xAI · 6 days ago
Member of Technical Staff - Reasoning Post-training
Palo Alto, CA
Full-time
Hybrid
Mid, Senior Level
$180K/yr - $440K/yr
3+ years expxAI is dedicated to creating AI systems that enhance humanity's understanding of the universe. The Member of Technical Staff - Reasoning Post-training will focus on optimizing AI models' reasoning capabilities through innovative post-training methods, driving creative problem-solving and collaboration across teams to enhance model intelligence.
Artificial Intelligence (AI)Foundational AIGenerative AIInformation TechnologyMachine Learning
Responsibilities
Apply and innovate on post-training methods like fine-tuning, reinforcement learning variants, or data augmentation to sharpen reasoning skills, ensuring models deliver more accurate, coherent, and insightful outputs
Invent novel strategies for enhancing reasoning, such as custom prompting frameworks, synthetic reasoning datasets, or hybrid techniques that push the limits of model cognition through out-of-the-box thinking
Tackle broad reasoning challenges creatively, from debugging logical inconsistencies to engineering solutions for edge-case scenarios, using iterative experimentation to uncover hidden potential in models
Develop creative benchmarks and metrics to assess post-training impacts on reasoning, enabling rapid cycles of refinement that align with evolving user needs and technological frontiers
Partner with diverse teams to integrate post-training advancements into our AI ecosystem, leveraging your creativity to inspire cross-pollination of ideas and accelerate overall model intelligence
Qualification
Required
Extensive hands-on experience with post-training techniques (e.g., RLHF, DPO, or alignment methods) focused on reasoning improvements, with a portfolio of successful model enhancements
Demonstrated ingenuity in solving ambiguous AI challenges, evidenced by innovative projects, contributions, or unconventional approaches that yielded breakthroughs
Proficiency in engineering tools (e.g., Python, PyTorch) and a solid grasp of model architectures, enabling you to navigate wide-ranging tasks from ideation to deployment
Background in AI development with emphasis on reasoning, logic, or cognitive science, including publications or experiments that highlight creative applications in post-training contexts
3+ years in multifaceted AI roles at cutting-edge organizations, where you've thrived in broad scopes by balancing creativity with rigorous execution to deliver high-impact results
Strong communication skills
Strong prioritization skills
Work ethic
Benefits
Equity
Comprehensive medical, vision, and dental coverage
Access to a 401(k) retirement plan
Short & long-term disability insurance
Life insurance
Various other discounts and perks
Company
xAI
XAI is an artificial intelligence startup that develops AI solutions and tools to enhance reasoning and search capabilities.
1001-5000 employees
H1B Sponsorship
xAI has a track record of offering H1B sponsorships. Please note that this does not
guarantee sponsorship for this specific role. Below presents additional info for your
reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (1)
Funding
Current Stage
Late StageTotal Funding
$42.73BKey Investors
Valor Equity PartnersNeptune Digital AssetsSpaceX
2026-02-02Acquired
2026-01-06Series E
2026-01-06Series E· $20B
Leadership Team
Greg Yang
Co-Founder
Yuhuai Wu
Co-Founder
Recent News
2026-02-08
Company data provided by crunchbase