Senior Backend Engineer - Starfleet

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Join to apply for the Senior Backend Engineer - Starfleet role at xAI

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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 and researchers are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

About xAI

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 and researchers are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

The Starfleet team is responsible for creating the tools and systems necessary to drive frontier model performance. We collaborate closely with our research teams and AI tutor teams to develop new solutions that accelerate research progress across model capabilities, evaluation, safety, and alignment.

In this role you might:

• Design and build robust, scalable backend systems to power our AI-driven tools and platforms.
• Develop APIs and distributed systems that handle high-throughput data processing for model training and evaluation.
• Create secure, reliable pipelines to support innovative human data generation and agentic workflows.
• Optimize infrastructure to leverage cutting-edge GPU resources for maximum performance.
• Innovate new approaches that bring us closer to our goal: to develop AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge.

Exceptional candidates may have:

• Experience building high-performance backend systems in dynamic, fast-paced environments - as a tech lead, former founder, etc.
• Expertise in designing scalable distributed systems and APIs with a compiled language like Rust or C++.
• Experience optimizing data pipelines for machine learning workloads or real-time applications.
• Familiarity with frontend technologies (e.g., TypeScript, React) to collaborate seamlessly with cross-functional teams.

• Typescript, Python, Rust
• React, Express, PostgreSQL

The role is based in the Bay Area [San Francisco and Palo Alto]. Candidates are expected to be located near the Bay Area or open to relocation.

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 four technical interviews:

• Coding assessment in a language of your choice.
• Front end technical interview, in React/Typescript
• Systems hands-on: Demonstrate practical skills in a live problem-solving session.
• Meet the Team: Present your past exceptional work and your vision with xAI to a small audience.

Our goal is to finish the main process within one week. All interviews will be conducted via Google Meet.

$180,000 - $440,000 USD

xAI is an equal opportunity employer.

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Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Engineering and Information Technology

• Industries

  Technology, Information and Internet

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