ML Research Engineer – LLMs for Wellbeing & Impact

Flagship Pioneering, Inc.; Cambridge (MA); On-site; USD 120,000 - 193,000; Full time

Job summary

Flagship Pioneering, Inc. seeks a Machine Learning Research Engineer to innovate, develop and apply ML methods for psychological wellbeing.

You will work with world-class scientists and engineers on cutting-edge AI research and applications, shaping the next frontier of human-AI interaction. The role emphasizes reinforcement learning from human feedback, supervised fine tuning, and scalable ML pipelines using state-of-the-art models, with a focus on practical wellbeing tools.

Qualifications

• Masters level (or above) in CS, ML or AI preferred.
• Strong foundation in ML, DL and NLP.
• Publications at top ML/NLP venues are a bonus.

Responsibilities

• Design, develop, and deploy ML-powered applications leveraging LLMs.
• Collaborate with psychological experts to translate insights into computational frameworks.
• Advance state-of-the-art in context engineering, agentic AI, and learning from human feedback.
• Build scalable data collection, labeling, training, and deployment pipelines for LLM-based systems.
• Support integration of ML systems into real-world applications with measurable outcomes.
• Communicate findings to a multi-disciplinary audience.

Skills

Machine learning

Reinforcement learning

NLP

Python

Communication

Independent work

Publications

Education

Masters degree in CS/ML/AI

Tools

PyTorch

vLLM

LangGraph

Job description

Flagship Pioneering, Inc. seeks a Machine Learning Research Engineer to innovate, develop and apply ML methods for psychological wellbeing.

You will work with world-class scientists and engineers on cutting-edge AI research and applications, shaping the next frontier of human-AI interaction. The role emphasizes reinforcement learning from human feedback, supervised fine tuning, and scalable ML pipelines using state-of-the-art models, with a focus on practical wellbeing tools.