Nieveatha J S

WORK HISTORY

EDUCATION

ABOUT NIEVEATHA J S

Portfolio : https://nieveathajs.netlify.app/I am a Data Scientist and Software Engineer with a Master’s in Data Science & Artificial Intelligence from Northwestern University (GPA: 3.97/4), combining enterprise mainframe engineering expertise with modern AI, ML, and data-driven system design.At Infosys and Tata Consultancy Services, I worked on large-scale mainframe development and modernization using COBOL, CICS, JCL, PL/I, DB2, IMS, and REXX, with experience in AI/ML-driven automation, mainframe-to-cloud migration, and L3/L4 reverse engineering, including a prompt-engineering tool I developed to accelerate legacy system analysis & documentation backed by strong Capital Markets domain knowledge.Alongside my enterprise background, I built strong expertise in Data Science, Machine Learning, Deep Learning, and Generative AI through rigorous coursework and hands-on projects across NLP, Computer Vision, recommender systems, and agentic AI.Key Projects• Hybrid RAG System (PDF QA): BM25, FAISS + Sentence Transformers, hybrid score fusion, and cross-encoder re-ranking to generate grounded, citation-based answers via Gradio.• Agentic AI SQL Dashboard: Developed a natural-language-to-SQL dashboard using Streamlit and Google Gemini with safe read-only querying, visualizations, and offline fallback.• Cognithic – Adaptive EdTech Recommender: Personalized learning platform using HDBSCAN, CBF, SVDCF, Multi-Armed Bandits, and Reinforcement Learning to improve engagement and reduce dropout.• Resume Screening & Recommendation: HRTech system using Sentence-BERT and Neo4j for semantic job–resume matching.• Chicago BI Pipeline: End-to-end Airflow + PostgreSQL + Tableau analytics across 7+ datasets.Core SkillsAI / ML: ML, DL, CNNs, RNNs, LSTMs, Transformers, Ensembles, Transfer Learning, RL, RAG Systems, Knime, CelinosNLP & CV: BERT, Sentence-BERT, spaCy, GPT-4, Semantic Search, Document Retrieval, Generative AI, Facial Emotion RecognitionData Eng & Analytics: ETL, Airflow, PostgreSQL, SQL, Pandas, Spark, Tableau, Predictive Modeling, Optimization, SimulationMainframe: COBOL, CICS, JCL, DB2, IMS, PL/I, REXX, L3/L4,Assembler, DB2, IMS, TSO/ISPF, ENDEVOR, JOBTRAC, ChangemanCloud & Apps: AWS, Google Cloud, Streamlit, Gradio, API IntegrationEducation MS in Data Science & AI – Northwestern University (GPA: 3.97/4)Courses: Business, Marketing & Decision Analytics; ML, DL, CV, AI, NLP; Data Eng, DB Systems; Governance & Ethics; Statistics (R); Math for Data Scientists; SQL; Capstone BE – Anna University, GPA 8.7/10, First Class with Distinction