Practice system design as a guided interview skill, not just a theory article.
Choose frontend, backend, or full-stack tracks, draw architecture diagrams, explain tradeoffs, receive automated feedback, and repeat weak areas.
6 practice prompts across 3 tracks · Diagram canvas · Rule-based validation · Expert solutions
Choose your track
Each track targets a different interview context and skill set.
Frontend System Design
React and Next.js architecture: components, routing, rendering, data fetching, state, accessibility, performance, and real-time UI.
Backend System Design
APIs, service boundaries, database schema, caching, queues, auth, rate limits, monitoring, retries, and scaling.
Full-Stack Architecture
End-to-end product flow: screens, APIs, payments, permissions, admin tools, deployment, failure handling, and cost.
How practice becomes repeatable
The platform automates guidance, checking, scoring, comparison, and repetition. The learner still makes the design decisions.
Choose a track
Frontend, backend, or full-stack. Select difficulty and time.
Get a prompt
The system picks a practice problem based on your weak topics and role.
Design it
Fill requirements, draw a diagram, define APIs, data model, and tradeoffs.
Auto-validate
Platform checks missing components, weak flows, and incomplete sections.
Score and improve
Rubric score, expert solution, and next recommended prompt.
Automation principle
The system does not mark diagrams as simply correct or wrong. It validates whether you covered expected concepts, connections, tradeoffs, and failure cases.
Output: score, missing topics, strengths, expert answer, and next recommended prompt.
TechCookies Pro
- ✓ Full prompt library (all tracks + difficulties)
- ✓ Diagram saving
- ✓ Rule-based automated validation
- ✓ Expert solutions for every prompt
- ✓ Rubric scoring across 5 dimensions
- ✓ Progress tracking and weak area detection
- ✓ Next prompt recommendations