Principal Software Engineer

Who we are 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. Our dedication to remote-first work , and strong culture of connection and global inclusion means that no matter your location, you’re part of a vibrant team with diverse experiences making a global impact each day. As we continue to revolutionize how the world interacts, we’re acquiring new skills and experiences that make work feel truly rewarding. Your career at Twilio is in your hands. . Hiring and how we work We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Twilions! Also, while we are a remote-first company, you may be asked to report in person on an ad-hoc basis for team gatherings, functional off-sites or customer meetings. . See yourself at Twilio Join the team as Twilio’s next Principal Software Engineer. About the job This position is needed to lead the planning, design, development, and testing of large-scale software systems and new product capabilities, including cloud and internet-facing services. You’ll set technical direction, drive delivery using modern engineering practices, and ensure what we ship is secure, compliant, and production-ready. You’ll partner closely with product and engineering teams to turn requirements into reliable, high-quality software. Responsibilities In this role, you’ll: Lead architecture and system design for complex, distributed software systems; guide teams toward scalable, maintainable solutions. Design, implement, and review high-quality code for core services, APIs, platforms, and/or user-facing applications. Translate business goals into technical roadmaps, identify tradeoffs, and align stakeholders on solution direction. Improve system resiliency, latency, throughput, and cost efficiency; establish SLOs/SLAs and operational practices. Drive standards for coding, testing, CI/CD, observability, security, and documentation; champion automation and quality. Partner with engineering managers, staff engineers, and product leaders to coordinate delivery across multiple teams. Coach and mentor engineers at all levels; lead design reviews, incident postmortems, and technical deep dives. Identify technical risks early (security, scalability, compliance) and drive mitigation plans. Qualifications Twilio values diverse experiences from all kinds of industries, and we encourage everyone who meets the required qualifications to apply. If your career is just starting or hasn't followed a traditional path, don't let that stop you from considering Twilio. We are always looking for people who will bring something new to the table! *Required: 12+ years of experience designing and developing highly-available, high-scale, secure, mission critical native cloud enterprise SaaS applications in Java, Go or Python. Knowledge of architectural patterns and archetypes for building mature services, especially for distributed and multi-regional deployments. Excellent abilities in high level service design - modeling interfaces and internals in a proper modular, composable, and extensible way. Experience with AWS, GCP or other public cloud infrastructure platforms. Multi-region deployment is a plus. Experience building distributed systems at scale based on microservices architecture. Extensive experience with REST API design and implementation. Experience working with data architecture such as Clickhouse, Lakehouse, Snowflake Experience with SQL/NoSQL databases and caches. Familiarity with streaming systems such as Kafka, Flink, Spark Experience with container technologies - Docker/Kubernetes. Experience implementing modern automated testing and CI/CD pipelines. Develop, Test, Deploy your code. Strong expertise in solving complex production issues Location This role will be…