ScaleDojo | Interactive System Design Practice Platform

ScaleDojo is an interactive, hands-on learning platform for system design, software architecture, API design, database schema design, generative AI pipelines, and ML algorithms. Learn by building real distributed architectures, modeling schemas, and designing production-ready APIs with instant AI feedback. 546 challenges across seven labs.

Seven Interactive System Design Labs

HLD Architecture Lab (100 levels): Design distributed cloud architectures on a drag-and-drop canvas. Connect load balancers, CDN nodes, databases, message queues, caches, and workers. Practice URL shortener, rate limiter, notification system, and consistent hashing.
Database Lab — LLD Schema Design (90 missions): Practice database schema modeling on an interactive ER canvas. Define tables, keys, fields, data types, constraints, and relationships. Complete 90 normalized relational missions.
API Design Lab (50 levels): Master REST API design. Craft endpoints, model request/response payloads, specify HTTP status codes, handle nested structures, implement pagination, and error responses.
GenAI Systems Lab (60 challenges): Design production-grade Generative AI pipelines. Architect RAG systems, autonomous AI agents, vector databases, model routers, and guardrails.
AI Lab (72 challenges): Implement real ML algorithms from scratch in Python — gradient descent, k-means, decision trees, PCA, neural networks, and a scalar autograd engine. Autograded instantly, no ML libraries allowed.
SQL Lab (50 cases): Solve SQL mystery investigations — write real queries to uncover bugs, fraud, and anomalies in realistic datasets.
Forge Algorithm Lab (124 challenges): Solve production engineering challenges based on real infrastructure at Uber, Netflix, Stripe, and Discord. Supports Python and Java.

Key Features & Sandbox Tools

Deterministic Scoring Engine: Your designs are evaluated dynamically across multiple core operational metrics: latency, system cost, safety compliance, and functional correctness.
Instant AI Architect Review: Get detailed automated code/diagram reviews, optimization advice, and refactoring suggestions based on industry best practices.
Structured Roadmap & Leaderboards: Follow a curated path from system design fundamentals to advanced topics, earn certificates, and showcase your achievements.

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Challenges

Solve every challenge in an event to earn an exclusive discount coupon.

Challenges

Big Billion Days