Twilio
Senior
Scale Twilio SendGrid's email platform that processed 12 billion emails on Black Friday
Twilio is hiring a Staff-level engineer for its SendGrid email platform to redesign backend services for scale, harden security, and improve customer-facing email health insights. Expect deep questions on distributed systems ownership at extreme scale, technical leadership across teams, and operational rigor around monitoring, alerting, and resilience.
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What this interview tests
- Highly available, fault-tolerant distributed systems at very large scale
- Technical leadership: driving decisions across teams and functional domains
- Operational excellence: monitoring, alerting, long-term maintainability
- Service ownership end-to-end in production
- Balancing tech debt against feature delivery
- Communicating technical vision to technical and non-technical audiences
Common question themes
Tell me about a highly available distributed system you built and what happened when it hit scale limits
Describe a time you led a technical decision that other teams had to adopt, and how you handled resistance
How do you decide what to instrument and alert on for a service processing billions of events
Tell me about balancing tech debt against a feature deadline and how you made and communicated that call
How would you approach improving security posture for a system facing evolving threats
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