Staff Fullstack Engineer, AI Agents

Why 11x Now

At 11x, we're building autonomous digital workers that handle routine work end-to-end, freeing humans to focus on what they do best—creating, innovating, and building meaningful relationships. We're one of the world’s fastest-growing AI companies. We've achieved a 20x increase in ARR and raised $75M+ from leading investors including a16z and Benchmark. Our team works in-person in our San Francisco office.

About the Role

We’re looking for a Staff Software Engineer with deep fullstack expertise and a passion for building ambitious AI-powered systems. In this role, you’ll operate as a technical lead—driving architecture, product development, and internal standards for one of our flagship autonomous digital workers.

You’ll collaborate closely with our CTO, cross-functional teams, and model providers to translate complex ideas into elegant, production-ready software. This is a hands-on leadership role where you’ll influence system design, mentor other engineers, and set the bar for engineering quality in a fast-moving, AI-native environment.

What You’ll Do

• Architect, build, and scale fullstack systems that support autonomous AI agents in production.

• Lead technical decision-making across projects—ensuring long-term scalability, reliability, and developer efficiency.

• Evaluate new technologies, model APIs, and prompting strategies to enhance agent performance and alignment.

• Collaborate cross-functionally with design, product, and GTM teams to define roadmaps and prioritize development.

• Drive internal engineering standards through mentorship, documentation, and code reviews.

What We’re Looking For

• 6+ years of experience in software engineering, with demonstrated leadership on complex technical projects.

• Strong command of modern fullstack frameworks—especially Typescript, React, NextJS, and NodeJS.

• Track record of shipping scalable systems in high-growth or startup environments.

• Strategic thinker who can balance speed and quality while driving technical vision.

• Bonus: experience with LLMs, agent orchestration frameworks, or AI infrastructure.

11x is an equal opportunity employer and does not discriminate on the basis of race, gender, sexual orientation, gender identity/expression, national origin, disability, age, genetic information, veteran status, marital status, pregnancy or related condition, or any other basis protected by law.