Software Engineer, Evals

SpaceXSI; Palo Alto (CA); On-site; USD 175,000 - 275,000; Full time

Benefits offered by this job

Equity

Medical, Vision, Dental coverage

401(k) retirement plan

Disability & life insurance

Employee discounts

Job summary

SpaceXSI in Palo Alto is seeking a Software Engineer for the Eval s team. You will design, build, and ship reliable systems used to measure model capabilities and guide experiments.

You will own the research platform and work with data sets, grading schemes, and instrumentation to accelerate frontier work. You will collaborate with engineers to implement robust pipelines, maintain component libraries and design systems, and demonstrate strong attention to detail and first-principles reasoning in

Qualifications

• 3+ years of experience actively writing code.
• Track record of shipping high-quality projects.
• Strong attention to detail and product taste.
• Startup experience or experience in fast-growing teams.
• Familiarity with AI/ML workflows or evals.

Responsibilities

• Design, build, and ship bulletproof evals infrastructure and tooling.
• Own and elevate our mission-critical research platform.
• Collaborate with engineers to improve datasets and grading schemes.
• Contribute to improving model capabilities, safety, and alignment.

Skills

Coding experience

Shipping high quality projects

Product taste

Attention to detail

Startup experience

AI/ML workflows familiarity

Tools

Component libraries

Design systems

Internal tools

Job description

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 behaviours. 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.