I need a full-stack Python application that unifies three business-critical modules—HRMS, core CRM, and Accounting—inside a single web-based suite. Each module must be able to invoke Langchain workflows so that users can chat with their data, generate documents, and run natural-language queries without leaving the screen. Scope of work • HRMS: employee records management, automated payroll processing, and leave tracking, all secured by role-based permissions. • CRM: contact and deal pipelines plus an AI assistant that can summarise interactions or draft follow-up emails. • Accounting: double-entry ledger, invoicing, and expense tracking, with chatbot-driven report generation. Technical expectations – Python 3.11+ on the back end, preferably FastAPI or Django, wired to PostgreSQL. – Front-end delivered with React, Vue, or a similarly modern JS framework. – Langchain integrated against OpenAI (or other LLMs) for document parsing, conversational search, and automatic insight generation. – Clean, modular code in a Git repo, complete with unit tests and Docker files for local spin-up. Deliverables 1. Running web application covering the three modules above. 2. Source code with clear instructions for deployment. 3. Basic test suite proving key endpoints and Langchain calls work. 4. Short Loom or written walkthrough showing core flows. If you’re comfortable owning both the Python stack and Langchain integrations, let’s talk about timelines and milestones so we can get this suite into production quickly.