Fullstack Engineer

xAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All engineers are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

We are building AI-powered platforms for transformative applications in education. This work involves creating scalable, AI-driven systems with personalized interactions, adaptive features, content delivery, and analytics to deliver meaningful user experiences at scale.

We’re looking for generalist fullstack engineers who thrive on owning significant parts of the system end-to-end: from intuitive user interfaces to robust backend services, data infrastructure, and deep AI integrations.

• Build and maintain fullstack features, including user dashboards, personalized experiences, content delivery, interactive tools, assessments, and real-time analytics.
• Develop backend services, APIs, and data models to support high-volume, multi-user environments.
• Integrate AI capabilities (tutoring, content generation, personalization) deeply into the platform.
• Design and implement database schemas and queries for tracking progress, engagement, and reporting.
• Collaborate on integrations with external systems and data sources to enable comprehensive workflows.
• Ensure the platform is performant, secure, reliable, and scalable for broad deployment.
• Work closely with product, design, AI, and domain experts to iterate rapidly based on user feedback and outcome data.

• Experienced fullstack engineer comfortable owning features across the entire stack (frontend, backend, database).
• Strong generalist who can fluidly move between UI/UX implementation, API design, data modeling, and systems architecture.
• Proficient in modern web technologies (e.g., TypeScript/React/Next.js on the frontend; Python/FastAPI or similar on the backend).
• Solid experience with relational databases and designing schemas for complex domains.
• Good eye for UX design and strong attention to detail.
• Familiarity with large-scale user-facing applications or domain-specific platforms is a strong plus.
• Passionate about building products that create real-world impact.
• Excited to work in a fast-moving, high-impact environment with significant ownership.
• Willingness and ability to travel frequently to the customer site in El Salvador and/or work onsite as required by project needs
• Full professional fluency in English and Spanish (bilingual), with excellent verbal and written communication skills in both languages

• Primarily JavaScript/TypeScript and Python
• Frontend: React, Next.js
• Backend: FastAPI or Django
• Database: SQL, Redis
• Infrastructure: AWS/GCP, Docker, Kubernetes
• Other: REST/GraphQL APIs, real-time features (WebSockets), analytics pipelines

After submitting your application, the team reviews your CV and statement of exceptional work. If your application passes this stage, you will be invited to a 15 minute interview (“phone interview”) during which a member of our team will ask some basic questions. If you clear the initial phone interview, you will enter the main process, which consists of 2 technical interviews and 1 project deep-dive interview:

1. Practical coding assessment in a language of your choice.
2. Systems design hands-on: Demonstrate practical skills in a live problem-solving session.
3. Project deep-dive: Present and answer questions about exceptional work that you’ve done.
4. Meet and greet with the wider team.

Our goal is to finish the main process within one week. Final interviews will be conducted in person.

$180,000 - $440,000 USD

Base salary is just one part of our total rewards package at xAI, which also includes equity, comprehensive medical, vision, and dental coverage, access to a 401(k) retirement plan, short & long-term disability insurance, life insurance, and various other discounts and perks.

xAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.