Ravindra Kumar

About Ravindra Kumar

Data Scientist with 4.5+ years of experience building large-scale recommender systems and production LLM/RAG platforms. Specialized in retrieval, ranking, and agentic AI systems deployed at scale to improve user engagement and editorial workflows.Contact at:r••••••••@gmail.com

Experience

1. Data Scientist

   Times Internet

   Aug 2024 — Present · Noida, IN

   Recommender System• Built personalized feed and push notification recommendation systems serving 1.7M+ users across iOS and Android.• Designed candidate generation using WALS matrix factorization and ScaNN-based ANN search over 50K+ articles.• Developed ranking and re-ranking models with click normalization and position bias correction to optimize CTR.• Added a sampling-based exploration strategy in production to preserve content diversity and mitigate selection bias.• Productionized ML pipelines using TensorFlow (candidate generation) and PyTorch (ranking); orchestrated via Airflow.• Delivered 120% CTR uplift with stable DAU/MAU and +15% scroll depth at < 200 ms P95 latency on FastAPI/Kubernetes.2. Editorial Judgement System• Designed an LLM-powered editorial decision layer for feed and push distribution, aligned with human editorial standards.• Extracted structured editorial signals using LLaMA-3.1-70B with SFT and QLoRA for semantic content understanding.• Integrated LLM features with ML ranking and rules, achieving additional ∼ 80% CTR uplift and ASPIRE Award recognition.3. Agentic Editorial Knowledge Retrieval System (Archive RAG)• Built agentic RAG over TOI (4M articles) using Milvus + OpenSearch hybrid retrieval with cross-encoder reranking.• Designed metadata-aware retrieval with section and temporal routing for background, latest, and timeline editorial research.• Enabled LLM inference via vLLM (LLaMA-3.1-70B) with citation-grounded generation to ensure archive-first responses.• Deployed LangGraph-based agent pipeline in production on Kubernetes, reducing manual archive lookup for editors.

Education

• Chaudhari Nihal Singh Inter College, Aimi Pilibhit (UP)

  Intermediate Education

  2014 — 2016

• Indian Institute of Technology, Kharagpur

  Bachelor of Technology, Ocean Engineering and Naval Architecture

  2017 — 2021