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.

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.

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.

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.

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

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

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

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

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

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

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

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

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

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

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 & Quiz finalist; Shotokan Karate; Art & Painting (stroke art & portraits).

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