Character.AI

www.character.ai

1 Job

209 Employees

About the Company

Character is one of the world's leading personal AI platforms. Founded in 2021 by AI pioneers Noam Shazeer and Daniel De Freitas, Character is a full-stack AI company with a globally scaled direct-to-consumer platform.

Listed Jobs

Company Name: Character.AI
Job Title: Research Engineer, ML Systems (All Industry Levels)
Job Description: Job Title: Research Engineer, ML Systems Role Summary: Develop ML systems and infrastructure for AI-enabled products, optimizing GPU cluster performance and efficiency, and advancing large language model (LLM) training, inference, and deployment to support high-throughput applications. Expectations: All industry experience levels considered for candidates with PhD-equivalent research expertise and a proven record in machine learning research or systems development. Key Responsibilities: - Design, implement, and optimize ML training and inference systems for GPU clusters. - Develop high-performance kernels (e.g., Triton) and hardware-specific optimizations. - Architect scalable systems for training/distilling LLMs to balance latency, accuracy, and engagement. - Build distributed RLHF pipelines and multimodal (image/video generation) model infrastructure. - Improve inference efficiency through algorithms like prefix-aware caching and system architecture. Required Skills: - Proficiency in PyTorch for model development and optimization. - Expertise in ML techniques (transformers, reinforcement learning, LLMs). - Strong software engineering and system-level coding for production environments. Required Education & Certifications: PhD or equivalent research experience in machine learning, computer science, or related fields with a demonstrable impact on ML systems innovation.

San francisco bay, United states

Hybrid

13-12-2025