Real-World System Design Roadmap
Domain-by-domain case studies from social media to Gen AI-powered systems
Your Journey at a Glance
💡 How to use this roadmap
Work through each phase in order. Click on a skill to expand it — you'll find a description and curated resources. Don't rush; understanding beats speed. Complete one phase before moving to the next.
Social Media & Communication
Systems that connect billions of people. Master feed generation, ranking algorithms, real-time messaging, and the viral growth patterns that define social platforms.
Video & Media Streaming
Systems that deliver entertainment at planetary scale. Master video processing, adaptive bitrate streaming, CDN architecture, and content recommendation engines.
Transportation & Logistics
Systems that move people and packages through the physical world. Master real-time location tracking, dispatch algorithms, ETA prediction, and supply chain optimization.
E-Commerce
Systems that power online retail at massive scale. Master product catalogs, shopping carts, checkout flows, inventory management, and multi-tenant commerce platforms.
Payments
Systems where correctness is non-negotiable. Master payment processing, fraud detection, digital wallets, and the reliability guarantees that financial systems demand.
EdTech
Systems that power learning at scale. Master content delivery, coding evaluation, adaptive learning paths, and the engagement mechanics that keep students progressing.
Online Collaboration Tools
Systems where multiple people work together in real time. Master conflict-free data structures, real-time sync, presence management, and the UX engineering behind seamless collaboration.
Search & Data Infrastructure
The systems that power data discovery and analytics at scale. Master inverted indexes, event ingestion pipelines, time series storage, and the query engines behind modern analytics.
Developer Tools & Infrastructure
The systems that developers build on. Master CI/CD orchestration, distributed rate limiting, feature flag platforms, and the reliability guarantees that developer tools demand.
Gen AI-Powered Systems
Systems where AI is the product. Master the architecture behind AI search, coding assistants, conversational agents, RAG platforms, and the safety infrastructure that keeps AI systems trustworthy.
Meta — Architecture Decisions
The skills that separate good architects from great ones. Master trade-off analysis, capacity planning, cost estimation, and the communication skills needed to drive architectural decisions.
Roadmap Complete!
You now have the foundations of a production-ready Java engineer. Apply by building real projects.
Design & Present a Complete System Architecture
Choose any domain from this roadmap (or propose your own). Produce a complete architecture document: requirements (functional + non-functional), capacity estimates, component diagrams, data models, API contracts, failure mode analysis, cost estimation, and a presentation-ready architecture decision record.
What you'll build
- Requirements specification with measurable SLOs
- Capacity planning: traffic, storage, compute, network estimates
- Component architecture diagram with data flow
- Data model design (schemas, partitioning strategy, indexes)
- API contract design (endpoints, request/response, error handling)
- Failure mode analysis (what breaks and how the system recovers)
- Cost estimation with cloud pricing breakdown
- Architecture Decision Record documenting key trade-offs
Tech stack
Key highlights
- ✦Demonstrates mastery across all 11 domains covered in this roadmap
- ✦Produces a portfolio-worthy architecture document
- ✦Prepares for real-world system design interviews and senior engineering roles