Reference Library & Free Roadmaps
Curated 100% free system design interview roadmaps, mock video archives, cloud blueprints, and engineering publications.
| # | Resource & Platform | Category / Type | Description & Key Highlights | Access Tier |
|---|---|---|---|---|
| 01 | Tech Interview Handbook www.interviewhandbook.io/ | Interview Roadmaps Curated Guide | Well-structured, comprehensive roadmap covering system design interview steps, algorithmic patterns, behavioral frameworks, and negotiation rubrics. End-to-end interview playbookSystem design step-by-step checklistCheat sheets for resume & salary | 100% Free & Open Source |
| 02 | Interviewing.io (Free Library) interviewing.io/ | Mock Interviews Video & Transcripts | Extensive library of real mock interview recordings conducted by senior staff engineers from FAANG/MAMAA companies with timestamped feedback and critiques. Uncut FAANG system design mock videosFailure mode analyses & interviewer probingLive technical interview breakdowns | Free Video Library & Guides |
| 03 | NeetCode.io System Design neetcode.io/ | Interview Roadmaps Interactive Roadmaps | Visual system design roadmap with clear beginner-to-advanced architectural foundations, distributed system primitives, and step-by-step diagrams. Structured visual roadmapsDistributed hashing, caching & rate limiting guidesHigh-level architectural problem breakdowns | Free Roadmaps & Videos |
| 04 | LeetCode System Design Community leetcode.com/discuss/interview-question/system-design/ | Mock Interviews Real Experiences | Active global community discussion board where candidates share real-world interview questions, debriefs, whiteboard drawings, and follow-up probing challenges. Recent actual interview questions (Google, Meta, Amazon)Community review of candidate designsEdge-case debriefs & follow-ups | 100% Free Discussion Forum |
| 05 | The System Design Primer (GitHub) github.com/donnemartin/system-design-primer | Architecture Primers 280k+ Stars ⭐ | The definitive open-source GitHub guide for learning how to design large-scale systems and prepare for system design rounds. CAP theorem, PACELC, consistency modelsStep-by-step solutions (URL Shortener, Twitter, Web Crawler)Anki flashcards & scaling calculations | 100% Free Open Source |
| 06 | AWS Well-Architected Framework aws.amazon.com/architecture/well-architected/ | Cloud & Enterprise Official AWS | Architectural best practices and design principles across Reliability, Security, Performance Efficiency, Cost Optimization, and Operational Excellence. Multi-AZ & cross-region disaster recovery patternsResiliency whitepapers & failure mode checklistsEnterprise cloud trade-off matrices | Free Whitepapers & Architecture Center |
| 07 | Google Cloud Architecture Center cloud.google.com/architecture | Cloud & Enterprise Official GCP | Reference architectures, blueprints, and implementation guides for global load balancing, Bigtable, Spanner, and hybrid multi-cloud systems. Global Anycast Network routing patternsSpanner TrueTime & distributed consensusZero-trust BeyondCorp security architectures | Free Architecture Blueprints & Guides |
| 08 | Netflix Technology Blog netflixtechblog.com/ | Engineering Blogs Production Scale | First-hand architectural articles detailing how Netflix scales global video streaming, handles multi-region failovers, and runs Chaos Engineering. Chaos Monkey & fault injection techniquesActive-active multi-region database replicationMicroservice edge gateway & telemetry architecture | 100% Free Technical Publication |
| 09 | Meta / Facebook Engineering Blog engineering.fb.com/ | Engineering Blogs Billions Scale | Deep technical articles detailing the distributed infrastructure, memcached clusters, TAO graph store, and data pipelines powering billions of users. TAO distributed graph data storeScaling Memcached to millions of ops/secReal-time telemetry and streaming infrastructure | 100% Free Engineering Blog |
| 10 | ByteByteGo System Design Newsletter blog.bytebytego.com/ | Architecture Primers Visual Diagrams | Concise visual infographics and newsletter breakdowns simplifying complex system design topics, protocols, and architectural trade-offs. Weekly visual system design infographicsDatabase indexing & replication deep divesAPI protocols comparison (REST vs gRPC vs GraphQL vs WebSocket) | Free Weekly Newsletter & Visuals |
Voice Recording & Proactive Interview Probing Practice
The proven system design interview strategy: eliminate assumptions, record and review your voice, and clear doubts in structured stages.
Record your voice during mock sessions and listen back. Notice verbal fillers, rambling, or rushing through numbers. Clear, calm, paced communication signals staff-level maturity.
Never jump straight into drawing architecture. Ask targeted probing questions to clarify user scale, read/write ratios, latency budgets, payload sizes, and consistency requirements first.
Go in progressive stages: Clarify Scope → Back-of-Envelope Math → High-Level Blocks → Deep Dive → Failure Mitigation. This prevents scope creep and delivers strict alignment.