Reach senior frontend level, faster.
Practice with an AI interviewer anytime, for your level and target company. Find your weak spots, improve.
5-minute session. No card required.
The old way to pass a system design round is dead.
Too slow. Too expensive.
Reach senior frontend level for less money and less time. No tutors. No endless searching. No three-week grind.
The old way
Slow. Expensive. No structure.
- Pay €100–200 per mock with a real engineer.
- Hunt Reddit, Glassdoor, and Blind for what companies actually ask.
- Piece your prep together from YouTube clips.
- No structured feedback. No next steps.
- Schedule around someone else’s calendar — wait days for a slot.
With Design RoundFaster. Smarter. Cheaper.
- Run dozens of mocks on your schedule.
- Real questions sourced from those forums, curated and ready.
- See your weak spots — and work to close them.
- A score and a hiring decision after every mock.
- One product. Practice, feedback, and materials in the same place.
How it works
A practice routine that tells you exactly what to fix before your next interview.
- 1
Pick a scenario· 30 sec
Choose from a library of realistic frontend system design prompts — from Google Docs clones to real-time collaborative whiteboards.
- 2
Run the mock interview· 45–60 min
A staff-level AI interviewer built on the methodology from the Advanced Frontend Course and years of system design breakdowns on YouTube. It pushes you on requirements, trade-offs, and scale the way senior interviewers do.
- 3
Get detailed feedback· Instant
Every session ends with structured scoring, a full transcript, and a mock hiring decision you can actually act on.
- 4
Spot your weak points· In your dashboard
The evaluation pinpoints exactly where you fell short — missed requirements, shallow deep-dives, poor trade-off analysis — and explains why.
- 5
Study the editorial materials· At your own pace
Jump into curated deep-dives matched to your weak areas and level up the concepts that actually matter.
- 6
Repeat· After every session
Run another scenario armed with what you just learned, and watch your scores climb session after session.
Trained on real interviews.
Built by someone who actually sits on the other side of the table.
After years of leading teams and conducting hundreds of technical interviews, I got tired of prep tools that don't reflect what we actually ask in the room. I built this to simulate real architectural deep-dives.
Trained on questions companies are asking right now.
We don't use generic AI prompts. The scenarios and expectations are built using real, recent interview reports from Glassdoor, Blind, and developer communities — and refreshed continuously.
Where the data comes from.
Every scenario is grounded in real, recent interview reports pulled from open developer communities — and refreshed continuously.
Invest in your senior transition
Master system design, navigate complex trade-offs, and land the staff-level offer. Pause or cancel anytime.
Pro
Practice + exclusive lessons + access to course videos.
€84 billed every 3 months
- 25 mock interviews / month
- Everything in Basic
- Exclusive preparation materials
- Access to the course videos
The senior decision framework — architecture, state, APIs, real-time, testing, and deploys.
Basic
AI interviewer, scoring, and basic prep materials.
€45 billed every 3 months
- 10 mock interviews / month
- AI-graded across 7 dimensions
- Final written evaluation
- Weak-area detection
- Basic preparation materials
Compare plans
Before
The Coder
- First in line to be replaced by AI — writing features is exactly what models ship today.
- Salary ceiling around €55k in Europe, $130k in the US — and the gap to senior only widens.
- Harder to find jobs — the market wants system thinkers, not another pair of hands.
- Harder to get promoted — a subscription is cheaper than a raise.
AfterThe System Architect
- AI-proof — you design the systems AI writes code inside of.
- Around €80k in Europe, $180k in the US — and the curve keeps climbing with scope.
- In demand everywhere — every team needs someone who can own the architecture.
- First in line for promotion — you own outcomes, not tickets.
Frequently asked questions
Everything you need to know before your first session.