Twilio
Senior
Build Twilio's SMS connectivity layer — a Java distributed platform optimized for delivery
This role sits on Twilio SMS Engineering, working on the SMS connectivity/delivery layer as a distributed Java platform running on cloud infrastructure. Interview prep for backend engineers ready to talk availability, throughput, latency, and data integrity in a real messaging system, plus on-call ownership.
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What this interview tests
- Distributed systems for delivery (availability, throughput, latency, data integrity)
- Java backend frameworks (Dropwizard, Spring, Hibernate)
- Cloud infrastructure operations (AWS/GCP/Azure)
- Testing discipline (unit, integration, load)
- On-call ownership and incident troubleshooting
Common question themes
Design a high-throughput, low-latency message delivery system
Debugging a production issue you owned independently end to end
CS fundamentals: data structures, algorithms, distributed systems
How you write load tests for a distributed platform
Experience with microservices, Docker, and Kubernetes
Working through code review and cross-functional feature delivery
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