Senior Data Scientist, Product & Growth

Praxy; San Francisco, Northern (CA, KY); Hybrid; USD 140,000 - 210,000; Full time

Benefits offered by this job

Unlimited PTO

Daily catered lunch and dinner

Equipment budget

Job summary

Comfy is seeking a senior, hands-on product and growth data scientist to own the analysis behind signup, activation, conversion, and retention. You will work directly with growth, product, and the founders to answer critical questions and turn them into decisions.

You will design experiments, build activation and churn models, and turn messy events into clean analysis using PostHog and a data warehouse. This is a senior IC role with high ownership and impact.

Qualifications

• Hands-on data scientist with product/growth focus.
• Proficient in SQL and Python for analytics and modeling.
• Strong experience designing and interpreting experiments and A/B tests.

Responsibilities

• Own growth funnel metrics: signup, activation, conversion, retention.
• Design and run experiments to measure impact and learnings.
• Build models for activation, churn, retention, conversion, and LTV.
• Translate events into trusted analysis and dashboards.
• Collaborate with growth, product, and founders to drive bets.

Skills

SQL

Python

Experimentation

A/B testing

Data modeling

Tools

PostHog

dbt

Data warehouse

Job description

Comfy is looking for our first dedicated product and growth data scientist. Millions of people use ComfyUI, and we're turning that reach into a real business. We need someone who can tell us what's actually happening inside the funnel, find where the leverage is, and prove what moves the numbers.

This is a hands-on, senior IC role. You'll own the analysis behind signup, activation, conversion, and retention, and you'll work directly with growth, product, and the founders. You won't sit behind a ticket queue. You'll pick the questions that matter, answer them well, and turn the answers into decisions we actually make.

What You'll Do

• Own the metrics that define our growth funnel: signup, activation, conversion, retention, and how they connect
• Design and run experiments (A/B tests and beyond), and read them honestly, including when the answer is "no effect"
• Build the models that matter for growth: activation prediction, churn and retention, conversion propensity, and LTV
• Turn messy product and billing events into clean, trusted analysis (we run on PostHog and a warehouse)
• Find the leverage: the few places where a small change in the funnel produces an outsized result, and size the opportunity before we build
• Make your work legible with clear metrics, dashboards, and writeups the whole team can act on
• Partner with growth and product day to day, and with the founders on the bets that matter

You Might Be a Fit If You

• Have several years in product or growth data science, ideally at a product-led or consumer company with real scale
• Are genuinely hands-on: you write your own SQL and Python, build your own models, and don't need a platform team to get answers
• Know experimentation cold, both the statistics and the judgment, and can tell a real effect from noise
• Think in funnels and systems, and connect a metric to the decision it should drive
• Communicate in plain language, and aren't afraid to deliver an inconvenient finding
• Have built data models or pipelines when the job needed it (dbt, warehouse), even if analysis is your main game
• Care about AI and creative tools, ideally as a ComfyUI user
• Like a small, intense team: high ownership, low ego, fast clock
• Are in SF or ready to be

Bonus Points

• You've stood up an experimentation program or an analytics stack from scratch
• You're comfortable with PostHog, dbt, or similar tools
• You can point to analysis that changed what a company did, not just what it knew

Benefits include company-sponsored Medical, Dental, and Vision (up to 100% coverage), unlimited PTO, daily catered lunch and dinner, your choice of equipment, and an unlimited budget for AI tools.

About ComfyUI

The creative world is changing fast. Everything that used to be rendered is being generated by AI. ComfyUI https://www.comfy.org/ is the world's leading visual AI platform, an open, modular system to build AI workflows.

It's used by artists, filmmakers, video game creators, designers, researchers, VFX houses, and among others, teams at OpenAI, Netflix, Amazon Studios, Ubisoft, EA, and Tencent, all who want to go beyond presets and truly shape how AI creates.

Open-source, with over 100k GitHub Stars

An inference engine to run the most powerful open source models locally or in the cloud

A massive community, with thousands of community-made nodes and integrations

Scales from creative experimentation to production automation

Evolving to democratize visual AI creation, empowering everyone from hobbyists to studios, storytellers, and enterprises to be more productive and creative than ever before

ComfyUI isn't just another AI app. It is the operating system for visual generative AI, the foundation on which the next generation of creative tools are built.