Build the instinct to design under pressure.
A focused workspace for the decisions that separate a diagram from a production-ready system. Practise, defend, learn what you missed.
Shadow interviewer
Signal so far · 68/100
Not another course. A place to build the reflex.
A better feedback loop
Experience is the curriculum.
The fastest way to become better at design is to make decisions, encounter the sharp edge, and understand the trade-off.
Practise the shape
Use a real canvas, not a blank text box. Map boundaries, data, and dependencies.
Defend the choice
A shadow interviewer asks the counter-question your diagram is avoiding.
Close the gap
Leave with a score, concrete next steps, and a better prompt for tomorrow.
One workspace, three lenses
Zoom in without losing the system.
Move from high-level boundaries to database constraints to low-level abstractions. Your design stays connected as you go deeper.
Shape the system
Services, gateways, queues, caches, and failure paths.
Model the truth
Tables, keys, indexes, constraints, and consistency.
Make it buildable
Classes, interfaces, methods, and patterns.
A clear path to ready
Know what to practise next, not just what you got wrong.
Your readiness map grows from the quality of your decisions: system boundaries, data choices, failure modes, and how clearly you communicate them.
Requirement clarity
You make the unknowns explicit before drawing infrastructure.
Trade-off quality
You can explain why this choice wins under these constraints.
Failure handling
You have a credible answer when the happy path breaks.
Readiness map
Updated after each interview
Strong fundamentals · next: failure modes
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