Changelog

EDA question bank (2026-06-13)

• cheatSheet/EDA_Interview_Question_Bank_Complete.html — 26 EDA interview questions, 78 follow-up answers, 12 SVG diagrams
• 10 categories: delivery semantics, ordering, failure handling, Kafka internals, patterns, backpressure, schema evolution, observability, async vs sync, real-world failures
• Search, category filters, reviewed progress, hard-only / hide-reviewed toggles, keyboard shortcuts
• Linked from cheatSheet/index.html, README, and viewing guides
• GitHub Pages landing HTML: VIEW_ON_GITHUB.html, CHANGELOG.html, github/index.html, github/v15/index.html, github/v10-cards/index.html (generated by scripts/build_pages_landing_html.py)

v15 (2026-06-11)

GitHub view

• cheatSheet/github/ — Markdown per system
• system_design_cheatsheet_v15_github.html — pre-rendered cards (works in GitHub file preview)
• SystemDesign_Complete_v10_github.html — v10 cards pre-rendered
• scripts/build_prerendered_html.py — regenerate *_github.html after content edits
• .github/workflows/pages.yml — GitHub Pages deploy (full JS interactivity when published)
• GitHub cards include flow diagram + ASCII architecture diagram on every system
• cheatSheet/interview-quick-fire.md — standalone quick-fire reference (60+ patterns, expanded from inline 10)

UX

• Visible topbar search (was hidden)
• Theme, collapsed sections, tab memory, and studied checkboxes persist via localStorage
• Deep links: #card-N, #card-N-tab, or #system-slug
• Keyboard: / search, j/k prev/next card, 1–5 tabs (interview mode), Esc close sidebar
• Interview mode toggle — shows 5 essential tabs (Problem, Key points, Tradeoffs, Deep dives, Script)
• Print stylesheet for clean card export
• Prev/Next navigation per card
• Copy-to-clipboard on Script tab
• ARIA labels on tabs and toolbar
• Favicon and meta description
• DB comparison table open by default
• Estimation worksheet in delivery framework

Content

• All 40 cards now have 8 follow-up Q&A entries
• See-also links on overlapping systems (Bitly, WhatsApp, Yelp, YouTube pair, etc.)
• Cloud services quick-ref + copy-paste AWS commands (links to v10 full appendix)
• 4 new systems: Google Maps, Distributed email (Gmail), S3 object storage, Digital wallet (Apple Pay)

Structure

• cheatSheet/index.html landing page
• scripts/validate_systems.py — card completeness checks
• scripts/enrich_v15.py — follow-up enrichment
• scripts/add_systems_v15.py — new system insertion
• Cross-links between v10 and v15 cheatsheets

v14 (prior)

• 36 system cards with 12-tab structure
• Database chooser and quick reference sections
• 8 new systems (notification, autocomplete, snowflake, hotel, leaderboard, kafka, kv store, nearby friends)

v10

• ByteByteGo Vol. 1 & 2 reference + 26 system cards
• AWS/GCP/Azure appendix with CLI commands