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Concept guides
AI-assisted engineering
System design
Coding
Builds on
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Working with an assistant
Specs and prompts
Verifying AI output
Agent design
Reviewing AI code
Agent evaluation
Guardrails
Rolling out agents
Refactors and migrations
Judgment and tool fit
Data modeling and storage
Media and uploads
Scale and caching
Messaging and streams
Security and privacy
Search and feeds
Pipelines and analytics
Reliability and failover
Consistency and money
Real-time systems
ML systems
AI in the system
Arrays and strings
Bits and math
SQL
Data and ML code
Front-end code
Secure coding
Searching and sorting
Designing data structures
Backtracking and games
Correctness review
Performance review
Error handling
Security review
Graphs and trees
Concurrency
Backend internals
Dynamic programming
Observability
Capacity and traffic
Dependencies and deploys
Databases in production
Incident response
AI-assisted engineering
Foundations
Working with an assistant
Foundations
Specs and prompts
Core
Verifying AI output
Core
Agent design
Applied
Reviewing AI code
Applied
Agent evaluation
Applied
Guardrails
Advanced
Rolling out agents
Advanced
Refactors and migrations
Advanced
Judgment and tool fit
System design
Foundations
Data modeling and storage
Level 2
Media and uploads
Level 2
Scale and caching
Level 2
Messaging and streams
Level 2
Security and privacy
Level 3
Search and feeds
Level 3
Pipelines and analytics
Level 3
Reliability and failover
Level 3
Consistency and money
Level 3
Real-time systems
Level 4
ML systems
Level 5
AI in the system
Coding
Foundations
Arrays and strings
Foundations
Bits and math
Foundations
SQL
Level 2
Data and ML code
Level 2
Front-end code
Level 2
Secure coding
Level 2
Searching and sorting
Level 2
Designing data structures
Level 2
Backtracking and games
Level 2
Correctness review
Level 3
Performance review
Level 3
Error handling
Level 3
Security review
Level 3
Graphs and trees
Level 3
Concurrency
Level 4
Backend internals
Level 4
Dynamic programming
Level 5
Observability
Level 6
Capacity and traffic
Level 6
Dependencies and deploys
Level 6
Databases in production
Level 7
Incident response
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