Major Project
Web Development
Real-Time Collaborative Code Editor
Multiplayer editing with CRDTs, live cursors and sandboxed execution
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Web Development · Capstone
Multi-Tenant Invoicing SaaS
GST invoices, PDF generation and recurring billing for many businesses
5-6 weeks build
Overview
Each business signs up as a tenant with its own customers, products and GSTIN, and every query is scoped to that tenant so data never leaks between them. Invoices apply CGST and SGST or IGST depending on place of supply, render to PDF with sequential numbering, and can repeat on a schedule through a background job queue. Owners, accountants and viewers get different permissions.
What makes it stand up
- 01Tenant isolation enforced on every query, with tests that try to break it
- 02GST calculation for intra-state CGST plus SGST and inter-state IGST
- 03Server-side PDF invoices with gap-free sequential numbering per tenant
- 04Recurring invoices and payment reminders on a background job queue
- 05Role-based access for owner, accountant and read-only viewer
Module breakdown
- 01
Tenancy
Sign-up, workspaces and tenant-scoped data access.
- 02
Catalogue
Customers, products, HSN or SAC codes and tax rates.
- 03
Invoicing
Draft, issue, credit notes and PDF rendering.
- 04
Billing jobs
BullMQ workers for recurring invoices and reminders.
- 05
Access and audit
Roles, invitations and an audit log of every change.
After this, you will be able to
- Explain your multi-tenancy model and how isolation is tested
- Defend your GST logic and invoice numbering rules
- Demo two tenants side by side with a recurring invoice firing
Technology stack
- Next.js
- TypeScript
- PostgreSQL
- Prisma
- Redis
- Docker
- Level
- Capstone
- Domain
- Web Development
- Build time
- 5-6 weeks
- Difficulty
You receive
- Complete, commented source code
- 60-90 page project report (IEEE format)
- Editable presentation deck
- Architecture, ER and UML diagrams
- Local setup and deployment guide
- Sample dataset or seed data
- Viva question bank with answers
- One 45-minute walkthrough call
- 30 days of doubt-clearing support