Design an AI Code Assistant

Design an AI-powered code assistant like GitHub Copilot that provides intelligent code completions, explanations, and refactoring suggestions.

Functional Requirements

• Real-time code completions as users type
• Multi-line code suggestions
• Code explanation and documentation generation
• Refactoring suggestions
• Support multiple programming languages
• Context-aware suggestions based on project files

Non-Functional Requirements

• Sub-200ms latency for completions
• Support 100K+ concurrent developers
• Handle codebases with 1M+ files
• Maintain suggestion acceptance rate above 30%
• Respect code privacy and security

Questions to Consider

• How do you balance latency vs suggestion quality?
• How do you gather relevant context from large codebases?
• How do you handle sensitive/proprietary code?