Senior Data Scientist

$250,000 - $300,000
Full-time / Onsite (5 days/week)

About The Role

We’re a telehealth company helping people lose weight at scale. Experimentation is central to our growth and patient experience—we need to know what truly works, what doesn’t, and why. We’re looking for a Senior Data Scientist who thrives on designing, running, and interpreting experiments across product, pharmacy, and design. You’ll work side-by-side with clinicians, designers, and engineers to push forward a culture of evidence-based decision-making.

This role is ideal for someone who wants to set the standard for how experiments are run at Mochi Health—bringing statistical rigor, practical intuition, and a deep sense of ownership.

What You’ll Do

• Own the design and execution of experiments (A/B tests, quasi-experiments) across pharmacy, design, and product flows

• Partner with design and pharmacy teams to ideate, prioritize, and scope impactful experiments

• Build frameworks and tools to standardize experimentation and causal inference across teams

• Ensure experiment integrity—sample sizing, randomization, stopping rules, multiple-testing corrections

• Move beyond binary “did it win?” to nuanced insights: heterogeneous treatment effects, and trade-offs

• Automate experiment reporting and integrate results into dashboards / internal tools

• Mentor teammates and set best practices for experimentation at the company

Who You Are

• Bachelor’s or Master’s in a quantitative field (e.g., Statistics, Engineering, Economics)

• Bachelor’s, Master’s, or PhD in a quantitative field (e.g., Statistics, Computer Science, Economics)

• 4+ years of industry experience in applied experimentation (growth or product preferred)

• Deep expertise in causal inference methods (A/B testing, DiD, matching, Bayesian methods)

• Strong Python and SQL skills; capable of building reusable frameworks, not just one-off analyses

• Clear communicator who can translate complex experimental results into actionable recommendations

• Comfortable with ambiguity, fast iteration, and working across very different teams (Example: pharmacy, design, ops)

• Motivated by impact - you want your work to directly shape patient care and company growth

Life at Mochi 💫

At Mochi, we believe your best work happens when you feel your best—so we’ve designed an environment that fuels your creativity, supports your growth, and makes every day exciting.

🥗 Daily Meals and Espresso Bar - Breakfast, lunch, and dinner every weekday. Our on-site barista keeps the espresso and matcha flowing all day

💰 Pre-Tax Commuter Perks - Save on transit and parking through pre-tax commuter benefits

💸 Top-of-Market Compensation - We offer competitive salaries along with generous equity packages so you can share in the success you help create

💣 Profitable and Rapid Growth - We’re scaling fast, with financial discipline and long-term vision. No VC constraints, just sustainable momentum and smart decisions

🚀 High-Impact Work - Help shape the future of digital healthcare. Your work here directly improves lives and scales nationwide

👩‍💻 World-Class Team - Collaborate with teammates from Tesla, SpaceX, Citadel, Harvard, IIT, and more. We value excellence, humility, and empathy in equal measure

✨ Comprehensive Benefits - 401(k) with match, generous time off, life insurance, and high-quality medical, dental, and vision plans.

🌴 Time to Recharge –Enjoy unlimited PTO, generous company holidays, and true flexibility. We trust you to take the time you need to rest, reset, and thrive.

🧘 Wellness First –From weekly mindfulness sessions to group workouts and fitness perks, your physical and mental health are top priority

🎉 Team Socials and Community - We make time to connect through regular socials, happy hours, and spontaneous events. Our stocked kitchen doesn’t hurt either

📍 Downtown SF HQ - Our San Francisco office is just steps from BART, Muni, and great food. It’s designed for deep work and casual collaboration

#LI-Onsite

The base salary for this full-time position ranges from $250,000 to $300,000, in addition to equity and benefits. The salary range listed in each job posting represents the minimum and maximum targets for new hire salaries across all locations. Actual compensation within this range is determined by various factors, such as job-related skills, experience, relevant education or training, and location.