SpaceX was founded under the belief that a future where humanity is out exploring the stars is fundamentally more exciting than one where we are not. Today, SpaceX is actively developing the technologies to make this possible, with the ultimate goal of making life multiplanetary and expanding consciousness to the stars.
SpaceXSI is building Super Intelligence to help humanity understand the universe. Our teams are building the full Super Intelligence stack: from our Colossus supercomputers, to Grok models, to our suite of applications, including Grok Bot, Grok Build, Grok Imagine, Grok Voice, and X. We're creating a powerful flywheel where more compute trains better models, better models power more useful products, and what we learn from people using those products shapes what we build next.
SOFTWARE ENGINEER, EVALS
The evals team creates and executes instruments for measuring model capabilities and behaviors. These instruments are used to clean datasets, provide feedback for experiments, and track growth throughout training. The evals team also diagnoses why agents fail and how to make improvements both short and long term. We manage the execution infrastructure, design data sets and grading schemes. You will own and elevate our mission-critical research platform that directly accelerates SpaceXSI's frontier work.
You will design, build, and ship delightful and bulletproof systems that engineers love to use every day. This role values a strong attention to details, first principles reasoning, and great taste.
BASIC QUALIFICATIONS:
- 3+ years of experience actively writing code
PREFERRED SKILLS AND EXPERIENCE:
- A track record of shipping high quality projects and a strong sense of urgency
- Exceptional product taste - you have a sharp sense for what “good” looks like in outputs, and you can translate fuzzy notions of quality, helpfulness, truthfulness, and safety into concrete, measurable criteria
- Strong attention to detail
- Previously founded a startup or joined a fast-growing early-stage startup
- Familiarity with AI/ML workflows, annotation tools, or evals
- Experience creating and maintaining component libraries, design systems, or internal tools
COMPENSATION AND BENEFITS:
$175,000 - $275,000 USD
Base salary is just one part of our total rewards package at SpaceXSI, 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.
SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.
Skills Required
- Software engineering proficiency with 3+ years of actively writing code
- Track record of shipping high-quality projects and strong sense of urgency
- Exceptional product taste; translate quality, helpfulness, truthfulness, and safety into measurable criteria
- Strong attention to detail
- Strong communication skills
- Hands-on mindset; contribute directly to company mission
- Previously founded or joined a fast-growing early-stage startup
- Familiarity with AI/ML workflows, annotation tools, or evals
- Experience creating and maintaining component libraries, design systems, or internal tools
xAI Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about xAI and has not been reviewed or approved by xAI.
-
Healthcare Strength — Healthcare is described as comprehensive, including medical, dental, vision, mental health support, and fertility benefits. Additional protections such as disability and life insurance, plus HSA/FSA options, are also outlined.
-
Equity Value & Accessibility — Equity is positioned as a core component of total rewards alongside high base salaries for technical roles. Pre‑IPO stock grants are highlighted as enabling participation in potential company growth.
-
Leave & Time Off Breadth — The package includes flexible or generous PTO, paid holidays, and paid sick days. Company materials also describe flexible vacation policies intended to help manage fast‑paced workloads.
xAI Insights
What We Do
Understand the Universe
