Senior Engineer (Internal Tools)

Join xAI as a Senior Engineer (Internal Tools) and take ownership of our mission-critical research platform. You will design, build, and ship scalable systems that researchers and engineers love to use every day. This role values product ownership, taste, and narrow specialization. Enjoy comprehensive health insurance, flexible vacation, visa sponsorship, and a 401(k) plan.

• Ownership and elevation of the mission-critical research platform that accelerates xAI’s frontier work.
• Designing, building, and shipping delightful, performant, and scalable systems that researchers and engineers love to use.
• Contributing to Toolbox — the unified Research Platform for model training orchestration, evaluations, benchmarking, and experiment management.
• We are looking for exceptional engineers and builders with great taste, strong product sense, excellent prioritization, and outstanding communication skills
• Strong product intuition and ownership mindset
• Strong taste & sensitivity — you have a sharp sense for quality. You can naturally feel and detect what feels good versus what feels off or uncomfortable across everything you build (frontend interfaces, backend APIs, data flows, system architecture, etc.)
• Proven technical excellence in at least one area (UX/frontend, backend, data, agentic systems, etc.)
• Excellent prioritization skills — you know how to ruthlessly focus on high-impact work in a fast-moving environment
• Outstanding communication skills — you can clearly articulate trade-offs, technical decisions, and product thinking to both technical and non-technical stakeholders
• Previously founded a startup or joined a fast-growing early-stage startup
• Familiarity with AI/ML workflows, annotation tools, or research platforms
• Experience creating and maintaining component libraries, design systems, or internal tools
• Background in UX design, product management, or related fields
• Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates