<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xhtml="http://www.w3.org/1999/xhtml"><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Complexity-Cheatsheet</loc>
    <lastmod>2026-05-02T09:02:34.000Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/MOC-DSA-Mastery</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Binary-Search-on-Answer</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Binary-Search</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Bit-Tricks</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Divide-and-Conquer</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Prefix-Sum</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Recursion-DC</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Sliding-Window</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Sort-Then-Search</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Stack-Queue</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Pattern-Two-Sum-Variants</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/00-Master-Maps/Roadmap-FAANG</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/01-Complexity-and-Array</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/02-Linked-List-Dummy-Node</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/03-Stack-and-Queue</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/04-Recursion-and-Backtracking</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/05-Binary-Search</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/06-Sorting-Merge-Quick</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/07-Hash-Table</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/08-Tree-DFS-BFS</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/09-Graph-DFS-BFS</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/10-Heap</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/11-Practice-Big-Tech-1</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/01-Big-Tech-Foundation/12-Practice-Big-Tech-2</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/01-Two-Pointers-Sliding-Window</loc>
    <lastmod>2026-05-02T09:02:34.001Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/02-Bit-Manipulation</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/03-Monotonic-Stack-Queue</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/04-Advanced-Binary-Search</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/05-Divide-and-Conquer</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/06-String-Matching-Trie</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/07-Union-Find</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/08-Weighted-Graphs</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/09-Dynamic-Programming</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/10-Advanced-DP</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/11-Segment-Tree</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/12-Practice-FAANG-1</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/13-Practice-FAANG-2</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/14-Greedy</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/02-FAANG-Mastery/15-Intervals</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/DSA-Mastery/03-LeetCode-Journal/_Template-Problem</loc>
    <lastmod>2026-05-02T09:02:34.003Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/00-Maps/MOC-System-Design</loc>
    <lastmod>2026-05-02T09:02:34.005Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/00-Maps/References</loc>
    <lastmod>2026-05-02T09:02:34.005Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/00-Maps/Roadmap</loc>
    <lastmod>2026-05-02T09:02:34.005Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/01-Fundamentals/Tuan-01-Scale-From-Zero-To-Millions</loc>
    <lastmod>2026-05-02T09:02:34.005Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/01-Fundamentals/Tuan-02-Back-of-the-envelope</loc>
    <lastmod>2026-05-02T09:02:34.006Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/01-Fundamentals/Tuan-03-Networking-DNS-CDN</loc>
    <lastmod>2026-05-02T09:02:34.006Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/01-Fundamentals/Tuan-04-API-Design-REST-gRPC</loc>
    <lastmod>2026-05-02T09:02:34.006Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-05-Load-Balancer</loc>
    <lastmod>2026-05-02T09:02:34.006Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-06-Cache-Strategy</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-07-Database-Sharding-Replication</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-08-Message-Queue</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-09-Rate-Limiter</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-10-Consistent-Hashing</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-CRDTs-Conflict-Free-Data-Types</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-Consensus-Raft-Paxos</loc>
    <lastmod>2026-05-02T09:02:34.007Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-Consistency-Models-Isolation</loc>
    <lastmod>2026-05-02T09:02:34.008Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-Edge-Wasm-Architecture</loc>
    <lastmod>2026-05-02T09:02:34.008Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-LLM-Serving-Infrastructure</loc>
    <lastmod>2026-05-02T09:02:34.008Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-MCP-Architecture</loc>
    <lastmod>2026-05-02T09:02:34.008Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/02-Components/Tuan-Bonus-Multi-Region-Active-Active-DSQL</loc>
    <lastmod>2026-05-02T09:02:34.008Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-11-Microservices-Pattern</loc>
    <lastmod>2026-05-02T09:02:34.009Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-12-CICD-Pipeline</loc>
    <lastmod>2026-05-02T09:02:34.009Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-13-Monitoring-Observability</loc>
    <lastmod>2026-05-02T09:02:34.010Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-14-AuthN-AuthZ-Security</loc>
    <lastmod>2026-05-02T09:02:34.010Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-15-Data-Security-Encryption</loc>
    <lastmod>2026-05-02T09:02:34.010Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-Bonus-FinOps-Cloud-Unit-Economics</loc>
    <lastmod>2026-05-02T09:02:34.010Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-Bonus-Multi-Tenancy-SaaS-Patterns</loc>
    <lastmod>2026-05-02T09:02:34.011Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-Bonus-Outbox-Pattern</loc>
    <lastmod>2026-05-02T09:02:34.011Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-Bonus-Platform-Engineering-IDP</loc>
    <lastmod>2026-05-02T09:02:34.011Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/03-Architecture-DevOps-Security/Tuan-Bonus-Progressive-Delivery</loc>
    <lastmod>2026-05-02T09:02:34.011Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Ad-Click-Event-Aggregation</loc>
    <lastmod>2026-05-02T09:02:34.012Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Digital-Wallet</loc>
    <lastmod>2026-05-02T09:02:34.012Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Distributed-Email-Service</loc>
    <lastmod>2026-05-02T09:02:34.012Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Distributed-Message-Queue</loc>
    <lastmod>2026-05-02T09:02:34.012Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Gaming-Leaderboard</loc>
    <lastmod>2026-05-02T09:02:34.013Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Google-Drive</loc>
    <lastmod>2026-05-02T09:02:34.013Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Google-Maps</loc>
    <lastmod>2026-05-02T09:02:34.013Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Hotel-Reservation-System</loc>
    <lastmod>2026-05-02T09:02:34.014Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Metrics-Monitoring-Alerting</loc>
    <lastmod>2026-05-02T09:02:34.014Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Modern-Data-Lakehouse</loc>
    <lastmod>2026-05-02T09:02:34.014Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Nearby-Friends</loc>
    <lastmod>2026-05-02T09:02:34.014Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Payment-System</loc>
    <lastmod>2026-05-02T09:02:34.015Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Proximity-Service</loc>
    <lastmod>2026-05-02T09:02:34.015Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-S3-Object-Storage</loc>
    <lastmod>2026-05-02T09:02:34.015Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Search-Autocomplete</loc>
    <lastmod>2026-05-02T09:02:34.016Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Stock-Exchange</loc>
    <lastmod>2026-05-02T09:02:34.016Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Unique-ID-Generator</loc>
    <lastmod>2026-05-02T09:02:34.016Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-Web-Crawler</loc>
    <lastmod>2026-05-02T09:02:34.016Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Case-Design-YouTube-Video-Streaming</loc>
    <lastmod>2026-05-02T09:02:34.017Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Tuan-16-Design-URL-Shortener</loc>
    <lastmod>2026-05-02T09:02:34.017Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Tuan-17-Design-Chat-System</loc>
    <lastmod>2026-05-02T09:02:34.017Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Tuan-18-Design-News-Feed</loc>
    <lastmod>2026-05-02T09:02:34.017Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Tuan-19-Design-Notification-System</loc>
    <lastmod>2026-05-02T09:02:34.018Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/04-Case-Studies/Tuan-20-Design-Key-Value-Store</loc>
    <lastmod>2026-05-02T09:02:34.018Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/05-Attachments/mermaid-templates</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/06-CS-Foundations/Tuan-Foundations-Compilers-VMs</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/06-CS-Foundations/Tuan-Foundations-Computer-Architecture</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/06-CS-Foundations/Tuan-Foundations-Database-Internals</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/06-CS-Foundations/Tuan-Foundations-Math-for-Architects</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/System-Design-Mastery/06-CS-Foundations/Tuan-Foundations-OS-Essentials</loc>
    <lastmod>2026-05-02T09:02:34.020Z</lastmod>
  </url><url>
    <loc>https://obsi.lthieu.dev/</loc>
    <lastmod>2026-05-02T09:02:53.740Z</lastmod>
  </url></urlset>