Software Engineer (L3) Data Substrate

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 Software Engineer, Email Platform (L3)   About the job This position is a critical engineering role within Twilio SendGrid, requiring a hands-on engineer capable of developing, deploying, and managing highly available, massive-scale distributed systems. Our systems regularly process more than 12 billion emails during peak events like Black Friday, and our throughput requirements continue to scale rapidly. As an L3 engineer, you will act as a key driver of execution within our core services. You will be heavily involved in modernizing our backend systems, optimizing our extensive Go-based microservices, and contributing to the design and reliability of our dual-cloud infrastructure span across Amazon Web Services (AWS) and Microsoft Azure. Responsibilities In this role, you’ll: * WEAR THE CUSTOMER’S SHOES: Architect and ship reliable, high-velocity features that handle critical traffic with low end-to-end latency. Partner closely with product management and technical leadership to break down complex system requirements into manageable, iterative milestones. * BE AN OWNER (CODE QUALITY): Drive rigorous code reviews and push for maintainable patterns in our Go codebase, ensuring high testing standards (unit, integration, and component testing) are executed across the team. * BE AN OWNER (INFRASTRUCTURE & OBSERVABILITY): Manage and enhance cloud configurations across AWS and Azure environments utilizing Infrastructure as Code (Terraform). Ensure deep observability coverage by standardizing metrics, alerts, and distributed tracing across core data pipelines. * CHAMPION ENGINEERING HEALTH: Advocate for a clean architectural foundation. Proactively identify technical debt, system bottlenecks, and single points of failure (SPOF), balancing feature delivery with critical platform refactoring. * MENTOR AND LEAD: Foster a collaborative environment by mentoring junior engineers, leading technical sprint planning, and sharing expertise across distributed engineering nodes. 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: * Experience: 4+ years of professional software engineering experience building and operating resilient backend services at scale. * Modern Development Workflow: Practical experience leveraging AI-assisted development tools (such as Claude Code) to accelerate code generation, automate testing, and streamline debugging workflows. * Language Proficiency: Strong, hands-on production experience writing clean, idiomatic, and highly concurrent Go (Golang), Java or Python. * Cloud Infrastructure: Solid experience deploying and managing production workloads in cloud environments—ideally with deep exposure to AWS core services (such as EC2, S3, Aurora, or DynamoDB) AND Microsoft Azure equivalents (such as Virtual Machines, Blob Storage, Azure SQL, or Cosmos DB). * Infrastructure as Code: Proficiency with Terraform for provision-level automation and maintaining environment parity. * Distributed Systems: Strong theoretical and practical understanding of distributed datastores, caching layers, and asynchronous event streaming (e.g., Kafka or similar queuing ecosystems). * Systems Mindset: Strong foundational background in computer science fundamentals, data structures, and building self-healing cloud architectures. DESIRED: * Prior experience managing high-throughput applications running inside containerized infrastructure (Docker, Kubernetes). * Familiarity with database migration pathways (e.g., transitioning traditional on-prem/relational datastores to managed instances like AWS Aurora). * Experience implementing OpenTelemetry or distributed tracing systems across decoupled microservice platforms. * Direct experience handling constraints related to network topology, proxy layers, or mail transfer agent (MTA) protocols.   Location This role will be remote, but is not eligible to be hired in CA, CT, NJ, NY, PA, WA.   Travel  We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in-person meetings.   What We Offer Working at Twilio offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location.   Compensation *Please note the salary range information provided applies only to candidates residing in California, Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, New Jersey, New York, Vermont, Washington D.C., and Washington State due to local requirements. Compensation for candidates in other locations will be discussed during the hiring process. Please note that hiring for this role is not restricted to the locations listed above. The estimated pay ranges for this role are as follows: * Based in Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, Vermont or Washington D.C. : $138,700 - $173,400 * Based in New York, New Jersey, Washington State, or California (outside of the San Francisco Bay area): $146,800 - $183,600 * Based in the San Francisco Bay area, California: $163,100 - $203,900. * This role may be eligible to participate in Twilio’s equity plan and corporate bonus plan. All roles are generally eligible for the following benefits: health care insurance, 401(k) retirement account, paid sick time, paid personal time off, paid parental leave. The successful candidate’s starting salary will be determined based on permissible, non-discriminatory factors such as skills, experience, and geographic location..    Applications for this role are intended to be accepted until 7/28/2026, but may change based on business needs.  Twilio thinks big. Do you? We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts. So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now! If this role isn't what you're looking for, please consider other open positions. Twilio is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Twilio participates in the E-Verify program in certain locations, as required by law.

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 Software Engineer (L2) About the job We are looking for a talented Software Engineer to join our Messaging team. We are searching for engineers that take pride in delivering quality products and are enthusiastic about technology and strive for the opportunity to learn and share their knowledge. You’ll help us build and scale systems that support the core Messaging and Media functionalities in a rapidly evolving market and to provide a trusted experience to our customers. In this role, you will play a crucial part in designing, building, and optimizing our platform to support a wide range of messaging use-cases. You will work closely with cross-functional teams to understand business requirements, design and implement reliable, scalable solutions for our Messaging Platform. About You: * Will bring your unique set of diverse experiences and background to our team in an open and collaborative manner so that we can all expand and grow faster. * Have a desire to leverage your expertise but also dive into lesser known areas of technology, architecture, or whatever is needed to solve engineering day-to-day challenges. * Have an open and honest communication style that always puts the customer first “Will the customer be delighted with this?”. * Are comfortable dealing with ambiguity and a shifting landscape. * Are curious, willing to learn, share and improve. * You have a strong sense of ownership and accountability for the product you are delivering. Responsibilities In this role, you’ll: * Design and build large-scale distributed messaging and media systems with a focus on reliability, availability, scalability and performance. * Work closely with stakeholders and product teams to gather business requirements and translate them into effective technical solutions. * Own your code end-to-end from development to deployment and provide operational support through on-call rotations. * Take ownership of troubleshooting and resolving operational issues, with opportunities to enhance existing troubleshooting processes and tools. * Participate in the refinement of the team's ticket backlog, estimating work and follow Agile ceremonies.  * Mentor early in career engineers and contribute to a culture of continuous learning and improvement. 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 Degree in CS or related field or equivalent working experience. * 3+ years of related software development experience shipping multiple products / services. * Proficiency in one or more programming languages including Java, Scala, C, C++ and advanced concepts like asynchronous programming, multi-threading etc.  * Experience in AWS cloud solutions, Kubernetes/EKS, CI/CD pipelines like Buildkite & containerization frameworks like Docker. * Experience with asynchronous communication patterns like Kafka, SQS, RabbitMQ etc * Experience with relational and non-relational databases, SQL queries, query optimizations and ETL tools. * Experience with Testing & Automation. * Curiosity and interest in learning new programming languages and frameworks.  * Working in agile teams or startup environments with strong customer focus. Commitment for engineering practices that ensure safe and fast paced releases of services.  * Demonstrated organizational agility, cross-team collaboration, commitment for results, and excellent written and verbal communications. Desired: * On-call experience debugging large scale distributed systems. * Experience with Devops infrastructure, specifically IaC tools like Terraform and ArgoCD. * A strong plus if you have prior experience with MMS/SMS/RCS messaging protocols. * Experience designing and implementing large scale solutions. * Experience working in distributed and concurrent systems. * Proficiency in debugging production infrastructure and services. * Ability to work independently and as part of a team. Travel  We prioritize connection and opportunities to build relationships with our customers and each other. For this role, you may be required to travel occasionally to participate in project or team in-person meetings. What We Offer Working at Twilio offers many benefits, including competitive pay, generous time off, ample parental and wellness leave, healthcare, a retirement savings program, and much more. Offerings vary by location. Compensation "*Please note the salary range information provided applies only to candidates residing in California, Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, New Jersey, New York, Vermont, Washington D.C., and Washington State due to local requirements. Compensation for candidates in other locations will be discussed during the hiring process. Please note that hiring for this role is not restricted to the locations listed above." The estimated pay ranges for this role are as follows: * Based in Colorado, Hawaii, Illinois, Maryland, Massachusetts, Minnesota, Vermont or Washington D.C. : $116,960 - 146,200 * Based in New York, New Jersey, Washington State, or California (outside of the San Francisco Bay area): $123,760 - 154,700 * Based in the San Francisco Bay area, California: $137,520 - 171,900 * This role may be eligible to participate in Twilio’s equity plan and corporate bonus plan. All roles are generally eligible for the following benefits: health care insurance, 401(k) retirement account, paid sick time, paid personal time off, paid parental leave. The successful candidate’s starting salary will be determined based on permissible, non-discriminatory factors such as skills, experience, and geographic location. Applications for this role are intended to be accepted until June 20th, 2026, but may change based on business needs.      Twilio thinks big. Do you? We like to solve problems, take initiative, pitch in when needed, and are always up for trying new things. That's why we seek out colleagues who embody our values — something we call Twilio Magic. Additionally, we empower employees to build positive change in their communities by supporting their volunteering and donation efforts. So, if you're ready to unleash your full potential, do your best work, and be the best version of yourself, apply now! If this role isn't what you're looking for, please consider other open positions. Twilio is proud to be an equal opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex (including pregnancy, childbirth, reproductive health decisions, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, genetic information, political views or activity, or other applicable legally protected characteristics. We also consider qualified applicants with criminal histories, consistent with applicable federal, state and local law. Qualified applicants with arrest or conviction records will be considered for employment in accordance with the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Additionally, Twilio participates in the E-Verify program in certain locations, as required by law.