Staff Software Engineer (L4)

At Twilio, we're shaping the future of communications, all from the comfort of our homes. We deliver innovative solutions to hundreds of thousands of businesses and empower millions of developers worldwide to craft personalized customer experiences.

As a Staff Site Reliability Engineer, you will join our Platform Engineering organization and own the reliability posture of significant parts of our production estate. Your impact will be felt across multiple teams rather than within one.

Responsibilities:

• Own the reliability posture of production services in your area , availability, latency, capacity, efficiency, performance, and the monitoring and alerting that makes them visible
• Define, instrument, and operate against SLIs and SLOs, and use error budgets to drive engineering priorities
• Identify trends and problem areas that threaten stability, and provide a path forward to mitigate risk before it reaches customers
• Drive down repair items and prevent classes of incidents rather than resolving them one at a time
• Improve detection, response, and recovery , reducing time to acknowledge, engage, mitigate, and restore, with fewer people pulled in
• Design for failure: strengthen failure domains, validate recovery paths, and make production changes safer to ship and safer to roll back
• Participate in on-call for the services you support, and lead the response when production is degraded
• Write post-mortems that identify true root causes, and drive the follow-up work to completion
• Oversee efforts to identify, diagnose, report, and document production problems across all reliability dimensions
• Write, configure, and deploy code that measurably improves service reliability , maintainable, reviewed, documented, and well tested
• Orchestrate complex changes across systems and services, documenting design changes, technical decisions, migration plans, and upgrades
• Lead debugging, troubleshooting, and analysis of service architecture and design
• Use code review to drive up the quality of your coworkers' code
• Reduce the operational overhead required to run infrastructure and services
• Drive projects from conception to completion for efforts spanning the concerns of your team
• Coordinate across programs, collaborating with others to estimate and communicate delivery timelines
• Break projects into milestones and tasks, track progress, and communicate updates to stakeholders
• Identify and communicate changes that may impact stability

Qualifications:

• 8+ years of related engineering experience, with a substantial portion focused on reliability, infrastructure, or platform engineering
• Demonstrated accountability for production systems , you have carried a pager for services that mattered and owned the outcome when they failed
• Strong software engineering fundamentals: you build and ship production code, not only configure tooling
• Experience defining and operating against SLIs and SLOs, and using error budgets to inform engineering priorities
• Depth in production operations: incident command, post-mortem analysis, capacity planning, and observability
• A record of preventing recurrence , reducing incident classes and operational toil, not just closing tickets
• Experience driving changes that span multiple teams, and the communication skills to build alignment without formal authority
• A track record of improving the engineers around you through code review, design feedback, and mentorship
• Experience with large-scale distributed systems in a cloud environment

Desired:

• Familiarity with infrastructure-as-code, container orchestration, and GitOps-style delivery
• Experience with multi-region architecture, failure-domain design, or regional expansion work
• Background in chaos engineering, game days, or other proactive resilience validation