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Principal Research Engineer, Post-Training
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Character.AI·Redwood City, CA·22 июня

Principal Research Engineer, Post-Training

🏢 ОфисLeadПолная занятость
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Наша компания

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.

Чем предстоит заниматься

Technical Leadership & Mentorship: Define and drive the technical roadmap for mid- and post-training systems, balancing research innovation with production reliability and scalability. You will mentor and grow a team of researchers and engineers through technical guidance, design reviews, and career development. Establish best practices for experimentation, model development, and deployment
Research & Model Development: Lead the development of alignment algorithms, optimization techniques, and training objectives to improve model capabilities and data efficiency. Drive advances in mid- and post-training methodologies including reinforcement learning, preference optimization, supervised fine-tuning, and emerging alignment approaches. Identify and execute high-impact research opportunities that improve model behavior, safety, and user engagement. Develop robust evaluation frameworks and quality signals to measure real-world model performance
Systems & Infrastructure: Lead the design of efficient training and inference systems for large-scale generative models. Architect scalable data pipelines that transform diverse data sources into high-quality training datasets. Partner with infrastructure teams to optimize distributed training, GPU utilization, and serving efficiency. Drive improvements in experimentation platforms, data quality systems, and model observability

Наши требования

PhD in Computer Science, Machine Learning, AI, or a related field, or equivalent industry experience
Significant experience leading technical projects or teams in machine learning, AI research, or large-scale distributed systems. Experience scaling and mentoring high-performing research and engineering teams
Deep understanding of modern machine learning techniques, including transformers, reinforcement learning, alignment methods, and large language models
Strong track record of delivering impactful research or applied ML systems in production environments
Expertise in designing, building, and maintaining production-quality ML systems and infrastructure
Experience training, serving, debugging, and optimizing large-scale models on GPU-based systems
Experience leading teams working on large language model training, mid-training, or post-training
Experience with product experimentation, online evaluation, and A/B testing frameworks
Strong software engineering skills with the ability to write clean, maintainable, and scalable code
Excellent communication skills and the ability to influence technical direction across teams. Lead complex, cross-functional initiatives across data, training infrastructure, evaluation, and model serving
Hands-on experience working directly with open-source models like Mistral and Qwen, particularly adapting them via mid- and post-training for specific personas, creative writing, or role-playing applications
Familiarity with cloud-native ML infrastructure, including Kubernetes, Docker, and modern orchestration platforms
Publications in leading machine learning conferences or demonstrated contributions to the broader AI community
C
Character.AI
Redwood City, CA

ГрейдLead
ЗанятостьПолная занятость
РегионРоссия
ФорматОфис
ИсточникСкрыто
Опубликовано22 июня
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