Design a Charging Station Network and Availability System
Last updated: February 21, 2025
Quick Overview
Design a system that tracks real-time availability of charging stations, handles reservations, estimates wait times, and routes vehicles to optimal chargers.
Rivian
February 21, 20258
7
4,797 solved
Design a system that tracks real-time availability of charging stations, handles reservations, estimates wait times, and routes vehicles to optimal chargers.
Charging infrastructure is critical to the EV ownership experience. Rivian operates the Rivian Adventure Network and also integrates with third-party charging networks. This question tests your ability to design a geospatial system with real-time state management.
What the Interviewer Expects
- Design real-time station status tracking with heartbeat-based health monitoring
- Implement a reservation system that handles no-shows and dynamic pricing
- Build intelligent routing that considers battery level, charger availability, and wait times
- Handle integration with third-party charging networks with varying data freshness
- Design for the geospatial query patterns needed for nearest-charger search
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 do you handle a charger that reports available but is actually broken?
- What happens when a reserved charger becomes unavailable?
- How would you predict wait times during peak travel periods?
- How do you balance Rivian Adventure Network chargers with third-party availability?
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Practice System Design ProblemsSample Answer
Requirements
Functional Requirements:
- Real-Time Availability Tracking: The system must track the availability of charging stations in real-time, updating every few seconds to reflect current status.
- ...
Capacity Estimation
Assuming Rivian has 10,000 charging stations across the US and anticipates an average of 5 reservations per station per hour:
- Total Reservations/Hour: 10,000 stations * 5 reservations = 50,000 r...
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