Senior Data Scientist

About The Position

As a Senior Data Scientist for personalization, you will own the science behind the recommendation engine that powers each user’s personalized product feed. Starting from our user-saved product signals and a live catalog ingested from thousands of retailer feeds, you will design, build, evaluate, and continuously improve the models that learn each user’s taste across brand, category, color, price point, and fit.

This is a hands‑on, full‑cycle role. You will take a recommendation problem from raw data all the way to a production model running on our existing MLOps stack — you own the model layer, not the infrastructure. Our platform team already operates the feature store, serving, and autoscaling; your job is to decide what to model, prove it works through rigorous offline and online experimentation, ship it, and iterate as behavioral signals accumulate.

A defining challenge of this role is cold‑start. We are launching with a small behavioral dataset and a catalog scaling from hundreds of thousands of products toward tens of millions. You will need strong commerce and product‑data intuition to produce high‑quality recommendations before rich click data exists — and the experimental discipline to keep improving them as it arrives. This is a foundational hire that will shape how millions of users discover products they love.

This position offers remote work flexibility; however, if you reside within a commutable distance our offices in New York, the expectation is to work from the office three days per week.

Our next‑generation product discovery platform connects shoppers with the things they love across thousands of retail partners. Users save, organize, and share products they’re excited about — and our platform turns those signals into a deeply personalized shopping experience. We ingest live product feeds from thousands of retailers and use a rich understanding of each user’s taste to surface the right product at the right moment.

We’re building the recommendation engine at the heart of this shopping experience — a system that understands not just what people save, but why they save it. This is a foundational hire that will shape how millions of users discover products they love.

• 35% Recommendation & Personalization Modeling:
  Own the design and development of the core recommendation models that turn user‑saved product data into a personalized feed. Develop multi‑signal models spanning brand affinity, category, color/visual attributes, fit and sizing, price sensitivity, and trend. Select and justify approaches across collaborative filtering, matrix factorization, content‑based, and hybrid/neural methods (e.g., two‑tower and other embedding models), and know when each applies. Build product and user embeddings that capture semantic similarity across the catalog and power candidate generation and retrieval.
  
  Design cold‑start strategies that produce high‑quality recommendations for new users and newly ingested products with little or no behavioral history.
• 25% Experimentation & Measurement:
  Define what “good” personalization means and how it is measured. Establish rigorous offline evaluation (ranking and relevance metrics, sound holdout design) and connect it to online outcomes. Design, run, and read out A/B and multivariate experiments, and translate results into clear product and business decisions. Bring statistical discipline — sound experiment design, awareness of bias and confounding, and honest interpretation — so the team can trust which changes actually move engagement.
• 20% Data, Signals & Feature Understanding:
  Develop deep intuition for Picksy’s product catalog and user signals.…