Today, we’re launching the Frontend System Design Playground on IOCombats.
Most system design preparation looks like this:
Read a question → study a solution → watch someone explain it → move on.
But real interviews don't work that way.
You need to clarify requirements, make architectural decisions, explain your components, think about edge cases, and eventually write code.
So we built a staged, interactive interview experience that lets you practice exactly that.
You go through:
🔹 Requirements clarification
🔹 High-level architecture
🔹 Component deep-dive
🔹 Code implementation
🔹 Self-review against a practical checklist
At the end, you can compare your approach against reference notes covering things candidates commonly miss, including performance, edge cases, and requirements.
And it's completely free.
We're building the next layer on top of this too:
🤖 AI Review
👨💻 Expert Review
👥 Community Review
The goal is simple:
Make frontend system design practice as accessible as DSA practice.
Not another course.
Not another collection of system design articles.
Actually practice the interview.
Try it on IOCombats:
👉 https://iocombats.com/system-design-playground
This is another step toward our bigger goal: helping frontend developers practice, prove their skills, and get hired faster.
Top comments (3)
A playground makes sense for frontend system design because the hard part is usually tradeoff practice, not syntax. Caching, state boundaries, accessibility, responsiveness, and failure states are easier to learn when you can simulate them.
Thanks Alex, that's exactly the thinking behind it. Simulating them, even at a small scale, builds the instinct interviewers are actually testing for. Appreciate you putting it into words this well.
That simulation angle is useful because it makes tradeoffs visible. A candidate can say "virtualize the list" or "cache the data," but the playground shows whether they understand where latency, memory, accessibility, and state ownership actually move.