Architect a event-driven Video Streaming Engine
Last updated: July 18, 2025
Quick Overview
Design a event-driven video streaming system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack
July 18, 202544
13
801 solved
Design a event-driven video streaming system that handles millions of requests. Discuss trade-offs in consistency, availability, and performance.
Slack asks this during the System Design Round to assess your architectural thinking. They want to see how you decompose a complex problem, choose appropriate technologies, and reason about failure modes. Strong candidates proactively discuss monitoring, alerting, and operational concerns.
What the Interviewer Expects
- Drive the design discussion proactively with minimal interviewer guidance
- Perform detailed capacity estimation and use it to inform design decisions
- Design for global scale with multi-region deployment and data consistency
- Deep dive into 2-3 critical components with implementation-level detail
- Address complex trade-offs: CAP theorem, eventual consistency, conflict resolution
- Discuss operational excellence: deployment strategy, chaos engineering, SLOs/SLIs
- Propose a phased rollout plan from MVP to full-scale system
Key Topics to Cover
How to Approach This
- Start by clarifying functional and non-functional requirements with the interviewer.
- Estimate the scale: QPS, storage, bandwidth. This drives your design decisions.
- Draw a high-level architecture first, then deep dive into 1-2 critical components.
- Discuss trade-offs explicitly (e.g., consistency vs availability, SQL vs NoSQL).
- Address failure scenarios, monitoring, and how the system handles 10x traffic spikes.
Possible Follow-up Questions
- How would you implement rate limiting to protect the system?
- What would the deployment pipeline look like for this system?
- What happens if one of your database nodes goes down?
- How would you handle a 10x increase in traffic overnight?
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Requirements
- Functional Requirements:
- Users can stream live video content with minimal latency.
- Ability to handle millions of concurrent streams and requests.
- Event-driven architecture to p...
Capacity Estimation
Assuming Slack's user base can reach 100 million:
- If 1% of users are streaming simultaneously, that results in 1 million concurrent streams.
- Each stream generates roughly 1 Mbps of data.
- T...
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