# Senior Data Scientist - Recommendation Systems Pod

> Salla · Makkah, Saudi Arabia (Remote) · — · Posted 2026-06-23

**Workplace:** remote

**Department:** AI and Data Analytics

## Description

Join us in building the intelligence that powers product discovery for millions of shoppers and thousands of merchants across the Middle East. As a Senior Data Scientist for the Recommendation Systems Pod, you'll lead the design and execution of large-scale personalization models that directly impact the company topline.

This is a rare opportunity to shape the next generation of commerce AI in a high-growth market characterized by highly diverse user and merchant behaviors across the GCC.

**Responsibilities**

-   Design, train, and deploy recommendations/personalization models leveraging deep learning, sequence models (Transformers, GRU), and boosted trees (XGBoost, LightGBM).
-   Develop multi-objective ranking that blends engagement, conversion, and merchant value into a single ranking score (value model), using multi-task learning where shared representations help.
-   Build scalable two-stage retrieval and ranking systems — ANN retrieval (FAISS, ScaNN) over user/product/event embeddings feeding learning-to-rank models (pointwise, pairwise, and listwise objectives).
-   Collaborate with infra to productionize real-time feature pipelines (ClickHouse, Kafka, Spark).
-   Define serving-time impression and feature logging to eliminate training-serving skew and produce unbiased training data.
-   Design and run online experiments with rigorous guardrail metrics; correct for position and presentation bias in logged data; apply counterfactual/off-policy evaluation and uplift modeling to attribute lift accurately.
-   Integrate model outputs with platform APIs for dynamic personalization in search, home feeds, and store pages.
-   Define best practices for offline evaluation (MAP@K, NDCG) and online experimentation metrics (CTR, CVR, GMV uplift).
-   Partner with product analytics and data science to iterate on signal enrichment and cold-start strategies.
-   Mentor junior data scientists and define best practices.

## Requirements

-   Bachelor's or Master's degree in Computer Science, Machine Learning, or a related technical field.
-   4+ years of hands-on ML experience, including 2+ years designing or deploying large-scale recommendation systems.
-   Track record: Built or maintained systems serving 1M+ users or generating 100M+ personalized predictions daily.
-   Deep expertise in representation learning, embeddings, attention mechanisms, and multi-task learning.
-   Demonstrated success integrating multi-stage ranking systems across e-commerce surfaces (search, feeds, product detail pages) with measurable online lift (CVR, GMV).
-   Proficient with large-scale data ecosystems: Kafka, Spark, ClickHouse, BigQuery, or equivalent.
-   Strong command of experimentation rigor: guardrail metrics, position-bias correction, off-policy/counterfactual evaluation, and model monitoring.
-   Skilled in debugging, optimization, and productionization of ML pipelines in cloud or containerized environments.

## Apply

[Apply at Salla](https://apply.workable.com/salla/j/5ECA464729/apply)

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