugfree.ai, and Udemy there are not many where you can actually practice problems and apply your learning.

I have used LeetCode a lot while doing DSA prep and missed the similar website for practicing System Design.

That’s when I discovered Codemia.io — a platform built specifically for practicing system design problems, similar to how LeetCode helps with coding interviews.

Master System Design Interviews Through Active Practice

And honestly, it filled a gap that had existed for years.

But that’s not all, they also provide editorial solution of most popular System Design question like URL shortner, these are expert created solution which touch base on all the key concepts you should mention on interview. I highly recommend you to check them to learn how to articulate your answers.

Now the site has also grown to even a more useful resource with mock interviews, AI assistance, and even DSA questions and become an indispensable resource for anyone preparing for FAANG/MAANG interviews.

Why System Design Interviews Are So Hard to Prepare For?

But first let’s see why System design interviews are so hard to prepare for?

Well, System design interviews test far more than your knowledge of tools and frameworks. They evaluate:

Your ability to design systems that scale
Your understanding of trade-offs
Your communication and architecture thinking
Your real-world engineering maturity

Interviewers aren’t looking for textbook answers. They want to see how you think when faced with ambiguity and constraints.

And that’s exactly where most preparation resources fall short.

The Problem With Traditional System Design Learning

Before finding Codemia, my preparation looked like this:

Watching YouTube videos
Reading blog posts
Skimming through architecture diagrams
Memorizing patterns like caching and sharding

But when I tried answering real interview questions, I realized:

Passive learning doesn’t translate into interview performance.

You don’t truly learn system design until you practice designing systems yourself — and that’s what Codemia.io is built for.

They have got tons of System Design questions which you can filter based upon several categories and difficulty level. You can even filter based upon which companies they are asked.

This is important because if you got a Meta interview coming up then you better prepare all the System design question asked on Meta in past and if you got an Amazon interview coming up, focus on those.

You can see all the System Design problem here.

What Is Codemia.io?

In case you have never heard, Codemia.io is an AI-powered platform designed to help developers practice system design and object-oriented design interviews through hands-on problems, structured guidance, and real-time feedback.

It’s essentially:

LeetCode for System Design

The platform includes:

A free system design course
Hundreds of real-world design problems
AI-generated feedback on your solutions
Built-in diagramming tools
Step-by-step expert solutions

They’ve also expanded into OOP design problems like:

Designing a Vending Machine
Designing a Parking Lot

These are frequently asked in FAANG interviews but rarely practiced by candidates.

Here is a list of all the OOP design problems you can solve for practice:

The Free System Design Course That Got Me Started

One of the best things about Codemia is that you can start learning without paying anything.

Their free course, Tackling System Design Interview Problems
covers all essential concepts, including:

Distributed systems
Database sharding and replication
Caching and CDN strategies
Load balancing and scaling
High-level and low-level design fundamentals

I really loved it and if you are new to System Design, I highly recommend you to start with this one.

Here is the link to join — Tackling System Design Interview Problems

This course helped me build a structured mental framework for approaching any system design question — something that’s incredibly hard to develop through random tutorials.

They have also added two new courses, one a more comprehensive one on System Design Fundamentals and one on Agentic AI, which is a must know topic for any software engineer.

Practicing Real Interview Problems Made the Biggest Difference

The biggest turning point in my preparation was when I started solving actual design problems instead of just reading solutions.

Codemia has one of the largest collections of system design problems available online:

You can Browse all system design problems here.

Some of the problems I practiced include:

These problems simulate real interviews, forcing you to think about:

scale
latency
fault tolerance
data modeling
API design

AI Feedback Helped Me Improve Faster Than Self-Study

One of Codemia’s most powerful features is its AI-driven feedback system.

After submitting a design, the platform evaluates:

scalability
bottlenecks
trade-offs
architectural clarity

This mimics having a senior engineer review your design — something that’s very hard to get when you’re preparing alone.

That feedback loop helped me refine my thinking and avoid common mistakes that I didn’t even realize I was making.

Built-In Diagramming Tool Made Interview Practice More Realistic

In real interviews, you’re expected to explain your architecture visually.

Codemia includes an integrated diagramming tool where you can create:

data flow diagrams
component architectures
sequence diagrams

This helped me practice explaining designs clearly — a skill just as important as technical correctness.

A Clear System Design Roadmap Removed the Guesswork

One major challenge in system design preparation is not knowing:

What should I study next?

Codemia solves this with a structured roadmap that organizes problems by:

topic
difficulty
and company patterns

This allowed me to progress from beginner-level systems to complex distributed architectures without feeling overwhelmed.

Why Codemia.io Is Worth It Compared to Other Resources?

There are many great books and courses on system design like ByteByteGo, Design Guru, Exponent, Educative, Bugfree.ai, and Udemy, but Codemia.io stands out because it combines learning + practice + feedback in one place.

Instead of juggling:

YouTube
blogs
whiteboard tools
mock interviews

You get everything in one platform:

Here is the link to — Join Codemia.io

They are currently offering a 40% discount, bringing the yearly price down from $99 to $55.20, which makes it one of the most affordable ways to prepare seriously for system design interviews.

While their annual plan is most popular, I recommend their lifetime plan because that provides the best value. Since you always need System design whenever you want to go for next opportunity it make sense to just buy one time and use anytime you need.

Final Thoughts: Is Codemia.io Worth It?

If you’re preparing for:

FAANG interviews
Senior backend roles
System architecture positions

then practicing system design is not optional — it’s essential.

And from my experience, Codemia.io is one of the most effective platforms available today because it focuses on what actually matters:

Active practice and real feedback

If you want to improve your confidence, clarity, and performance in system design interviews, this platform is absolutely worth trying. You can start practicing on Codemia.io today.

Master System Design Interviews Through Active Practice

P. S. — If you are completely new and don’t have much idea about System design and a visual learner then I also suggest you join ByteByteGo and start learning System Design concepts first before you practice problem on Codemia. This will really help you and you will thank me later. I used combination of these two resources to crack multiple interviews last year.

System Design · Coding · Behavioral · Machine Learning Interviews

P. S.S. — And, if you need quiz questions and practice test to level up your System Design knowledge, then you can also checkout this System Design Interview Mastery 2026 course on Udemy. It contains practice test on system design fundamentals and scenario based question to challenge your System Design skills.

How Codemia.io Helped Me Better Prepare for System Design Interviews? was originally published in Javarevisited on Medium, where people are continuing the conversation by highlighting and responding to this story.

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