Applied Research Scientist, LLM Evaluation & Post-Training

This is a highly collaborative role that sits at the intersection of research, engineering, and language/data operations.

Additional responsibilities include (but are not limited to):

• Define and execute a research agenda focused on LLM evaluation and post-training, especially evaluation-driven model improvement
• Design rigorous experiments to study how evaluation methodologies impact fine-tuning and post-training outcomes
• Develop and validate evaluation frameworks for LLM and multimodal systems, including:
• benchmark/task design
• scoring methods
• judge/model-assisted evaluation
• human evaluation protocols
• robustness/stress testing
• Lead research on advanced evaluation domains, including long-context, cross-modal, and dynamic multi-turn evaluations
• Study the effectiveness and limitations of existing evaluation techniques, and propose improved methodologies with clear validity and scalability tradeoffs
• Analyze model behavior and failure patterns; generate actionable recommendations for model improvement and evaluation redesign
• Collaborate with AI/ML Research Engineers to translate research methods into scalable evaluation and post-training pipelines
• Collaborate with Language Data Scientists to integrate human-in-the-loop and synthetic data/evaluation strategies into research programs
• Engage with customer technical stakeholders to understand evaluation goals, review methodologies, and provide expert recommendations
• Contribute to internal benchmark datasets, evaluation frameworks, and reusable research assets
• Produce high-quality technical documentation, internal research reports, and client-facing materials explaining methods, results, assumptions, and limitations
• Contribute to thought leadership and best practices in LLM evaluation, post-training, and GenAI quality measurement

You’ll Thrive in This Role If You Have:

• MS/PhD in Computer Science, Machine Learning, Statistics, Applied Mathematics, AI, or a related quantitative scientific field (PhD strongly preferred)
• 5+ years of relevant experience in applied research / research science in ML/AI, with substantial work in LLMs or foundation models
• Demonstrated experience with LLM evaluation, benchmarking, alignment, post-training, or model quality research
• Strong foundation in experimental design, statistical analysis, and scientific reasoning for ML systems
• Strong coding skills in Python for research experimentation and analysis (e.g., data processing, evaluation pipelines, statistical analysis, visualization)
• Experience working with modern ML tooling/frameworks (e.g., PyTorch, Hugging Face, JAX/TensorFlow as applicable) sufficient to design and execute model/evaluation experiments
• Ability to evaluate and compare human and automated evaluation methods, including tradeoffs in cost, reliability, validity, and scalability
• Experience designing evaluation studies and protocols that are reproducible across datasets, model versions, and evaluation runs
• Ability to collaborate directly with technical stakeholders including research scientists, ML engineers, data scientists, and customer technical counterparts
• Strong communication skills and ability to present nuanced technical conclusions, assumptions, and limitations clearly

The expected salary range for this position is $175,000 – $225,000 USD per year, based on experience, skills, and qualifications.

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