Codemia

Codemia helps you prepare for system design interviews through hands-on practice instead of passively reading notes and articles. It uses an exercise format similar to LeetCode-style training, but focused on real architecture scenarios.

Practice system design like a real interview

You’ll work through common interview prompts, from designing a file storage service like Dropbox to building high-traffic systems. The workflow encourages you to:

• Define requirements and constraints
• Design core components and data flows
• Plan for scalability and reliability
• Compare your approach with reference solution breakdowns

From OOD to ML system design

In addition to classic system design, Codemia includes modules for object-oriented design (OOD) and ML system design. This supports preparation across multiple interview types:

• Backend architecture and distributed systems
• Class design and OOD interviews
• ML system design and supporting infrastructure

Structured feedback to spot gaps

After completing tasks, you can review structured feedback to see what you missed, where requirements weren’t fully addressed, and which trade-offs could have been made differently.