I started with container provisioning per user which felt like the obvious entry point, but the interviewer kept pulling the thread on things I glossed over.
Start by clarifying requirements and scale, then sketch a high-level architecture with core components (workspace orchestration, editor, terminal, sandboxed runtime). Dive into key design decisions like isolation, persistence, and real-time collaboration, and discuss trade-offs and failure modes.
Pro tip: Emphasize security and resource efficiency: use microVMs or containers with strict resource limits, and design for graceful degradation and recovery. Also, discuss how you would handle state synchronization and latency for a responsive user experience.
Ask about expected number of concurrent users, workspace persistence, supported languages, collaboration features, and security/compliance needs. This sets the scope and guides design choices.
Outline the main components: a frontend (editor, terminal UI), a backend API for workspace management, a scheduler/orchestrator, and a pool of sandboxed runtimes. Describe how they interact.
Discuss the editor (e.g., Monaco), terminal (e.g., xterm.js with WebSocket), and sandboxed runtime (e.g., containers, microVMs, or gVisor). Explain how to achieve low-latency communication and file synchronization.
Explain how to scale horizontally, handle failures (e.g., workspace recovery), and secure the environment (network isolation, resource quotas, authentication/authorization).
Compare design choices: containers vs. VMs, persistent vs. ephemeral workspaces, self-hosted vs. cloud-managed. Justify your decisions based on requirements.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.