# ResXiv > Search, cited reading, critique, and writing on one shared library - **Role:** Co-founder (Product + Research) - **Company:** ResXiv - **Period:** 2025 – Mar 2026 - **Users from:** Cornell, Princeton, Harvard, Adobe, Google, Aftershoot, IIIT Delhi, CMU, UMD, IIT, and more ResXiv was a browser research workspace: search papers, save them to a project, chat with citations, review drafts, and write in LaTeX from the same library. The backend used **FastAPI**, **PostgreSQL**, **Qdrant**, and **LangGraph**. Search covered **11 scholarly providers** and **280M+ catalog records** through live provider fan-out. Saved PDFs were chunked into Qdrant for cited RAG; drafts and LaTeX documents lived in the project database. The beta reached **300+ MAU** with users from Cornell, Princeton, Harvard, Adobe, Google, and others. ResXiv closed in **March 2026**; the search, critique, and IDE lessons carried into Noteweave. **Focus:** Research search, RAG, LangGraph, Fusion search, LaTeX, FastAPI, PostgreSQL, Qdrant [ResXiv search, eleven scholarly providers in one query.](https://yashwardhan.space/assets/videos/resxiv_clips/fusion_search_clip.mp4) ## Overall structure ResXiv kept research work in one project library. **Search** found papers, **RAG chat** answered from saved PDFs, **draft critique** checked citations and risks, and the **LaTeX editor** wrote against the same project records. **Take home:** **FastAPI** backend with **PostgreSQL** for projects and documents, **Qdrant** for PDF chunks, and **LangGraph** for research-agent routing. - **7** AI products - **3** core surfaces - **11** search providers - **300+** peak MAU ![ResXiv platform map](https://yashwardhan.space/assets/images/work/resxiv/system-architecture.svg?v=2) *Platform map* *Search, cited chat, draft critique, and LaTeX writing on one FastAPI backend.* ## Search, RAG, and writing stack The stack had three surfaces: live paper search, cited answers over saved PDFs, and draft / LaTeX writing. Each used the same project library. ### Search - One query fan-outs to **11 providers**: OpenAlex, arXiv, PubMed, bioRxiv, medRxiv, EuropePMC, ClinicalTrials, ISRCTN, PubChem, ChemRxiv, and Hugging Face Papers. - Results are normalized, deduped, filtered by year/provider when needed, and saved into the **PostgreSQL** project library. - Smart search used LLM routing for source choice and query intent. ### Cited chat - Saved PDFs ingest into **Qdrant** as chunks. Paper chat answers from those chunks with mandatory citations. - **LangGraph** routes research questions to search, project papers, paper analysis, web search, or author / field nodes. - X-Ray analysis highlights weak claims and unsupported lines inside a paper. ### Draft and LaTeX - **Draft critique** checks missing citations and risk before submission. - The **LaTeX editor** stores documents as project records, converts between editor schema and TeX, and keeps compile state tied to the same backend. - Notes, papers, drafts, and chats stayed inside one project workspace. ![ResXiv search, RAG, and writing architecture](https://yashwardhan.space/assets/images/work/resxiv/ai-layer.svg?v=1) *Search and RAG stack* *Live scholarly search, PostgreSQL project library, Qdrant PDF index, and LaTeX workspace.* ## Problem The core issue was citation trust. ResXiv answered from saved papers and project documents, so paper chat, draft critique, and research reports could point back to source material. [Search](https://yashwardhan.space/assets/videos/resxiv_clips/fusion_search_clip.mp4) *One query across eleven scholarly indexes with discipline tagging and deduplication.* ## What shipped The beta shipped five user-facing surfaces. ### Search - One query across **280M+** catalog records through live provider fan-out. [Search](https://yashwardhan.space/assets/videos/resxiv_clips/fusion_search_clip.mp4) *Eleven scholarly providers, normalized and deduped into one result list.* ### Research agent - Research question to cited field report using **LangGraph** routing. [Research agent](https://yashwardhan.space/assets/videos/resxiv_clips/research_agent_clip.mp4) *LangGraph routes questions to search, project papers, paper analysis, and web search.* ### Paper chat - Cited answers from saved PDFs in the project library. [Paper chat](https://yashwardhan.space/assets/videos/resxiv_clips/paper_chat_clip.mp4) *Qdrant RAG over ingested paper chunks with mandatory citations.* ### Write workspace - Notes, AI edits, and LaTeX compile in one workspace. [Write workspace](https://yashwardhan.space/assets/videos/resxiv_clips/write_workspace_clip.mp4) *Editor schema, TeX conversion, and compile tied to project records.* ### Draft analysis - Missing citations and draft risks before submission. [Draft analysis](https://yashwardhan.space/assets/videos/resxiv_clips/draft_analysis_clip.mp4) *Draft critique with citation checks and risk summary.* ## Impact Shipped as a production beta. Usage centered on search, cited paper chat, and draft critique. - **300+** monthly active users - **280M+** search catalog - **11** search providers ### Users from - Researchers and engineers from **Cornell**, **Princeton**, **Harvard**, **CMU**, **UMD**, **IIIT Delhi**, **IIT**, and other universities. - Industry users from **Adobe**, **Google**, **Aftershoot**, and more. - Top usage discipline tags: **AI/ML**, **medicine**, and **biology**. ### Traction - **300+ MAU** at peak on the production beta. - Co-founded with **Paridhi Mundra**, who led product and design. Search gateway, agents, RAG, ingestion, and editor were built on the research and engineering side. - Presented at the **Bharat Bodhan AI Conclave**. ![ResXiv booth at Bharat Bodhan AI Conclave](https://yashwardhan.space/assets/images/work/resxiv/resxiv-booth-crop.jpeg) *Bharat Bodhan AI Conclave* *Presenting ResXiv at the conclave after reaching 300+ MAU on the production beta.* ## Team - [Yashwardhan Chaudhuri](https://www.linkedin.com/in/yashwardhan-chaudhuri) (Co-founder (Product + Research)) - [Paridhi Mundra](https://www.linkedin.com/in/paridhi-mundra-1ba31622b) (Co-founder (Product + Design)) ## Impact Shipped as a production beta, then closed March 2026. - Seven products on one project library: search, research agent, RAG chat, draft critique, write workspace, AI-TeX, and ingestion. - 300+ MAU, with users from Cornell, Princeton, Harvard, Adobe, Google, Aftershoot, IIIT Delhi, CMU, UMD, and IIT. - Built on FastAPI, PostgreSQL, Qdrant, LangGraph, live scholarly APIs, and a LaTeX document service. ## Sources - [Full demo (YouTube)](https://www.youtube.com/watch?v=zhQY4xie4BA) --- [Back to portfolio](https://yashwardhan.space/) · [HTML case study](https://yashwardhan.space/work.html?p=resxiv)