Senior Software Engineer (L3)

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Senior Software Engineer (L3) in USA new

Twilio
Full time
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USA
10/03/2026
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Remote

Responsibilities

Design and deliver scalable, cloud-native platform components and transition legacy systems to modern microservices.
Build and maintain high-volume public-facing APIs, backend services, tooling, and application workflows.
Use GitHub Copilot, Anthropic Claude, internal LLMs, and other AI tools for code generation, testing, debugging, and prototyping.
Own end-to-end feature delivery, technical decisions, system reliability, security improvements, and technical debt reduction.
Identify and resolve performance bottlenecks, vulnerabilities, and incidents while performing on-call duties and root-cause remediation.
Author technical specifications, RFCs, design documents, operational runbooks, and other documentation.
Mentor junior engineers, onboard team members, conduct code reviews, and provide technical guidance.

Requirements

At least 5 years of experience designing and developing highly available, high-scale, secure, mission-critical cloud-native enterprise distributed systems.
Strong proficiency in Java or Go and solid knowledge of AWS, including Lambda, EKS, DynamoDB, and Kafka.
Hands-on experience with cloud-native infrastructure, microservices patterns, and highly resilient systems.
Practical experience using AI tools such as Copilot, Claude, or Cursor for software delivery, debugging, code synthesis, and prototyping.
Experience building and maintaining high-volume public-facing APIs with a focus on developer experience.
Experience with high-throughput data processing and storage technologies such as SQL, NoSQL, Redis, Kafka, or Spark.
Familiarity with Kubernetes, Terraform, and modern CI/CD practices.
Ability to influence technical decisions through strong communication and technical credibility.
Preferred experience building internal platforms and integrating AI agents into developer platforms or automated operations workflows.

Benefits

Remote-first work arrangement with occasional in-person project or team meetings and occasional travel.
Competitive pay, paid time off, parental and wellness leave, healthcare, retirement savings, and other location-dependent benefits.
Potential eligibility for equity and corporate bonus plans.
Applications are intended to remain open until 30 November, subject to business needs.

Salary: $142k - $208k/yr

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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