Design an OTA Update System for Connected Vehicles
Last updated: February 21, 2025
Quick Overview
Design an over-the-air software update system that can safely deliver firmware and software updates to millions of vehicles in the field.
Rivian
February 21, 202512
4
4,170 solved
Design an over-the-air software update system that can safely deliver firmware and software updates to millions of vehicles in the field.
This is the most commonly reported Rivian system design question. OTA updates are mission-critical at Rivian since every vehicle runs software that must be updated without dealer visits. The interviewer expects you to address safety, rollback, and intermittent connectivity.
What the Interviewer Expects
- Design a staged rollout pipeline with canary deployments to vehicle cohorts
- Implement A/B partition schemes so failed updates can roll back without bricking the vehicle
- Handle intermittent connectivity with resumable differential downloads
- Address safety constraints including ensuring updates never apply while driving
- Discuss update verification, code signing, and tamper-proof delivery
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 handle an update that passes canary but causes issues at scale?
- What happens if a vehicle loses connectivity mid-update?
- How do you prioritize security patches over feature updates?
- How would you design the system to support the VW-Rivian joint venture vehicles?
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Practice System Design ProblemsSample Answer
Requirements
Functional Requirements
- Firmware Update Delivery: The system must deliver software updates to vehicles over-the-air without the need for dealer visits.
- Staged Rollout: Implement a ca...
Capacity Estimation
Assume Rivian has approximately 500,000 vehicles in the field, with a growth rate of 20% per year. Given that each vehicle might receive updates 4 times a year, we can estimate the capacit...
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