Sudip Das

Built and delivered a full-stack client portal using Next.js, React, TypeScript, and MySQL. Implemented JWT-based authentication and RBAC using HTTP-only cookies, secure password hashing, protected routes, session management, and user approval workflows. Integrated Xero OAuth 2.0 and Freshdesk REST APIs for invoice and ticket management, including token refresh, webhooks, pagination, rate-limit handling, and PDF invoice retrieval. Developed responsive React/Next.js dashboards and data-driven interfaces with Tailwind CSS and Zustand—supporting searchable/filterable tables, server-side pagination, inline editing, reusable components, loading states, and role-based navigation. Enhanced an IT Q Commerce B2B CRM frontend with Next.js/React/Tailwind and implemented CRM features spanning contacts, companies, deals, campaigns, ideas, reporting, and activity management, including drag-and-drop deal pipelines, analytics dashboards, dynamic custom fields, permission management, audit logs, and

Developed and maintained React.js-based telecom configuration interfaces for BSNL 4G, including file uploads, timing monitoring, and configuration workflow logic. Built responsive dashboards and reusable React components using React.js, JavaScript, HTML, and CSS for telecom operations. Used Zustand for centralized state management to improve data flow and reduce unnecessary component-level state. Integrated frontend applications with REST APIs to optimize API interactions and improve application performance. Collaborated with backend developers, QA testers, and TCS engineers to refine UI workflows based on operational requirements.