Principal, Software Engineer (L5)

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Principal, Software Engineer (L5) in Remote

Twilio
Full time
Email

Remote
09/30/2026
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Ireland

Responsibilities

Design and deliver carrier test and observability platform components covering active voice and messaging testing, quality scoring, and global test coverage.
Build high-throughput data and alerting systems that provide actionable operational signals.
Extend and harden production LLM systems for automated carrier troubleshooting, including evaluation, observability, and guardrails.
Diagnose cross-boundary failures involving test results, carrier behavior, and platform telemetry.
Contribute to technical designs and reviews, mentor engineers, and establish durable written standards.

Requirements

12+ years of software engineering experience, including significant staff- or principal-level experience working on large-scale systems.
Deep expertise designing, operating, and debugging distributed systems that process high-volume time-series or event data in production.
Experience with alerting, anomaly detection, and failure isolation.
Hands-on experience taking LLM-based systems to production, including context and tool design, evaluation, cost and latency management, and action-enabling guardrails.
Strong proficiency in at least one backend language used at scale, such as Java, Go, or Scala, plus fluency with event streaming and cloud infrastructure.
Ability to communicate complex technical trade-offs clearly in writing and influence peers through design review.
Experience with telecommunications, messaging, voice systems, active network testing, monitoring, quality-of-service measurement, or agentic systems is desired.

Benefits

Remote-first work arrangement based in Ireland, with occasional travel for project or team in-person meetings.
Competitive pay, generous time off, parental and wellness leave, healthcare, and a retirement savings program, with offerings varying by location.
Support for employee volunteering and donation efforts.

Salary: Competitive

Twilio

Twilio is a software company that strengthens businesses by unifying their data to build insightful paths to customers, making them smarter with every interaction and enabling them to outmaneuver their competition. Twilio improves customer engagement by combining customer data and communications ...

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