System Design Roadmap | ScaleDojo

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.

Foundation0/7

Intermediate0/6

Advanced0/6

Expert0/4

100HLD

80LLD

50API

50SQL

Origin Files

Foundation

Networking & Web Basics

Foundation

12

Databases & Storage

Foundation

27150

API Design Fundamentals

Foundation

19

Caching Strategies

Foundation

31

Load Balancing & Scaling

Foundation

21

Authentication & Security

Foundation

233

Message Queues & Events

Intermediate

324

Database Scaling & Replication

Intermediate

34

Advanced API Patterns

Intermediate

10

Microservices Architecture

Intermediate

313

Consistency & Distributed Data

Intermediate

23

GraphQL & gRPC Deep Dive

Intermediate

16

Real-Time & Streaming Systems

Advanced

713

System Design Patterns

Advanced

454

Observability & Monitoring

Advanced

312

Search, Feeds & Recommendations

Advanced

911

Storage & CDN Deep Dive

Advanced

411

FinTech & Payment Systems

Advanced

471

Interview Classics

Expert

1082

Advanced System Design

Expert

14107

Planet-Scale Systems

Expert

47401

The Architect Mindset

Expert

221

Click any node to explore topics and start practicing