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xAI · 3 hours ago

Member of Technical Staff - Macrohard

Palo Alto, CA

Full-time

Onsite

Mid, Senior Level

$180K/yr - $440K/yr

xAI is on a mission to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. The role involves building intelligent agents that surpass human performance on computers by managing the entire agent lifecycle, from designing model architectures to pre-training foundation models.

Artificial Intelligence (AI)Foundational AIGenerative AIInformation TechnologyMachine Learning

Growth Opportunities

H1B Sponsor Likely

Responsibilities

Designing novel model architectures

Curating high-quality interaction data and iterating on the data flywheel

Pre-training foundation models

Designing and ablating data studies at different stages of training – Pre-training, Mid-training, RL and post-training

Build and iterate on high quality representative evals

Qualification

Multimodal foundation modelsData recipes for trainingInfrastructureFrameworksReinforcement learning techniquesCleanEfficient codePrioritization skillsCommunication skillsWork ethic

Required

Exceptional engineers who own work end-to-end and thrive in meritocratic environments

Obsessed with quality, rigor, and first-principles thinking

Write clean, efficient code

Run tight experiments

Hold yourself (and your teammates) to the highest standards

Deep expertise or hands-on experience in one or more of the following areas:

Pushing the boundaries of multimodal foundation models (vision + language + action) for computer use

Crafting pre-training and mid-training data recipes — especially for multimodal and agentic data — turning raw interaction traces, synthetic data, and web-scale corpora into high-signal flywheels that unlock breakthrough capabilities

Building robust infrastructure and frameworks that power the full agent lifecycle: scalable data pipelines, distributed training systems, eval harnesses, and monitoring tools

Applying RL techniques — including online/offline RL, reward modeling, and post-training recipes — to train agents that generalize across complex, long-horizon computer-use tasks reliably

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.

Founded in 2023

Palo Alto, California, USA

1001-5000 employees

https://x.ai

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 Stage

Total Funding

$42.73B

Key Investors

Neptune Digital AssetsSpaceXMorgan Stanley

2026-01-06Series E· $20B

2025-12-11Secondary Market· $0.3M

2025-07-13Corporate Round· $5.32B

Leadership Team

Greg Yang

Co-Founder

Yuhuai Wu

Co-Founder

Recent News

IndiaTimes

Elon Musk says xAI is bringing changes to ‘For You’ tab on X: Here’s what’s new

2026-01-25

The Cool Down

New report uncovers disturbing findings about millions of photos generated by Elon Musk's chatbot: 'This is industrial-scale abuse'

2026-01-25

Tech Xplore

Grok created three million sexualized images, research says

2026-01-24

Company data provided by crunchbase