Software Engineer, Evaluation Infrastructure
- Salary
- $180,000 - $440,000
- Level
- Mid
Not stated in the posting: work type, visa.
Open. First seen 2 October 2026.
About the role
SpaceXSI's standard text
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, EVALUATION INFRASTRUCTURE
The RL infrastructure team is looking for an engineer to help develop our evaluation infrastructure.
RESPONSIBILITIES:
- Build highly reliable, efficient, and easy to use infrastructure that runs all our evaluations at scale
- Collaborate closely with modeling & evaluation teams on developing new evals, maintaining evaluation signal quality, and building internal tooling to support training our next-generation of models
- Identify and resolve performance bottlenecks in all layers of the eval infrastructure stack, including inference, capacity fleet management, asynchronous eval orchestration, and more
BASIC QUALIFICATIONS:
- Experience writing production-quality code in Python, PyTorch, JAX, Rust, or C++
PREFERRED SKILLS AND EXPERIENCE:
- Experience in building, debugging, and optimizing efficiency of large-scale distributed systems
- Willingness to dive deep and solve hard problems at all levels of the stack
- Experience in LLM inference
- Experience in GPU compute management, workload scheduling, and dynamic resource optimization
- Experience in developing interfaces for comparing models and evals
COMPENSATION AND BENEFITS:
$180,000 - $440,000 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's standard text
SpaceXSI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.
What this role asks for
Standard for software engineering roles
Python
Common in software engineering postings at any company.
59% of this description is written for the role. The rest is SpaceXSI's standard text, folded away below.
Compared with SpaceXSI's other open jobs.
The team: Engineering HIRES STEADILY
This role is one of 26 open in Engineering. 4 were posted in the last 30 days and the oldest in April: a team that hires all year rather than one being built.
WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS
Python (13 of 26), Rust (11 of 26), C++ (9 of 26), Networking (7 of 26), Golang (6 of 26), Java (6 of 26), Machine Learning (6 of 26)
OTHER ROLES ON THIS TEAM
- Senior Product Manager, Commerce Platform posted Oct 27
- Spring 2027 Software Engineering Internship/Co-op posted Oct 2
- Summer 2027 Software Engineering Internship/Co-op posted Oct 2
- Network Engineer posted Sep 14
- Network Engineer posted Sep 14
- Analytics Engineer - X posted Aug 12
- Software Engineer - Search Infrastructure posted Aug 6
- Software Engineer - X Developer Platform posted Aug 5
- Software Engineer - Linux Kernel (C++, C) posted Aug 3
- Software Engineer - Evals posted Jul 22
- ML Infrastructure Engineer posted Jul 22
- Software Engineer - Platform Infrastructure (Rust, C++) posted Jul 20
- Software Engineer - Network Software and Services posted Jul 15
- Software Engineer - X Data Engineering posted Jul 12
- Software Engineer, Network (C++) posted Jul 2
- Network Operations Technician (Starlink) posted Jun 19
- Software Engineer, Ads Product posted Jun 2
- Software Engineer, Imagine Safety posted May 31
- Sr. Maching Learning Engineer, Search Ranking posted Apr 30
- Backend Engineer, API posted Apr 24
- Software Engineer, Consumer Subscriptions posted Apr 16
- Software Engineer (X Money) posted Apr 14
- Machine Learning Engineer, Ads posted Dec 3
- Software Engineer, Networking Software and Services posted Oct 15
- Machine Learning Engineer, Recommendation Systems posted Apr 11
From the team and dates on SpaceXSI's own job board.
See Software Engineer salaries in the United States →
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