As a Senior Fullstack Software Engineer, you will design and build fullstack systems for AI agents, collaborating with engineering, product, and design teams while documenting findings and participating in technical discussions.
About 11x
About the Role
What You'll Do
Most of what Go-to Market teams do all day isn't selling. It's research, list-building, follow-ups, and data entry — work that should never have been a human job in the first place.
We're building a system of AI workers that own GTM execution end-to-end. Alice creates demand, and Julian captures it. They take the busywork off the table so GTM teams can can do what they do best: building relationships and closing deals.
Backed by $75M+ from a16z and Benchmark, headquartered in San Francisco, and trusted by Checkr, Xerox, Sage, and Armanino. We're hiring ambitious people who want to define how the next generation of companies accelerate growth.
Why 11x NowAt 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.
We're looking for a fullstack engineer with a passion for applied research and cross-functional collaboration. In this role, you’ll work closely with engineering leadership and our AI partners to prototype, build, and scale the next generation of autonomous digital workers.
This is an immersive opportunity to deepen your expertise in large language model applications, system design, and human-AI interaction—while learning how fast-moving AI companies operate from the inside. You’ll gain hands-on exposure to the latest model capabilities, contribute to internal experimentation, and help translate cutting-edge ideas into real-world tools.
- Design, build, and iterate on fullstack systems that power AI agents from concept to deployment.
- Research and evaluate new approaches to agent orchestration, prompting strategies, and model alignment.
- Collaborate with product, design, and engineering teams to improve UX and usability for non-technical users.
- Share learnings, document findings, and contribute to the evolution of internal best practices.
- Participate in peer reviews, brainstorming sessions, and technical deep dives with our global team.
- 3+ years of experience in a product-oriented software engineering role.
- A strong foundation in Typescript, React, NextJS, and NodeJS.
- Experience working in fast-paced environments with a track record of rapid learning and iteration.
- Interest in research, technical writing, or contributing to knowledge-sharing within a team.
- Bonus: experience with large language models, prompt engineering, or AI infrastructure.
Canada base salary range: CAD $180,000 – $225,000
Seattle base salary range: USD $150,000 – $250,000
*Final offer will be based on a variety of factors, including role level, relevant experience, skills, and job-related expertise.
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.
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What you need to know about the Los Angeles Tech Scene
Los Angeles is a global leader in entertainment, so it’s no surprise that many of the biggest players in streaming, digital media and game development call the city home. But the city boasts plenty of non-entertainment innovation as well, with tech companies spanning verticals like AI, fintech, e-commerce and biotech. With major universities like Caltech, UCLA, USC and the nearby UC Irvine, the city has a steady supply of top-flight tech and engineering talent — not counting the graduates flocking to Los Angeles from across the world to enjoy its beaches, culture and year-round temperate climate.
Key Facts About Los Angeles Tech
- Number of Tech Workers: 375,800; 5.5% of overall workforce (2024 CompTIA survey)
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- Funding Landscape: $11.6 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Strong Ventures, Fifth Wall, Upfront Ventures, Mucker Capital, Kittyhawk Ventures
- Research Centers and Universities: California Institute of Technology, UCLA, University of Southern California, UC Irvine, Pepperdine, California Institute for Immunology and Immunotherapy, Center for Quantum Science and Engineering
