Shuvam Banerji Seal

A Hybrid RAG Architecture for Verifiable Answer Synthesis with Automated Source Citation

RAG systems · Dr. Dwaipayan Roy, CDS, IISER Kolkata

Comprehensive RAG pipeline for IISER-K intranet: automated data acquisition via Selenium, OCR with PyMuPDF/EasyOCR, context-aware chunking, Qwen3-4B embeddings in FAISS, hybrid BM25+dense retrieval, hypothetical-answer query refinement, and verifiable inline citations in Streamlit.

• RAG
• FAISS
• Qwen3-4B
• BM25
• Selenium
• Streamlit

Developing an Advanced Retrieval Model for TREC-Tip of Tongue Queries

Published · Information retrieval · Dr. Dwaipayan Roy, IISER Kolkata · TREC 2024 Proceedings

Multi-layer BM-25 filtering with dynamic search-domain contraction, transformer query expansion, semantic matching via Local LLMs with multi-shot chain-of-thought prompting, matching DPR-class performance.

• BM25
• Query Expansion
• Chain-of-Thought
• DPR

Computational Modeling of [VO(SALIEP)(DTP)] as Water Reducing Catalyst

Computational chemistry · DFT · Dr. Soumyajit Roy, IISER Kolkata · To be submitted

DFT methods (B3LYP) for MO energy calculations and electronic structure analysis in Gaussian; mechanistic studies via transition state theory and reaction pathway analysis for catalyst performance prediction.

• DFT
• Gaussian
• B3LYP
• Transition State

Hierarchical Opinion Classification with Large Language Models

Submitted · NLP and LLMs · With Alok Mishra and Utkarsha Ghosh

Parameter-efficient fine-tuning of Gemma-1B for hierarchical opinion classification: lightweight two-layer head, selective transformer block updates, 8-class reformulation with class-weighted loss for minority-class performance.

• Gemma-1B
• PEFT
• Opinion Mining

IISERK@ToT_2024: Query Reformulation and Layered Retrieval for Tip-of-Tongue Items

Information retrieval · TREC 2024 · With Subinay Adhikary, Soumyadeep Sar and Dr. Dwaipayan Roy

Four-step query reformulation + two-layer retrieval (BM25 + LLM), achieving best NDCG metrics for the TREC 2024 Tip-of-the-Tongue track.

• BM25
• NDCG
• TREC 2024

IndicAgri: AI platform for Indian agriculture

Hackathon · Capital One Launchpad 2025 · Top 14 / 5000+ Teams

Multi-modal (text+voice) RAG chatbot for 20+ Indian languages with Gemma/DeepSeek LLMs; agentic pipeline for 15k+ document curation.

• RAG
• Gemma
• DeepSeek
• Indic NLP

Automated WhatsApp Bulk Messenger with Google Sheets Integration

Independent · Automation

Python + Selenium bulk messaging with CSV/Google Sheets API, Unicode, session persistence, and error handling.

• Python
• Selenium
• Google Sheets API

Automated Event Coupon Management System with QR Verification

Independent · Event tech

Flask + Google OAuth 2.0, bulk email, unique QR codes, real-time mobile verification, and automated thank-you emails.

• Flask
• QR Codes
• Google OAuth

RAG Application for CCA-2015 Legal Document Retrieval

Independent · Legal tech

Selenium scraping, then Mistral-OCR JSON base, ChromaDB, Nomic embeddings, and LLaMA-3.2:1B in Streamlit.

• ChromaDB
• LLaMA
• Nomic

GTK4 Full-Stack Application in C

Academic · Systems programming · Supervised by Dr. Kripabandhu Ghosh

Complete GUI with GTK4 / Glade, SQLite3 backend, and BM25-based NLP chatbot retrieval.

• C
• GTK4
• SQLite3
• BM25

Wi-Fi Channel Optimizer

Independent · Networking

Bash automation for channel selection via network scanning + speed testing (speedtest-cli + nmcli).

• Bash
• nmcli
• Network

Anicon 3.0 web lead, IISER Kolkata

Web development · Inquivesta XI

Developed and led web development for Anicon 3.0 at Inquivesta XI, IISER Kolkata.

EFAML lab website, Dr. Soumyajit Roy

Research outreach

Designed the EFAML (Materials Science) lab page for Dr. Soumyajit Roy at IISER Kolkata.

Private educator and technical trainer

Education · Mentorship · 50+ students mentored

Advanced Computing and Basic Sciences instruction for board and competitive examinations.

Event organization and social impact

Community · Leadership

Organized Anicon 3.0 (500+ participants), GIAN Courses on Soft-Oxometalates and X-Ray Crystallography, Supra-Molecular Discussions 2024. COVID-19 relief coordinator; Ek-Pehal educational mentor. District Debate and Quiz finalist; Shotokan Karate; Art and Painting (stroke art and portraits).

BS-MS · Chemistry Major · CS Minor

IISER Kolkata

B.Sc Honours in Physics

Calcutta University

Higher Secondary (WBCHSE)

Jodhpur Park Boys' High School · 83%

Secondary (WBBSE)

The New Horizon High School · 83.75%