Javarevisited: Is Codemia.io Best Place to Prepare for System Design Interviews in 2026? Review

Hello guys, if you are preparing for tech interviews then you may know that how important System design interviews are. In this highly competitive job market where everybody is a Leetcode God, its no longer only thing you need to crack Software engineering interview. Instead, you also must have good knowledge of System design and software architecture, particularly if you are an experienced developers to go past first few rounds.

I have been sharing a lot of system design resources like best System Design courses, books, websites, newsletters, cheat sheets, mock interviews, blogs, tips, GitHub repo and white papers, in past few weeks but one thing which was missing on it was active practice website where you can solve System design problems like you solve DSA problem in Leetcode .

I kind of love Leetcode because it give me joy when I solve any problem without assistant but with system design its not like that, first its hard to understand system design problem and then its a discussion which can be best done with two or more people.

If you are a solo learner then you will feel asleep in 5 minutes you started reading any system design books like “Designing Data intensive Application”, or “System Design Interview - An insider’s guide” which may kept you awake a bit longer.

But the point is there is no Leetcode like resource for System design prep, but not any more.

Enter Codemia.io, which is created to fill this gap and allow you to practice System design problem in Leetcode style.

This website provides more than 120+ popular system design problems which you can practice system design problems like the way you practice data structure and algorithms on Leetcode.com.

It has many free questions which you can solve and many locked questions which are available to member and you can get membership for just $69 at the moment which is nothing but cost of a book and definitely worth investment. You can learn more about pricing here

Now, let’s deep dive into this brand new platform to learn System Design by solving problem and find out what its worth.

They have also expanded their catalogue and added many new System design questions as well as 130+ questions on data structures and algorithms, Object Oriented Programming and design.

They have also improved their AI features and make it much easier and effective to practice System design problems online.

Also they now have biggest collection of company wide system design problems which means if you have interview with Amazon, you can see what questions were asked their and practice accordingly.

What is Codemia.io?

Codemia.io is a new website which allows you to practice System design problems in Leetcode style. It has both free and paid System design problems for practice.

There are total 120+ System design questions, many of them are taken from past interviews like Designing a URL Shortner like TinyURL, Designing a Chat System like WhatsApp or a Video Stream platform like YouTube, or a Music streaming platform like Spotify.

Most important thing is they provide a structure through which you can solve or approach a System design problem like Functional and non-functional requirement, back of envelop estimation, API Design, High and low level design, database design, and component designs.

It also covers Object Oriented Design and Machine Learning System design which is closely related to system design to provide a complete preparation.

One of the best thing about Codemia.io is AI feedback and quick evaluation which gives you feeling of accomplishment and also encourage you to correct and learn more.

You basically pick a problem, write down your solution in the structure they provide, which covers many key steps.

You then receive feedback from AI and you can also share solution for further feedback. This feedback loop makes learning engaging and rewarding.

Here is the link to learn more about Codemia.io — Join Codemia

How Codemia.io Helps to Practice System Design Problems for Interviews?

Here is an example of how you should approach a System design problem on interview, in this example we will use the URL shortening problem which is mostly asked on FAANG and tier 2 tech companies:

1. Functional

First thing first, you should list functional requirements for the system (Ask the chat bot for hints if stuck.)… Yes, Codemia.io also has a Chat bot which can be used as a companion while solving system design problem.

2. Non-Functional

List non-functional requirements for the system… like failover, avaibility, security, logging etc

3. Capacity estimation

Estimate the scale of the system you are going to design… like how much storage you will need, network bandwidth, RAM, CPU, Servers, cost etc.

4. API design

Define what APIs are expected from the system…

5. Database design

Defining the system data model early on will clarify how data will flow among different components of the system. Also you could draw an ER diagram using the diagramming tool to enhance your design…

6. High-level design

You should identify enough components that are needed to solve the actual problem from end to end. Also remember to draw a block diagram using the diagramming tool to augment your design. If you are unfamiliar with the tool, you can simply describe your design to the chat bot and ask it to generate a starter diagram for you to modify…

7. Request flows

Explain how the request flows from end to end in your high level design. Also you could draw a sequence diagram using the diagramming tool to enhance your explanation…

8. Detailed component design

Dig deeper into 2–3 components and explain in detail how they work. For example, how well does each component scale? Any relevant algorithm or data structure you like to use for a component? Also you could draw a diagram using the diagramming tool to enhance your design…

9. Trade offs/Tech choices

Explain any trade offs you have made and why you made certain tech choices…

10. Failure scenarios/bottlenecks

Try to discuss as many failure scenarios/bottlenecks as possible.

11. Future improvements

What are some future improvements you would make? How would you mitigate the failure scenario(s) you described above?

You can see that its a very detailed way to solve a problem and touch based almost all part of system design. It also comes with a whiteboarding and diagram tool which allows you to draw diagrams, another key expect of system design.

15 Easy System Design Problems for Interviews 2026

Codemia.io have a huge list of system design problem you can practice. They are divided into different categories like Easy, Medium, Hard, and Advanced.

You can start with easy ones first, many of them are also free but for others you need to take subscription which cost around $69 per year, not that costly.

Here is a list of Easy System design problems to start with:

While few questions from this list is absolutely free for others you need to take membership but that’s worth it because you get AI feedback and also access to 75+ high quality solutions.

You can see the full list of System design problem on Codemia here

Codemia.io vs DesignGuru.io vs Educative’s System Design Interview

Now when it comes to comparing Codemia with other popular System design preparation website like Design Guru, and Educative , here is how they stack with other.

You can see that Codemia.io got the highest number of system design problem, almost 120+ and the list is still growing, compare that to handful of System design problem with DesignGurus.

It also got interactive learning and AI feedback which is not available yet on other system design learning platforms.

It also got Structural breakdown of System design problem which is probably the best thing about Codemia.io and also not available on other platform.

It also has a community where you can ask questions, clarify doubts and get your solution reviewed, which is amazing for anyone preparing for System Design.

I highly recommend to join Codemia to prepare well for System design in 2026.

Is Codemia.io Really worth it for System Design Interview?

Codemia.io is definitely worth 100% for its huge collection of System Design problems, a structured approach to solve those problems, feedback from AI for continuous improvement and a supporting community for further learning.

I highly recommend you to join Codemia.io to anyone who is preparing for System design interview.

It not only provide a Leetcode style active learning platform on System design but also its AI feedback makes learning really engaging and rewarding.

It also got 120+ high quality questions and 75+ high quality solutions on common System design problems most asked from Google, Amazon, Apple and other top companies .

Overall it provides a a better way to prepare for for System Design Interviews. By joining Codemia.io, you can save months of study, have better retention and achieve deeper understanding!

It’s also very affordable and with just $69 per year, the price is nothing compared to other System design platforms like ByteByteGo, Design Guru, Exponent, Educative and Bugfree.ai.

In short, a great platform for System design preparation and I highly recommend it. If you are in hurry, just go and join Codemia.io and you will thank me later.

Here is the link — Join Codemia.io for $69 Now

And here is what other people are saying about this website

You can see the feedback is quite positive and people are enjoying solving System design problem on Codemia, which is a big big advantage for system design learners

That’s all about Codemia.io, a Leetcode style website to learn System design for interviews. Codemia.io is 100% worth it for anyone preparing for system design interview due to its 120+ popular system design problems, 75+ high quality solutions, AI driven feedback and interactive learning experience.

It also provide a comprehensive structure which you can use to solve any System design problem. It’s also one of the rare website which is equally good for both beginners and experienced developers.

Over all a great resource for System design interview and I highly recommend it. You can learn more about Codemia.io here.

Other System Design Articles and Resources you may like

Thanks for reading this article so far. If you like this review of Codemia.io, a new website for system design preparation then please share with your friends and colleagues. If you have any questions feel free to ask in comments.

Javarevisited

Wednesday, January 14, 2026

Is Codemia.io Best Place to Prepare for System Design Interviews in 2026? Review