Principal / Sr. Principal ML Scientist (Causal Inference, Reinforcement Learning, Ranking & Bid Optimization)
Role Overview
We are looking for a Principal / Sr. Principal Applied ML Scientist to lead the development of next-generation machine learning systems powering recommendations, search, ads ranking, and monetization platforms at scale. This is a high-impact Individual Contributor (IC) role requiring deep expertise in causal inference, unbiased learning systems, reinforcement learning, and large-scale optimization techniques that improve long-term user engagement, relevance, and business outcomes.
The ideal candidate will combine solid hands-on technical depth with cross-functional influence, driving architecture, research direction, and ML best practices across Ads, Recommendations & Personalization, and Search pods.
Key Responsibilities
Lead the design and deployment of advanced ML systems for recommendations, search, and ads monetization at large scale.
Drive research and productionization of applied causal inference techniques for ranking and recommendation systems, including:




Unbiased Learning-to-Rank
Counterfactual/offline evaluation
Incrementality measurement
Position bias estimation and mitigation
Treatment effect modeling
Build and optimize Reinforcement Learning (RL) frameworks for long-term optimization across user engagement, retention, and monetization objectives.
Develop scalable solutions for Cold Start and Long Tail discovery problems using:
Embedding-based retrieval systems
Exploration/exploitation strategies
Catalog-wide optimization
Representation learning techniques
Lead innovations in Ads Ranking and marketplace optimization, including:
Bid optimization
Auction-aware ML systems
Budget pacing
Attribution modeling
Simulation frameworks
Multi-objective optimization balancing revenue, relevance, user experience, and long-term value
Architect robust experimentation and evaluation frameworks for measuring model impact reliably in dynamic environ

📌 Principal Ml Scientist (Bengaluru)
🏢 Nykaa
📍 Bengaluru