Machine Learning Infrastructure Engineer

Character.AI · Posted Apr 24, 2025 · Checked open Oct 3, 2026

17 certified LCAs (H-1B, H-1B1, E-3) in FY2025 and FY2026 to June 30, 2026, median wage $260,000 · Character Technologies Inc. on EarthOnline Visa

Location
Redwood City, CA
Workplace
Hybrid
Salary
$150K – $350K a year · as the company’s job board gives it
Team
Technical Staff - ML
Type
Full-time

Apply on Character.AI’s site

About the role

We’re looking for seasoned ML Infrastructure engineers with experience designing, building and maintaining training and serving infrastructure for ML research.

Responsibilities:

Provide infrastructure support to our ML research and product

Build tooling to diagnose cluster issues and hardware failures

Monitor deployments, manage experiments, and generally support our research

Maximize GPU allocation and utilization for both serving and training

Requirements:

4+ years of experience supporting the infrastructure within an ML environment

Experience in developing tools used to diagnose ML infrastructure problems and failures

Experience with cloud platforms (e.g., Compute Engine, Kubernetes, Cloud Storage)

Experience working with GPUs

Nice to have

Experience with large GPU clusters and high-performance computing/networking

Experience with supporting large language model training

Experience with ML frameworks like Pytorch/TensorFlow/JAX

Experience with GPU kernel development

About Character.AI

Character.AI empowers people to connect, learn and tell stories through interactive entertainment. Over 20 million people visit Character.AI every month, using our technology to supercharge their creativity and imagination. Our platform lets users engage with tens of millions of characters, enjoy unlimited conversations, and embark on infinite adventures.

In just two years, we achieved unicorn status and were honored as Google Play's AI App of the Year—a testament to our innovative technology and visionary approach.

Join us and be a part of establishing this new entertainment paradigm while shaping the future of Consumer AI!

At Character, we value diversity and welcome applicants from all backgrounds. As an equal opportunity employer, we firmly uphold a non-discrimination policy based on race, religion, national origin, gender, sexual orientation, age, veteran status, or disability. Your unique perspectives are vital to our success.

From Character.AI’s job board on Ashby. About this data