What's New
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)
Sep 7, 2026 by Evan King | Content - Anthropic Senior Software Engineer Interview Guide (2026)
Sep 7, 2026 by Evan King | Content - Anthropic Staff Software Engineer Interview Guide (2026)
Sep 7, 2026 by Evan King | Content
Updated Content - OpenAI L4 Interview Guides & Questions (2026)
Sep 7, 2026 | Content - OpenAI L5 Interview Guides & Questions (2026)
Sep 7, 2026 | Content
August 31 - September 6, 2026
2 updates
New Content
- Design a Flash Sale System
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Sep 4, 2026 by Evan King | System Design
New Videos - Handling Large Blobs Pattern for System Design Interviews
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Sep 4, 2026 by Evan King | System Design
August 17 - 23, 2026
2 updates
New Content
- Change Data Capture in System Design Interviews
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Aug 17, 2026 by Evan King | Deep Dive
New Videos - Design ChatGPT
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Aug 22, 2026 by Evan King | System Design
August 10 - 16, 2026
1 update
New Videos
- Dealing with Contention Pattern for System Design Interviews
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Aug 10, 2026 by Evan King | System Design
July 27 - August 2, 2026
3 updates
New Content
- Design a Notification System
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Jul 28, 2026 by Evan King | System Design - How Figma Built Multiplayer Editing on Simplified CRDTs
Jul 28, 2026 by Evan King | In the Wild - How Spotify Serves Point Queries from an Exabyte Data Lake
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
Jul 17, 2026 by Evan King | In the Wild - How Discord Moved Trillions of Messages to ScyllaDB
Jul 16, 2026 by Evan King | In the Wild - Answering AI Questions
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Jul 16, 2026 by Austen McDonald | Behavioral - How Shopify Moved Inventory Reservations from Redis to MySQL
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
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Jul 10, 2026 by Stefan Mai | System Design
June 29 - July 5, 2026
1 update
New Content
- Design an Online Chess Platform
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Jun 29, 2026 by Evan King | System Design
June 22 - 28, 2026
1 update
New Content
- Proximity Search in System Design Interviews
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
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Jun 17, 2026 by Stefan Mai | System Design
June 8 - 14, 2026
2 updates
Updated Content
- Multi-step Processes Pattern for System Design Interviews
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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
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
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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
May 25, 2026 by Shivam Chauhan | Content - Graphs Overview
May 25, 2026 by Shivam Chauhan | Content - Can Attend Meetings
May 25, 2026 by Shivam Chauhan | Content - Kth Largest Element in an Array
May 25, 2026 by Shivam Chauhan | Content - Course Schedule II
May 25, 2026 by Shivam Chauhan | Content
May 18 - 24, 2026
11 updates
New Content
- Design ChatGPT
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May 21, 2026 by Evan King | System Design - Common Patterns in AI Coding Interviews
May 21, 2026 by Stefan Mai | Content - Graph Search & Pathfinding in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content - Topological Sort & Dependency Resolution in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content - Backtracking & Constraint Satisfaction in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content - Greedy Algorithms & Bin Packing in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content - Dynamic Programming in AI Coding Interviews
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May 21, 2026 by Shivam Chauhan | Content - String Matching & Parsing in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content - Data Structure Design in AI Coding Interviews
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May 21, 2026 by Stefan Mai | Content
New Videos - Solution Space Trees
May 24, 2026 by Shivam Chauhan | Content - Remove Nth Node From End of List
May 21, 2026 by Shivam Chauhan | Content
May 11 - 17, 2026
10 updates
New Content
- Feature Engineering
May 14, 2026 by Stefan Mai | ML System Design
New Videos - Maximum Depth of Binary Tree
May 15, 2026 by Shivam Chauhan | Content - Course Schedule
May 15, 2026 by Shivam Chauhan | Content - Return Values
May 14, 2026 by Shivam Chauhan | Content - Merge Intervals
May 14, 2026 by Shivam Chauhan | Content - Path Sum
May 13, 2026 by Shivam Chauhan | Content - Diameter of a Binary Tree
May 13, 2026 by Shivam Chauhan | Content - Linked List Cycle
May 12, 2026 by Shivam Chauhan | Content - Unique Paths
May 12, 2026 by Shivam Chauhan | Content - Monotonic Stack
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.