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CASE STUDYSAAS / B2B SOFTWARE · B2B PROCUREMENT ORDER LIFECYCLE PLATFORM

Ximkart

A B2B procurement suite spanning three apps, covering GST-compliant e-invoicing, the full purchase and sales order lifecycle, customer onboarding, and sales analytics.

88Weeks operated
4k+Hours of work
5Engineers

The brief

Build and extend a production-grade B2B SaaS procurement platform (Revind/Sevenloop/Nucleus) for Ximkart — covering India-compliant e-invoicing (IRN/EWB), full PO/SO lifecycle management, customer onboarding, and analytics — moving from initial API development through to a multi-app, AI-augmented commercial platform serving industrial buyers and sellers.

What we built

A full-stack, multi-application B2B procurement and order management SaaS platform built over 88 active weeks across three interconnected apps:

  • Revind — the primary seller/ops web app (React JS + Java backend) covering invoice management, GST e-invoicing (IRN/EWB/NIC), purchase orders (with recurring/cyclic logic, disbursement, image specs, enquiry-to-PO conversion), sales orders (with SO enhancement, PO-to-SO conversion, bulk upload), sales analytics dashboards, customer onboarding/verification, and a contextual homepage with actionables/summaries
  • Nucleus — an internal admin portal for org verification, product master management (grades, processes, routes, attribute dictionaries, usage types, media attributes), and PO/SO configuration
  • Sevenloop — a buyer-facing app with homepage, login/signup, production dashboard, category/org profiling, and order progress tracking. Late-stage additions include a real-time SSE notification system, AI-powered enquiry response (Enquiry AI, two phases), work order production management linked to sales orders, and automated order document generation with supply chain routing.
⊛ Live in production

Revind SaaS platform in production with: GST e-invoicing (IRN/EWB), full invoice management, PO/SO lifecycle (including recurring POs, bulk upload, PO-to-SO conversion), customer onboarding (multi-state verification), sales analytics dashboard, real-time SSE notifications, and homepage actionables. Sevenloop buyer app and production dashboard deployed to prod. Nucleus internal admin with attribute dictionary and org/product master config in prod. Enquiry AI Phase 1 & 2 pushed to SIT. Order Document Generation feature (Aman Gupta) in active development as of Nov 2025.

How it was built, phase by phase.

8 workstreams across 88 weeks of operated delivery

  1. (001)BUILDWeek 1–10 (Feb–Apr 2024)

    E-Invoicing & IRN/EWB Compliance (GST/NIC Integration)

    Full implementation of India's e-invoicing mandate: IRN generation, authentication and cancellation APIs, E-Way Bill (EWB) create/cancel/update/sync, NIC credential management, and TCS/TDS flows.

    ✓ Production-ready IRN generation, EWB lifecycle, and NIC credential management for GST-compliant invoicing

    JavaNIC Portal APIsPostgreSQLAWSJIRA
  2. (002)BUILDWeek 7–14 (Apr–May 2024)

    Invoice Management Module (Sales Order–linked)

    Full invoice entity lifecycle: schema design, creation, update, deletion, cancellation, pagination/filtered list views, adjustment flow, discount handling, SO-level invoice population API.

    ✓ Fully functional invoice management tied to sales order lifecycle with GST-compliant e-invoice generation

    JavaPostgreSQLAWS S3JIRA
  3. (003)BUILDWeek 14–22 (May–Jul 2024)

    Homepage & Actionable Summary APIs (SaaS Dashboard)

    Backend APIs powering the SaaS product homepage: FAQ API, Help Desk APIs, Actionable APIs, Summary APIs for core modules, Tutorials API, and customer-level PO/SO summary sorting.

    ✓ Contextual SaaS dashboard homepage surfacing pending actions, summaries, help content, and tutorials

    JavaPostgreSQLReact JS
  4. (004)BUILDWeek 18–26 (Jun–Aug 2024)

    Sales Analytics & Revenue Dashboard

    Multi-chart analytics backend and homepage dashboard: Revenue charts, Purchase Cost charts, Collection vs Revenue charts, Receivable & Collections charts, Order Volume charts, Sales Dashboard Summary cards.

    ✓ Real-time sales analytics homepage with revenue, cost, collections, and order volume visualizations plus CSV export

    JavaPostgreSQLAWSJIRA
  5. (005)BUILDWeek 27–36 (Aug–Oct 2024)

    Customer Onboarding & Organisation Verification Flow

    End-to-end multi-state org onboarding: lead generation, org/org-member/BR table changes, account verification states (reattempt/rejected), invitation flow, password setup/reset links.

    ✓ Production-deployed self-serve customer onboarding with email-driven verification and admin-controlled approval workflow on Nucleus

    JavaPostgreSQLNMSUMSAWSJIRA
  6. (006)BUILDWeek 37–52 (Oct 2024–Jan 2025)

    Purchase Order Enhancement (Recurring, Disbursement, Enquiry-to-PO)

    Major PO module overhaul: cyclic/recurring PO creation with delivery and payment schedule entities, PO disbursement with attachment uploads, image upload per item specification, order history logging.

    ✓ Enhanced PO module supporting recurring orders, structured payment/delivery schedules, and end-to-end enquiry conversion

    JavaPostgreSQLAWS S3JIRA
  7. (007)INTEGRATEWeek 42–51 (Dec 2024–Jan 2025)

    Notification System (Real-time SSE + UI)

    Full notification feature: React UI for notification dialog box, notification page (desktop + mobile + tablet responsive), SSE (Server-Sent Events) real-time push integration, archive notifications API.

    ✓ Live notification system deployed to pre-prod with real-time delivery, archive, and responsive cross-device UI

    React JSSSEJavaJIRA
  8. (008)BUILDWeek 46–56 (Jan–Feb 2025)

    Sales Order Enhancement & PO-to-SO Conversion

    Parallel SO enhancement mirroring PO work: DB entity/model restructuring, payment module changes, delivery module changes, order history addition, image upload, SO-to-WO linking, SO list view updates.

    ✓ End-to-end order flow from enquiry → PO → SO → Work Order with bulk import and bidirectional linking

    JavaPostgreSQLReact JSAWS S3

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