Staff Software Engineer - LLM / AI Agents

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!

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Join us as Staff Software Engineer for Twilio Stytch’s Agent team and help build the future of agent identity. You will be a foundational member of a team pioneering the next generation of authentication, verification, and identity solutions that will empower AI developers and protect users globally.

You will help scale Stytch’s core product as we bring Stytch capabilities to Twilio’s full customer base, delivering secure, developer-first identity experiences. You’ll design and lead implementation of systems that power authentication, authorization, and emerging agentic and non-human identity use cases. You’ll partner closely with product and engineering leadership to set direction, deliver high-impact features, and evolve our platform for Twilio’s scale. This is a rare chance to operate like a startup within Twilio: you’ll work in a high-ownership environment with startup speed, backed by Twilio’s reach and scale.

We're seeking a talented Staff Engineer who brings deep hands-on technical expertise, a strategic mindset, and a passion for building secure, developer-first experiences. You'll thrive in this role if you excel at navigating ambiguity, enjoy tackling complex technical challenges from scratch, and can make critical architectural decisions that will shape the foundation of our new identity platforms.

In this role, you’ll:

• →Build and own product capabilities for Stytch’s agentic identity platform on Twilio.
• →Design, implement, and maintain scalable, reliable distributed services, optimizing for security, latency, and developer experience.
• →Partner with Product and Engineering leadership to set direction, translate customer needs into technical plans, and deliver high-impact roadmap features.
• →Collaborate across Twilio and Stytch teams to align on architecture, integrate platform capabilities, and unblock cross-team initiatives.
• →Write clean, maintainable, and well-tested code, setting a high bar for technical excellence across the team.
• →Own the end-to-end lifecycle of new services, from initial design and prototyping through to production deployment and operational readiness.
• →Mentor other engineers on the team, fostering a culture of innovation, ownership, and continuous learning.
• →Communicate complex technical concepts effectively to diverse audiences, from fellow engineers to executive leadership.
• →Stay at the forefront of industry trends and emerging threats in identity and authentication to ensure our products are secure and innovative.

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!

• 7+ years of experience building and operating highly scalable, distributed systems, with a focus on security, reliability, and performance.
• Experience working with agents and/or LLMs.
• Strong hands-on coding skills and a willingness to dive deep to solve complex problems.
• Demonstrated expertise in designing and implementing resilient, fault-tolerant systems.
• Experience making high-impact technical decisions and leading technical initiatives.
• A proven track record of driving technical excellence while keeping customer needs at the center of your work.
• Deep understanding of software engineering best practices, including monitoring, observability, and building for the long term.
• Exceptional communication and collaboration skills, with the ability to influence and align stakeholders.
• Experience mentoring engineers and elevating the technical capabilities of a team.
• Degree in Computer Science or a related field, or equivalent work experience.

• Experience building 0-to-1 products or working in a startup environment.
• Deep experience with identity and access management, modern authentication protocols, and security architecture.
• Knowledge of technologies like OAuth, SAML, OIDC, WebAuthn, passkeys, and zero-trust security principles.
• Familiarity with modern verification techniques, including biometrics, document verification, and risk-based authentication.
• Background in developing APIs and SDKs with a strong focus on developer experience.
• Familiarity with Go, Kubernetes, and DynamoDB

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.