Ujjwal Raj

About Ujjwal Raj

I am an IIT Kharagpur graduate and currently an Data Scientist at Zomato, where I build machine learning systems that impact over 50M users. My expertise spans personalization, recommender systems, contextual bandits, and causal inference, with proven results in boosting ROI, engagement, and retention. I have hands-on experience with Python, SQL, PySpark, Databricks, and ML-Ops, along with a strong track record of Experimentation and deploying large-scale ML solutions into production.Beyond the technical side, I’m driven by curiosity and a problem-solving mindset. I thrive on tackling complex, real-world challenges, whether it’s optimizing marketing spends, personalizing user journeys, or automating pipelines with LLMs. Colleagues know me as the go-to person when something difficult needs to be solved — someone who combines analytical thinking with leadership to deliver measurable business impact.

Experience

1. Data Scientist

   Zomato

   Jan 2026 — Present · Gurugram, IN

   Designed and deployed a restaurant ad-serving system using a two-stage candidate generation + ranking architecture (XGBoost-based pCTR/pCVR), improving ad relevance and conversion for 20M users• Built restaurant clustering pipeline for candidate generation, reducing retrieval latency and improving ranking efficiency.

Education

• Indian Institute of Technology, Kharagpur

  Dual Degree, Metallurgical and Materials Engineering

• JVM Shyamali

  10+2, Science

• Jawahar Vidya Mandir Shyamali

  High School Diploma

• DAV Schools Network

  10th