Xai
Member of Technical Staff - Post-Training and RL
Palo Alto, CA
Apply through hirly
hirly scores this role against your resume, shows its reasoning, then writes a resume and cover letter for it and fills the application with you. Free to start — no card required.
hirly's read of this role
- Seniority
- Lead / management
- Stated salary
- $180,000 – $600,000 per year
- Country
- US
- Work mode
- On-site / unstated
- First seen by hirly
- 13 Sept 2026
Derived automatically from the posting. Sign up to see how the role scores against your own resume.
the posting
SpaceXAI’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 employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.
ABOUT THE ROLE:
You will work on the most critical post-training and reinforcement learning challenges at any given time — including reward modeling, preference optimization (RLHF/DPO), and RL for improving reasoning, truthfulness, and real-world capabilities.
You will get clarity on your first project before an offer.
BASIC QUALIFICATIONS:
You believe truth-seeking AI is the most important and challenging problem.
You are obsessed about building incredibly useful models through post-training and RL techniques.
You are a power user of AI models and eager to push the boundaries of what’s possible with reinforcement learning and alignment methods.
If you previously worked on post-training, RLHF, or trained models used by millions of people it’s a big plus, but relevant experience is not required.
You take pride in your work and thrive in meritocratic environments.
COMPENSATION AND BENEFITS:
$180,000 - $600,000 USD
Base salary is just one part of our total rewards package at SpaceXAI, 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.
SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice .
Is this role actually a fit for you?
hirly answers with a score and its reasoning, then writes the resume and cover letter if you decide to go for it.
Score it against my resume