3 h 2 min · 5 lessons
The casebook
Design
33 complete system designs, grouped by the kind of system they build. 20 of them read at three depths: the answer you would say in the interview, the technical deep dive behind it, and a quick review for the night before. Learn the method first, then read cases to see it applied.
33 case studies
to read
Learn the Method
Open the trackThe design framework, the sixty-minute whiteboard routine and the patterns every case reuses. These modules live in AI Systems Design under Learn.
1 h 59 min · 2 lessons
3 h 2 min · 5 lessons
3 h 59 min · 11 lessons
T5.5
Scenario library
31 h 13 min · 33 lessons
Cases by Theme
One line per case; filter by theme, level or reading time. Open a case to choose its depth from the tabs at the top of the page.
Knowledge and Retrieval
4 casesSystems that answer from an organisation’s own documents and data, where the hard part is who may see what, and proving where each answer came from.
Agents and Copilots in Real Workflows
7 casesSystems that work inside real tools — tickets, deploys, CRMs, shipments. Some act on their own within limits; others draft and a person commits. The design is mostly about deciding which is which.
- Customer Support Automation · Case StudyPractise this as a worksheet →
- Tool-Using Agent with Safety Controls · Case StudyPractise this as a worksheet →
- SRE Incident Response AgentPractise this as a worksheet →
- Sales CopilotPractise this as a worksheet →
- Enterprise Coding Assistant
- Real-Time Call Assistant
- Logistics Exception Handling
AI Platforms and Scale
5 casesShared platforms and high-volume services: tenant isolation, batch throughput, consumer-scale chat and the serving layer underneath them.
Delivery, Evaluation, and Operations
3 casesGetting from a scoping document to a system in production, deciding when it is safe to release, and diagnosing it once it is live.
Model Development and Post-Training
1 caseBuilding and adapting the model itself: data, fine-tuning, post-training and evaluation.
Additional System Designs
9 casesComplete designs that do not belong to one of the themes above, from an air-gapped deployment to a gateway in front of every model call.
- AI-Powered Recruiting Platform
- Travel Agent: the 12-Part Framework Worked Through
- AI System for an Air-Gapped Environment · Case StudyPractise this as a worksheet →
- Reliable Workflow Orchestration System · Case StudyPractise this as a worksheet →
- Configurable Platform for Customer-Specific Workflows · Case StudyPractise this as a worksheet →
- Enterprise Chatbot Platform · Case StudyPractise this as a worksheet →
- Agent That Adapts to New Tasks
- Personal Assistant That Remembers You
- Production LLM Gateway
Product Judgement and Problem Decomposition
4 casesQuestions that test how you think rather than what you draw: which use cases to fund, how to scale a prototype, what to do with poor data, and how to break an open-ended problem down in sixty minutes.