Design a Software-Defined Vehicle Feature Store
Last updated: February 21, 2025
Quick Overview
Design a system that manages software-defined vehicle features, enabling over-the-air feature activation, trial periods, and subscription-based feature access.
Rivian
February 21, 20257
3
4,309 solved
Design a system that manages software-defined vehicle features, enabling over-the-air feature activation, trial periods, and subscription-based feature access.
Software-defined vehicles can enable or disable features through software after purchase. This tests your ability to design a feature gating system that works across cloud and edge, handles entitlements, and integrates with billing. It is an increasingly important topic in the EV industry.
What the Interviewer Expects
- Design a feature entitlement system with purchase, subscription, and trial models
- Implement feature flag evaluation on the vehicle that works offline
- Build a feature catalog with dependency management between features
- Handle billing integration for subscription-based features
- Design the feature activation flow from purchase to vehicle-side enablement
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 feature access when the vehicle is offline and a subscription expires?
- How would you implement a free trial that cannot be exploited?
- What happens if a feature depends on hardware the vehicle does not have?
- How do you handle feature entitlement transfer when a vehicle is sold?
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Practice System Design ProblemsSample Answer
Requirements
Functional Requirements
- Feature Entitlement System: Support purchase, trial, and subscription models for vehicle features.
- Feature Flag Evaluation: Implement a mechanism for evaluati...
Capacity Estimation
Assuming Rivian has 100,000 vehicles in the field initially, with an expected increase to 1 million vehicles over the next 5 years:
- Feature Count: Estimate 10 features per vehicle, totaling 10 ...
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