# Changelog Track all the latest content additions and updates to Hello Interview. We continuously add new system design breakdowns, deep dives, and learning materials. ## September 7 - 13, 2026 ### 5 updates **New Content** - [Anthropic Software Engineer Interview Guide (2026)](/content/guides/anthropic/swe/index.html) Sep 7, 2026 by Evan King | Content - [Anthropic Senior Software Engineer Interview Guide (2026)](/content/guides/anthropic/senior/index.html) Sep 7, 2026 by Evan King | Content - [Anthropic Staff Software Engineer Interview Guide (2026)](/content/guides/anthropic/staff/index.html) Sep 7, 2026 by Evan King | Content **Updated Content** - [OpenAI L4 Interview Guides & Questions (2026)](/content/guides/openai/l4/index.html) Sep 7, 2026 | Content - [OpenAI L5 Interview Guides & Questions (2026)](/content/guides/openai/l5/index.html) Sep 7, 2026 | Content ## August 31 - September 6, 2026 ### 2 updates **New Content** - [Design a Flash Sale System](/content/learn/system-design/problem-breakdowns/flash-sale/index.html) Premium Sep 4, 2026 by Evan King | System Design **New Videos** - [Handling Large Blobs Pattern for System Design Interviews](/content/learn/system-design/patterns/large-blobs/index.html) Premium Sep 4, 2026 by Evan King | System Design ## August 17 - 23, 2026 ### 2 updates **New Content** - [Change Data Capture in System Design Interviews](/content/learn/system-design/deep-dives/change-data-capture/index.html) Premium Aug 17, 2026 by Evan King | Deep Dive **New Videos** - [Design ChatGPT](/content/learn/system-design/problem-breakdowns/chatgpt/index.html) Premium Aug 22, 2026 by Evan King | System Design ## August 10 - 16, 2026 ### 1 update **New Videos** - [Dealing with Contention Pattern for System Design Interviews](/content/learn/system-design/patterns/dealing-with-contention/index.html) Premium Aug 10, 2026 by Evan King | System Design ## July 27 - August 2, 2026 ### 3 updates **New Content** - [Design a Notification System](/content/learn/system-design/problem-breakdowns/notification-system/index.html) Premium Jul 28, 2026 by Evan King | System Design - [How Figma Built Multiplayer Editing on Simplified CRDTs](/content/learn/system-design/in-the-wild/figma-multiplayer/index.html) Jul 28, 2026 by Evan King | In the Wild - [How Spotify Serves Point Queries from an Exabyte Data Lake](/content/learn/system-design/in-the-wild/spotify-data-lake-point-queries/index.html) Jul 28, 2026 by Stefan Mai | In the Wild ## July 13 - 19, 2026 ### 4 updates **New Content** - [How Slack Put Kafka in Front of Its Redis Job Queue](/content/learn/system-design/in-the-wild/slack-job-queue/index.html) Jul 17, 2026 by Evan King | In the Wild - [How Discord Moved Trillions of Messages to ScyllaDB](/content/learn/system-design/in-the-wild/discord-messages-scylladb/index.html) Jul 16, 2026 by Evan King | In the Wild - [Answering AI Questions](/content/learn/behavioral/course/answering-ai-questions/index.html) Premium Jul 16, 2026 by Austen McDonald | Behavioral - [How Shopify Moved Inventory Reservations from Redis to MySQL](/content/learn/system-design/in-the-wild/shopify-inventory-reservations/index.html) Jul 14, 2026 by Evan King | In the Wild ## July 6 - 12, 2026 ### 1 update **New Videos** - [Multi-step Processes Pattern for System Design Interviews](/content/learn/system-design/patterns/multi-step-processes/index.html) Premium Jul 10, 2026 by Stefan Mai | System Design ## June 29 - July 5, 2026 ### 1 update **New Content** - [Design an Online Chess Platform](/content/learn/system-design/problem-breakdowns/online-chess/index.html) Premium Jun 29, 2026 by Evan King | System Design ## June 22 - 28, 2026 ### 1 update **New Content** - [Proximity Search in System Design Interviews](/content/learn/system-design/deep-dives/proximity-search/index.html) Jun 23, 2026 by Evan King | Deep Dive ## June 15 - 21, 2026 ### 1 update **New Videos** - [How to scale writes in your system design interview](/content/learn/system-design/patterns/scaling-writes/index.html) Premium Jun 17, 2026 by Stefan Mai | System Design ## June 8 - 14, 2026 ### 2 updates **Updated Content** - [Multi-step Processes Pattern for System Design Interviews](/content/learn/system-design/patterns/multi-step-processes/index.html) Premium Saga pattern and durable execution mechanics overhaul, simplified tooling guidance, and clarity edits based on reader feedback. Jun 11, 2026 by Stefan Mai | System Design - [Redis Deep Dive for System Design Interviews](/content/learn/system-design/deep-dives/redis/index.html) Edits for clarity and correctness, distributed locks overhaul, and expanded sections based on reader feedback. Jun 11, 2026 by Stefan Mai | Deep Dive ## June 1 - 7, 2026 ### 1 update **Updated Content** - [Dealing with Contention Pattern for System Design Interviews](/content/learn/system-design/patterns/dealing-with-contention/index.html) Premium Rewrote the pattern around closing the read-modify-write gap, walking up from conditional writes through pessimistic locking, optimistic concurrency, SERIALIZABLE isolation (now covering write skew), and distributed locks as out-of-database leases for reservations. Moved distributed transactions (2PC and sagas) out to the Multi-step Processes pattern so this one stays focused on coordinating access to a single source of truth. Jun 5, 2026 by Evan King | System Design ## May 25 - 31, 2026 ### 5 updates **New Videos** - [Graphs Overview](/content/learn/code/depth-first-search/graphs-overview/index.html) May 25, 2026 by Shivam Chauhan | Content - [Graphs Overview](/content/learn/code/breadth-first-search/graphs-overview/index.html) May 25, 2026 by Shivam Chauhan | Content - [Can Attend Meetings](/content/learn/code/intervals/can-attend-meetings/index.html) May 25, 2026 by Shivam Chauhan | Content - [Kth Largest Element in an Array](/content/learn/code/heap/kth-largest-element-in-an-array/index.html) May 25, 2026 by Shivam Chauhan | Content - [Course Schedule II](/content/learn/code/graphs/course-schedule-ii/index.html) May 25, 2026 by Shivam Chauhan | Content ## May 18 - 24, 2026 ### 11 updates **New Content** - [Design ChatGPT](/content/learn/system-design/problem-breakdowns/chatgpt/index.html) Premium May 21, 2026 by Evan King | System Design - [Common Patterns in AI Coding Interviews](/content/learn/ai-coding/overview/patterns/index.html) May 21, 2026 by Stefan Mai | Content - [Graph Search & Pathfinding in AI Coding Interviews](/content/learn/ai-coding/patterns/graph-search/index.html) Premium May 21, 2026 by Stefan Mai | Content - [Topological Sort & Dependency Resolution in AI Coding Interviews](/content/learn/ai-coding/patterns/topological-sort/index.html) Premium May 21, 2026 by Stefan Mai | Content - [Backtracking & Constraint Satisfaction in AI Coding Interviews](/content/learn/ai-coding/patterns/backtracking/index.html) Premium May 21, 2026 by Stefan Mai | Content - [Greedy Algorithms & Bin Packing in AI Coding Interviews](/content/learn/ai-coding/patterns/greedy-algorithms/index.html) Premium May 21, 2026 by Stefan Mai | Content - [Dynamic Programming in AI Coding Interviews](/content/learn/ai-coding/patterns/dynamic-programming/index.html) Premium May 21, 2026 by Shivam Chauhan | Content - [String Matching & Parsing in AI Coding Interviews](/content/learn/ai-coding/patterns/string-matching/index.html) Premium May 21, 2026 by Stefan Mai | Content - [Data Structure Design in AI Coding Interviews](/content/learn/ai-coding/patterns/data-structure-design/index.html) Premium May 21, 2026 by Stefan Mai | Content **New Videos** - [Solution Space Trees](/content/learn/code/backtracking/solution-space-trees/index.html) May 24, 2026 by Shivam Chauhan | Content - [Remove Nth Node From End of List](/content/learn/code/linked-list/remove-nth-node-from-end-of-list/index.html) May 21, 2026 by Shivam Chauhan | Content ## May 11 - 17, 2026 ### 10 updates **New Content** - [Feature Engineering](/content/learn/ml-system-design/core-concepts/feature-engineering/index.html) May 14, 2026 by Stefan Mai | ML System Design **New Videos** - [Maximum Depth of Binary Tree](/content/learn/code/depth-first-search/maximum-depth-of-binary-tree/index.html) May 15, 2026 by Shivam Chauhan | Content - [Course Schedule](/content/learn/code/graphs/course-schedule/index.html) May 15, 2026 by Shivam Chauhan | Content - [Return Values](/content/learn/code/depth-first-search/return-values/index.html) May 14, 2026 by Shivam Chauhan | Content - [Merge Intervals](/content/learn/code/intervals/merge-intervals/index.html) May 14, 2026 by Shivam Chauhan | Content - [Path Sum](/content/learn/code/depth-first-search/path-sum/index.html) May 13, 2026 by Shivam Chauhan | Content - [Diameter of a Binary Tree](/content/learn/code/depth-first-search/diameter-of-a-binary-tree/index.html) May 13, 2026 by Shivam Chauhan | Content - [Linked List Cycle](/content/learn/code/linked-list/linked-list-cycle/index.html) May 12, 2026 by Shivam Chauhan | Content - [Unique Paths](/content/learn/code/dynamic-programming/unique-paths/index.html) May 12, 2026 by Shivam Chauhan | Content - [Monotonic Stack](/content/learn/code/stack/monotonic-stack/index.html) May 11, 2026 by Shivam Chauhan | Content --- We're constantly adding new content to help you ace your interviews. Check back regularly for the latest system design breakdowns, deep dives, and interview preparation materials.