Software Engineer, (L2) Audiences & Journeys

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 our next Software Engineer - CDP About the job Segment is a best-in-class customer data platform (CDP) designed with engineers, marketers, and product managers in mind. We’re excited to work at the cutting edge of data and artificial intelligence, such as with our AI-Assisted Suggest Mappings product . And, we move a lot of data - over 12 trillion API calls a year . This position is needed to build and scale APIs to enable Twilio developers to unlock best-in-class personalized customer experiences through the Twilio Audiences Journeys products. As a Software Engineer on the team, you will collaborate closely with product management, architecture, and other engineering teams to design APIs, identify performance bottlenecks, and data models, and drive system-level improvements that enhance both developer velocity and customer experience. You’ll be expected to evaluate and communicate trade-offs between feature velocity, system stability, and technical debt, and help drive architectural decisions that ensure long-term sustainability and performance. We iterate quickly on these products and features and learn new things daily — all while writing quality code using the latest AI tools. We work closely with product and design and solve some of the toughest engineering problems to unlock new possibilities for our customers. If you get excited by building products with high customer impact — this is the place for you. Responsibilities In this role, you’ll: Design and build robust, scalable backend systems and APIs that power audience journey creation, segmentation, and activation across Segment’s data platform. Collaborate cross-functionally with design, product, and other engineers to define solutions that balance usability, performance, and long-term architecture. Communicate technical decisions clearly - articulating trade-offs, customer impact, and team alignment. Mentor junior engineers and contribute to a culture of technical excellence and continuous learning. Troubleshoot and improve system reliability, debugging issues and refining operational tooling and processes. Participate in an on-call rotation for our managed services Qualifications Not all applicants will have skills that match a job description exactly. Twilio values diverse experiences in other industries, and we encourage everyone who meets the required qualifications to apply. While having “desired” qualifications make for a strong candidate, we encourage applicants with alternative experiences to also 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: 2 years experience writing production-grade code in a modern programming language Experience programming in one or more of the following: Go, Java, Python, or similar languages Experience operating large-scale, distributed systems on top of cloud infrastructure such as Amazon Web Services (AWS) Have hands-on experience with container orchestration frameworks (e.g. Kubernetes, EKS, ECS) Have experienc ... (truncated, view full listing at source)