Principal Software Engineer, L5

🔥 1 hour ago

🇮🇪 Ireland – Remote

⏰ Full Time

🔴 Lead

🧑‍💻 Full-stack Engineer

👻 Ghost score 10%

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Twilio

WebsiteLinkedInAll Job Openings

5001 - 10000 employees

🔌 API

🤝 B2B

API • B2B

Twilio is a leading provider of cloud communications services that enables developers to build innovative communication solutions. Founded in 2008, Twilio has democratized access to communication channels such as voice, text, chat, video, and email through easy-to-use APIs. With headquarters in San Francisco and a global presence, Twilio empowers organizations of all sizes to engage effectively with their customers by integrating these communication capabilities into their applications.

📋 Description

• Design and deliver major components of Twilio's carrier test and observability platform for active voice and messaging testing, quality scoring, and global test coverage • Build high-throughput data and alerting systems that turn data into actionable signals for operations teams • Extend and harden production LLM systems for automated carrier troubleshooting • Expand the classes of carrier issues resolved without human intervention • Own evaluation, observability, and guardrails for safe autonomous action • Diagnose cross-boundary failures involving test results, carrier behavior, and platform telemetry • Establish observability to distinguish differing failure cases • Contribute to technical design and review across the team • Mentor engineers and help shape written standards

🎯 Requirements

• 12+ years of software engineering experience, including significant time at staff or principal level working on systems at large scale • Deep expertise designing, operating, and debugging distributed systems that ingest and process high-volume time-series or event data in production, including alerting, anomaly detection, and failure isolation • Hands-on experience taking LLM-based systems to production and maintaining them, including context and tool design, evaluation against real outcomes, cost and latency management, and guardrails for actions triggered by model output • Strong proficiency in at least one backend language used at scale: Java, Go, Scala, or similar • Fluency with event streaming and cloud infrastructure, including Kafka, AWS, and Kubernetes • Ability to communicate complex technical trade-offs clearly in writing and influence peers through design review • Experience with telecommunications, messaging, or voice systems • Experience with active network testing, monitoring, or quality-of-service measurement • Experience with agentic systems that take action on live infrastructure and evaluation practices for trustworthy operation

🏖️ Benefits

• Competitive pay • Generous time off • Ample parental and wellness leave • Healthcare • Retirement savings program • Support for volunteering and donation efforts • Remote-first work arrangement • Occasional in-person team gatherings, functional off-sites, customer meetings, and project or team meetings