---
title: 'Senior Fullstack Software Engineer, AI Agents at 11x.ai'
canonical: 'https://feeny.ai/job/senior-fullstack-software-engineer-ai-agents-11x-ai-seattle-9zfsnb912svx'
type: 'job'
last_seen: '2026-09-11'
---

# Senior Fullstack Software Engineer, AI Agents at 11x.ai

- **Company:** 11x.ai
- **Location:** Seattle, WA
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2025-12-31
- **Last confirmed live:** 2026-09-11
- **Apply:** https://jobs.gem.com/11x-ai/am9icG9zdDoKcyhjwa6EhA7mvhoYwzIf

## Job description

## About the Role

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.

## What You'll Do

- 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.

Ideal Candidates Have

- 6+ 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 $180,000 – $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.

## About 11x.ai

## Company Overview
- **One-liner**: 11x.ai builds autonomous AI "digital workers" — such as AI SDR Alice and AI phone agent Julian — that automate outbound revenue and go-to-market workflows for sales, marketing, and growth teams.
- **Entity Type**: Private (Series B)
- **Headquarters**: San Francisco, California, United States
- **Founded**: 2023
- **Founders**: Not publicly available

## Core Business
- **Primary industries**: AI / Automation / Sales Technology (GTM)
- **Target customers**: B2B, high-growth startups to large enterprises (e.g., Xerox, UST, Gupshup, Sage, Checkr, Rho)
- **Mission/purpose**: To elevate human work by deploying digital workers that handle essential but mundane revenue tasks, enabling companies to "scale faster and smarter" while freeing people for higher-impact work.

## Products & Services
- **Alice – AI SDR**: Autonomous outbound sales development representative that filters signals across 50+ data sources, enriches prospect data, personalizes messaging, and runs multi-channel sequences across email, phone, social, and SMS to book qualified meetings.
- **Julian – AI Phone Agent**: A voice AI agent that runs natural-language sales and customer conversations, listens, handles objections, adapts mid-call, and works around the clock across multilingual use cases.
- **Autonomous Digital Workers Platform**: A unified, enterprise-ready platform that covers the full pipeline from prospecting to closed-won, integrating with existing tools and continuously learning from every interaction.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total funding of **$96M** (including a $50M Series B led by Andreessen Horowitz) and annual revenue reported at **$24.5M**
- **Notable Investors/Partners**: Andreessen Horowitz (a16z), Benchmark, Project A Ventures; customers include Xerox, UST, Gupshup, Sage, Checkr, and Rho
- **Growth Signals**:
  - ~63 employees spread across 13 countries (US, UK, India, Canada, Germany, and more)
  - 24/7 operations with multilingual capabilities
  - Active hiring across engineering, design, growth, sales, and voice-agent roles (13+ current openings)

## Competitive Advantages
- **Fully autonomous AI agents** that execute complex sales workflows without supervision, not just assistive tools
- **Continuous learning** from each interaction, improving performance over time
- **Deep integrations** and multi-channel orchestration across email, phone, social, and SMS
- **Enterprise-grade security**: SOC-2 compliant, end-to-end encryption
- Strong backing from top-tier VCs with an early revenue base ($24.5M ARR) — rare for a Series B AI startup

## Strategic Focus
- Expanding its digital workforce beyond sales development to cover more GTM functions
- Scaling deployments globally (US and UK presence with global remote team)
- Deepening enterprise adoption and building out the "full-pipeline" platform
- Hiring product engineers, full-stack engineers, data engineers, and voice-agent specialists to accelerate product development

## Why Work Here
- **Culture**: Fast-moving, mission-driven AI startup focused on reinventing how GTM teams work with autonomous digital workers
- **Remote/hybrid**: Flexible — some roles are remote (e.g., Senior Fullstack Engineer, AI Agents) while others are San Francisco-based; headquarters at 677 Harrison Street, SF
- **Compensation indicators**: Posted ranges include $170,000–$200,000 for Data Engineer and $150,000–$250,000 for Product Engineer
- **Backing and scale**: Work with a well-capitalized startup (a16z, Benchmark) in one of the hottest AI-agent categories, with a distributed team across 13 countries

## Sources
1. [11x.ai](https://www.11x.ai/)
2. [11x.ai - About Us](https://www.11x.ai/about-us)
3. [LinkedIn - 11x](https://linkedin.com/company/11x-ai)
4. [a16z Jobs - Careers at 11x](https://jobs.a16z.com/jobs/11x.ai)
5. [Gem - 11x.ai Careers](https://jobs.gem.com/11x-ai)

## Other roles at 11x.ai

- [Data Engineer](https://feeny.ai/job/data-engineer-11x-ai-san-francisco-vwjrrxnk0g5c) — San Francisco, CA
- [Growth Engineer](https://feeny.ai/job/growth-engineer-11x-ai-san-francisco-ah5vt2sqx9wy) — San Francisco, CA
- [Senior Fullstack Software Engineer, AI Agents - Remote](https://feeny.ai/job/senior-fullstack-software-engineer-ai-agents-remote-11x-ai-pn8zrj9m9dp6)
- [Account Executive](https://feeny.ai/job/account-executive-11x-ai-san-francisco-ykxdj14rqtrq) — San Francisco, CA
- [Account Executive (London)](https://feeny.ai/job/account-executive-london-11x-ai-london-79tp6x1xkpnc) — London, United Kingdom
- [Voice Agent Engineer (Full stack)](https://feeny.ai/job/voice-agent-engineer-full-stack-11x-ai-san-francisco-awzdwnfm5sk5) — San Francisco, CA
- [Senior Customer Success Manager](https://feeny.ai/job/senior-customer-success-manager-11x-ai-san-francisco-ppk7nn7ev2e5) — San Francisco, CA
- [Staff Fullstack Engineer, AI Agents](https://feeny.ai/job/staff-fullstack-engineer-ai-agents-11x-ai-san-francisco-0ezsmzq52ydr) — San Francisco, CA
- [Fullstack Software Engineer, AI Agents](https://feeny.ai/job/fullstack-software-engineer-ai-agents-11x-ai-san-francisco-eazkvnzy87am) — San Francisco, CA