Research Engineer, Character.ai

• All Industry Levels": at least PhD (or equivalent) research experience
• Write clear and clean production-facing and training code
• Experience working with GPUs (training, serving, debugging)
• Experience with data pipelines and data infrastructure
• Strong understanding of modern machine learning techniques (reinforcement learning, transformers, etc)
• Track-record of exceptional research or creative applied ML projects

Desirable

• Joining us as a Research Engineer on the Post-Training team, you'll be diving into the exciting world of fine-tuning AI models, optimizing their performance, and ensuring they meet the highest standards of quality and efficiency
• Your work will directly contribute to our groundbreaking advancements in AI, helping shape an era where technology is not just a tool, but a companion in our daily lives
• At Character.AI, your talent, creativity, and expertise will not just be valued—they will be the catalyst for change in an AI-driven future
• The Post-Training team is responsible for developing our powerful pretrained language models into intelligent, engaging, and aligned products
• As a Post-Training Researcher, you will work across teams and our technical stack to improve our model performance and training methods, including data, compute and algorithms
• You will get to shape the conversational experience of millions of users per day
• Develop alignment algorithms and loss functions to improve data sample efficiency
• Write data pipelines to process diverse web data into a format models can ingest
• Identify quality signals to understand our model’s performance in the real world
• Design sampling algorithms to improve serving efficiency of large generative models