11x

Staff Fullstack Engineer, AI Agents

Reposted 10 Hours Ago

Hiring Remotely in San Francisco, CA, USA

In-Office or Remote

Senior level

Artificial Intelligence • Marketing Tech • Sales • Conversational AI

11x is building AI-native digital workers that automate entire GTM workflows—so teams can focus on what matters most.

The Role

The role involves leading the architecture, development, and scalability of fullstack systems for AI agents while mentoring engineers and making technical decisions.

Summary Generated by Built In

About 11x

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.

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.

Base salary range: $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.

Skills Required

6+ years of experience in software engineering
Strong command of modern fullstack frameworks
Track record of shipping scalable systems
Experience with LLMs or AI infrastructure

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The Company

HQ: San Francisco, CA

36 Employees

Year Founded: 2025

What We Do

At 11x, we’re not just building tools—we’re redefining how work gets done. We build autonomous digital workers that execute entire go-to-market workflows, end-to-end. Instead of just augmenting tasks with AI, 11x automates the full execution of sales, marketing, and RevOps processes so teams can focus on what they do best: building relationships, closing deals, and driving impact. Our technology integrates across GTM systems, adapts to real business logic, and learns continuously while delivering real outcomes. These aren’t just incremental improvements, they’re game-changing leaps forward in how companies grow.

Why Work With Us

Everyone here is a builder. You’ll be starting at the ground floor of a rocket ship company with the rare opportunity to leave your mark, shape the culture, and have a seat at the table as we scale. You’ll work side-by-side with a world-class team—people who move fast, think deeply, and care fiercely. The upside? Massive.