Senior Data Scientist

About Probably Genetic

Probably Genetic is changing the lives of patients living with severe, complex diseases. Our data platform is used by drug developers and patient advocacy groups to develop and launch treatments for these patients. Our technology discovers undiagnosed patients online, analyzes their disease state using machine learning and at-home testing, and enables compliant communication with patients. In doing so, we help patients access diagnoses, clinical trials, and treatments as early as possible.

We are a tight-knit group of hard-working, ambitious problem solvers united by a mission greater than ourselves. We do well by doing right by patients. We are developing some of the most cutting-edge solutions in healthcare, and our roadmap is packed with innovations in bioinformatics, AI, and drug development. We have built a lean, all-star team to help us bring our vision to life, and we want you to be a part of it.

Probably Genetic has raised multiple rounds of funding from Silicon Valley’s best investors, including Threshold, Khosla, and Y Combinator, and offer competitive salaries, comprehensive benefits, and meaningful early stage equity.

About the role

We are looking for a Senior Data Scientist who will own some of the most consequential diagnostic AI in rare disease: building, validating, and operationalizing the models that help us find and diagnose patients who have never had a name for their disease, powering the analytical rigor behind our testing programs, and shaping how we use data to make smarter product decisions.

What you will do

Own the end-to-end development, validation, and operationalization of PG's predictive diagnostic AI models — from feature engineering through production deployment – that power program eligibility decisions and clinical decisions for patients

Run prospective testing experiments: apply diagnostic models to undiagnosed patients, coordinate testing, and track outcomes to continuously improve model performance

Build and maintain PG's synthetic patient data pipeline, a critical deliverable for our research programs, and key input to our own model development lifecycle

Optimize our patient intake experience using NLP and multimodal data analysis to determine which questions to ask, in what order, to maximize data quality and conversion

Own API usage and cost optimization across PG's AI stack, including prompt engineering, model evaluation, and ongoing performance monitoring

Conduct ad hoc strategic analyses that inform product prioritization, causality assessment, and generate customer-facing program insights

Establish MLOps infrastructure: model monitoring, drift detection, API observability, and lightweight but durable operational processes

Have the freedom to conduct blue sky research initiatives aimed at creating value from our data

Work with Data Engineering to build a robust, scalable data foundation that supports all of the above

Who you are

We are looking for a few specific things that will help you succeed in this role:

7+ years of experience in data science, machine learning engineering, or a closely related field

Strong Python proficiency and fluency across the core data science stack: pandas, NumPy, scikit-learn, PySpark, and SQL

Demonstrated end-to-end ML experience: you have taken models from problem definition through feature engineering, validation, deployment, and monitoring in a production environment

Experience with NLP techniques and applying language models to real-world problems

Comfort with prompt engineering and evaluating external AI API performance (e.g., OpenAI)

A track record of operating with high ownership in lean, fast-moving environments where you have had to build structure as much as execute within it

Strong analytical communication skills — you can translate complex model outputs and data findings into clear, actionable narratives for technical and non-technical audiences alike

Some things that are not required, but you will learn on the job:

Experience with Databricks or similar lakehouse/ML platform environments

Familiarity with synthetic data generation techniques

Domain knowledge in healthcare, rare disease, genomics, or clinical research

Experience with MLOps tooling and building observability infrastructure from scratch

Exposure to biopharma or insurance analytics use cases

As with all new hires at Probably Genetic, you will also need to be:

A good person. We work with some of the most marginalized populations on the planet and empathy is key

Patient-focused and motivated to have a lasting, positive impact on humanity

Comfortable in a fast-paced, often ambiguous environment with rapid change

Action-oriented and excited to build a company from the ground up

The salary range for this role is $180,000-$230,000 annually. Actual compensation offered will depend on several factors including but not limited to: work experience, education, skill level, and/or other business and organizational needs.

What we offer at Probably Genetic:

An engaging and supportive team all on a mission to improve lives

Fair and equitable compensation with competitive early-stage equity grants

Generous Flexible Time off policy, that we actually use

Parental Leave Benefits (12 weeks for both birthing and non-birthing)

Hybrid, flexible work with high-trust and autonomy

A bright, inviting, pet-friendly office in Downtown SF near transit

A “work from anywhere” policy, up to 4 weeks a year

Regular team retreats in exciting destinations

Health Benefits including medical, dental, vision, therapy, FSA, and 401k

And so much more!

Probably Genetic is committed to fostering a welcoming and inclusive work environment for people of all genders, sexuality, ethnicity, socioeconomic background and life experiences. We urge candidates of all backgrounds to apply. If you require specific accommodations as you interview or consider working with us, please let us know.