Job Details

AI/Machine Learning Engineer

Citizen Health is building a personalized AI‑powered advocate that leverages patients' complete medical histories and data from thousands of other patients to generate insights for clinical decisions and everyday challenges. By combining data, AI and community, we aim to enable biopharma and researchers with seamless access to real‑world data, shaving years off drug development for rare and complex conditions.

Who We Are

Citizen Health was founded on the belief that having the right advocate is the single most important factor in achieving better care and outcomes. Our mission‑driven team, backed by investors such as 8VC, Transformation Capital and Headline Ventures, is building the future of consumer healthcare.

The Role

We are seeking AI/Machine Learning Engineers to lead the development and deployment of cutting‑edge AI solutions that power our patient‑centric platform. As a key technical leader you will design and implement sophisticated machine learning models that transform complex health data into actionable insights for patients, healthcare providers and researchers.

Responsibilities

• Design and implement end‑to‑end machine learning solutions, from data preprocessing to model deployment and monitoring.
• Develop and optimize LLM solutions for healthcare applications using fine‑tuning and Retrieval‑Augmented Generation (RAG).
• Create robust data pipelines for validation and deployment.
• Implement ML systems that process and analyze diverse healthcare data types, including structured clinical data, medical imaging and unstructured text.
• Collaborate with backend engineers to integrate ML models into production infrastructure.
• Ensure ML systems meet strict healthcare compliance requirements while maintaining high performance.
• Design and implement monitoring systems for model performance, data drift and system health.
• Lead research initiatives to explore and implement state‑of‑the‑art AI/ML techniques.
• Collaborate with clinical experts to validate model outputs and ensure medical accuracy.
• Stay current with the latest developments in AI/ML, particularly in healthcare applications.

Who You Are

You are a builder and problem solver at heart who loves working in fast‑paced, innovative environments. You have experience in consumer technology companies and have worked on products that handle complex data and systems. You thrive in startup settings and operate autonomously while collaborating effectively.

Must‑Have Skills

• 5+ years of experience in machine learning engineering with a focus on production ML systems.
• Strong proficiency in Python and AI/LLM frameworks such as LangChain, LangGraph, AutoGen, CrewAI.
• Experience designing and implementing production‑grade ML pipelines.
• Proven track record of deploying ML/LLM solutions in production environments.
• Strong understanding of ML fundamentals, including deep learning, NLP and statistical modeling.
• Experience with ML Ops tools and best practices.
• Proficiency in working with large‑scale datasets and distributed computing.
• Strong software engineering skills and coding best practices.
• Degree in Computer Science or equivalent.

Preferred Skills

• Hands‑on experience integrating and optimizing LLMs in production environments.
• Proficiency with LLM tools and techniques such as LangChain, LlamaIndex and Prompt Engineering.
• Experience implementing Retrieval‑Augmented Generation (RAG) systems.
• Familiarity with vector databases and efficient similarity search techniques for AI applications.
• Experience with messaging queue systems and data streaming platforms.
• Familiarity with data processing and analytics technologies.
• Proven track record of high‑quality coding and architectural design.
• Passion for creating robust, scalable, AI‑driven systems that make a real‑world impact in healthcare.

Why Join Us?

• Work on pioneering AI technologies and solve complex problems that push the boundaries of healthcare.
• Freedom to lead projects and shape the company's direction in a mission‑driven environment.
• Fast‑paced, high‑growth setting with clear career progression opportunities.
• Supportive culture that encourages learning, experimentation, and innovation.
• Commitment to empathy and diversity, recognizing the strength of varied perspectives.
• Regular team activities and knowledge sharing in a culture that prioritizes well‑being and connection.

Additional Perks

• Competitive salary + equity package.
• Comprehensive health, dental, and vision insurance.
• Unlimited paid time off, including generous parental leave.
• Flexible hybrid work environment.

Commitment to Diversity & Inclusion

Citizen Health is proud to be an equal‑opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. Everyone deserves an equal chance to contribute and grow here regardless of race, gender identity, sexual orientation, religion, national origin, age, disability or veteran status.

Our compensation range for this role is $150K – $300K.

Job Details

Location: San Francisco, CA
Seniority level: Mid‑Senior level
Employment type: Full‑time
Industry: Technology, Information and Internet