Staff Software Engineer - LLM / AI Agents

Twilio

15h • Remote

About The Position

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.

Requirements

• 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.

Nice To Haves

• 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

Responsibilities

• 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.

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level