Senior 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. We use Artificial Intelligence (AI) to help make our hiring process efficient. That said, every hiring decision is made by real Twilions! . See yourself at Twilio Join the team as Twilio’s next Senior Software Engineer. About the job This position is needed to deliver the best-in-class Twilio SDK experience for our customers. Twilio’s SDK engineering team builds robust, powerful SDKs and a GraphQL layer to enable developers build their own Contact Center UIs and real-time AI Contact Center products. Many other teams rely on integrating and exposing their services via the Unified SDK layer to deliver their advanced features to our customers. The position is especially critical in supporting Twilio’s expansion and will be central to creating a core product that provides leverage to all of Twilio’s Flex Contact Center and engineering teams! Responsibilities In this role, you’ll: Design, build, and maintain large-scale backend services with a focus on reliability, availability, scalability, and performance. Lead technical design efforts and ensure architecture decisions are well-documented and future-proof. Collaborate closely with senior engineers, product managers, and cross-functional stakeholders. Champion high-quality engineering practices, including automated testing, maintainable code, and thorough documentation. Own and continuously improve Twilio’s developer experience for SDK customers. Support customers by troubleshooting issues and promoting backend and SDK best practices. Contribute to operational excellence by maintaining a high reliability bar and participating in incident response and system improvements. 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: Bachelor’s/Master’s in Computer Science, Engineering, or related field. 5+ years of experience building and operating cloud-scale backend systems. Strong programming skills in backend languages such as Java or Scala. Experience authoring technical specifications and delivering end-to-end system designs. Strong fundamentals in concurrency and distributed systems. Experience working with AWS or other cloud platforms at scale. Proven ability to maintain a high operational excellence bar and mentor junior engineers on reliability and maintainability. Strong communication skills and the ability to thrive in collaborative, fast-moving teams. Desired: Excellent problem-solving and critical thinking skills. Any prior experience building SDKs and GraphQL BFF layer is an added advantage. Ability to establish backend engineering guidelines and represent the team within the broader Twilio engineering organization. Passion for delivering high-quality products and continuously learning new technologies. Strong sense of ownership and accountability. Comfortable navigating ambiguity and driving clarity in evolving environments. Location This role will be remote and based in the UK Travel We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occa