Senior Full-Stack Data Scientist - Client Experience Algorithms (multiple roles)

Stitch Fix is redefining retail by blending the art of fashion with the science of machine learning. Throughout the company's history, the Algorithms Organization has been a key source of our innovation and competitive differentiation.
The Client Experience Algorithms team builds the tools that power personal style, combining best-in-class models with expert human judgment. We foster a culture of ownership where Data Scientists manage the full lifecycle of their work, from research to model deployment. You’ll use multidisciplinary tools to solve complex problems in a data-rich environment, directly influencing how millions of clients discover what they love.

Client Experience Algorithms includes multiple sub-teams, two of which are hiring Senior Data Scientists. In applying, you may be considered for one or more roles with the Styling, Growth, and Recommendation Algorithms teams, which will each have a direct impact on our business’ bottom line. 

The Styling Algorithms team sits directly at the interface between our technology and models, and our team of over 1500 highly-engaged stylists. We use frontier AI and industry-leading ML models to enable our front-line employees to do the right tasks, surface the right merchandise, and communicate effectively with our two million active clients. 

The Styling Algorithms role is primarily focused on the recommendation and search engines that power our styling interface. While you will collaborate closely with the Foundational Models team (who build our base embeddings), you will own the ranking logic, business logic, and deployment of our inventory surfacing models into production. You will also prototype and deploy agentic AI workflows to assist stylists in real-time.

The Growth Algorithms team is responsible for optimizing our end-to-end acquisition and retention programs, from marketing to onboarding to promotions. We leverage our rich engagement and style data to build personalization models that guide each client through their style journey with Stitch Fix over time.

The Growth Algorithms role is primarily focused on improving our owned channel personalization to deepen client engagement with our products. You will own the technical strategy that unifies the client experience across surfaces, architecting and building machine learning models that surface personalized inventory and context-aware action recommendations via email, push notifications, site experiences, and beyond. 

The Recommendation Algorithms role will contribute to building the future of personalized apparel shopping by thoughtfully combining algorithms with product innovation. A key area of focus is the continued improvement of the quality of recommended assortments along various dimensions, including seasonality, diversity, and freshness. A secondary area is the ability to deliver high-quality recommendations in real time to engage and delight new clients and therefore expand our total addressable market.

• You will be a primary technical owner of our human-in-the-loop augmented recommendations.
• You will work in a team that embraces both LLMs and traditional ML.
• You will manage experiments to test new features, including communication of results to stakeholders and leadership.
• You will solve problems related to recommendation ranking, hyperparameter optimization, and assortment generation. 
• You can leverage a decade's worth of rich and unique data about our clients, our merchandise, and their interactions.
• You will work with our product, product design, and engineering teams to create roadmaps for developing new client products, user features, and infrastructure. 

• You have 3+ years of real-world experience in leveraging Data Science to develop customer-oriented solutions with a recent focus on Recommendation Systems and Search
• You understand the nuances of A/B testing and can balance algorithmic metrics with business metrics.
• You are fluent in SQL and have experience handling large-scale datasets.
• You are proficient in building and deploying apps using the Python data ecosystem.
• You have a degree in a quantitative field such as Computer Science, Statistics, Physics, Mathematics, or a related field.
• You have strong communication skills with business partners.
• You are a team player who sees your growth and success intertwined with the growth and success of your peers.
• You are inspired to take on new challenges and do not shy away from failure.

• We are a group of bright, kind people who are motivated by challenge. We value integrity, innovation and trust. You’ll bring these characteristics to life in everything you do at Stitch Fix.
• We cultivate a community of diverse perspectives— all voices are heard and valued.
• We are an innovative company and leverage our strengths in fashion and tech to disrupt the future of retail. 
• We win as a team, commit to our work, and celebrate grit together because we value strong relationships.
• We boldly create the future while keeping equity and sustainability at the center of all that we do. 
• We are the owners of our work and are energized by solving problems through a growth mindset lens. We think broadly and creatively through every situation to create meaningful impact.
• We offer comprehensive compensation packages and inclusive health and wellness benefits.