You will get Multi Tenant Full Stack Web App (B2B) - Next + Nest + Database (Your Spec)
Project details
Building a B2B SaaS? Multi-tenancy done wrong is a security disaster. I'll do it right - from day one.
I specialise in production-grade multi-tenant SaaS using NestJS + Next.js, with your choice of PostgreSQL, MongoDB, Postgres via Supabase or NeonDB.
What I build:
✔ Tenant isolation — PostgresSQL RLS + app-level filtering (dual-defense)
✔ Role-based access control per tenant (owner, admin, member)
✔ Tenant onboarding & provisioning flow
✔ NestJS backend — modular, typed, scalable
✔ Next.js frontend — App Router, TypeScript, Tailwind CSS
✔ Auth — JWT, session management, invite flows
✔ Stripe billing — plans, trials, per-seat pricing
✔ REST API + Swagger docs
✔ Docker + CI/CD + zero-downtime deployment
✔ Your database of choice or we discuss as per the usecase
Built this for Kavlo — a live enterprise SaaS with strict tenant isolation and deep integrations.
You get the speed of a small team with the accountability of one senior engineer.
📌 Share your spec — I'll scope it honestly.
I specialise in production-grade multi-tenant SaaS using NestJS + Next.js, with your choice of PostgreSQL, MongoDB, Postgres via Supabase or NeonDB.
What I build:
✔ Tenant isolation — PostgresSQL RLS + app-level filtering (dual-defense)
✔ Role-based access control per tenant (owner, admin, member)
✔ Tenant onboarding & provisioning flow
✔ NestJS backend — modular, typed, scalable
✔ Next.js frontend — App Router, TypeScript, Tailwind CSS
✔ Auth — JWT, session management, invite flows
✔ Stripe billing — plans, trials, per-seat pricing
✔ REST API + Swagger docs
✔ Docker + CI/CD + zero-downtime deployment
✔ Your database of choice or we discuss as per the usecase
Built this for Kavlo — a live enterprise SaaS with strict tenant isolation and deep integrations.
You get the speed of a small team with the accountability of one senior engineer.
📌 Share your spec — I'll scope it honestly.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$300
|
Standard
$1,000
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 3 days | 20 days | 60 days |
Number of Revisions | 2 | 4 | 9 |
Number of Pages | 4 | ||
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$100 - $4,000
1 Month Post-Launch Maintenance
(+ 1 Day)
+$150Frequently asked questions
About Siddharthkumar
AI-Native SaaS Engineer | NestJS | Next.js | Multi-Tenant Systems
Surat, India - 10:30 pm local time
50K+ users handled. 11M records migrated. 5 production systems shipped. AI-native. Architecture-first.
Most apps work at the start then fall apart when users, integrations and workflows grow. I get the architecture right from day one so you don't waste months rebuilding.
─── What I've shipped ───
Kavlo (live)
Enterprise contract intelligence SaaS. Multi-tenant with dual-layer isolation (Supabase RLS + app-level filtering — zero cross-tenant leakage). AI document pipeline: PDF → FastAPI/Celery → LLM parsing → PostgreSQL JSONB → validated UI. Vendor workflows triggerable from Slack, Claude or Teams via MCP server. Zero-downtime CI/CD on Azure Container Apps.
TypingBolt (live · 50K+ users)
Rebuilt an entire platform solo in 1 month. Migrated 50K+ users and 11M+ records from MySQL to MongoDB — zero downtime, zero data loss.
AI-personalized learning via LLM. Running stable in production for 12+ months.
Network File Search (github: sidvekariya510)
Distributed file search system across 25TB+ of data. Sub-second search. Built solo in 20 days using Go + Node.js + React.
─── How I work ───
I don't just write code — I design systems.
Architecture, scalability and code quality handled end to end. AI helps me move faster. Every decision and review is done by me.
→ You get the speed of a small team
→ With the accountability of one senior engineer
─── Stack ───
Backend: NestJS · Node.js · Python (FastAPI + Celery) · Express
Frontend: Next.js · React · TypeScript · TanStack · Vite
Data: PostgreSQL · Supabase · MongoDB · Redis · NeonDB
Cloud: Azure ACA · Docker · GitHub Actions · DigitalOcean
AI/LLM: Claude · MCP Protocol · OpenAI
Integrations: Stripe · Nylas · Merge.dev · WebSockets
─────────────────────────────────────────────
If you're building something that needs to scale — let's talk.
Portfolio: siddharthvekariya.netlify.app
Steps for completing your project
After purchasing the project, send requirements so Siddharthkumar can start the project.
Delivery time starts when Siddharthkumar receives requirements from you.
Siddharthkumar works on your project following the steps below.
Revisions may occur after the delivery date.
Architecture & Database Design
After requirements are received, I map out the database schema and API structure tailored to your multi-tenant logic.
Backend & API Development (NestJS)
I build the secure foundation, including authentication, tenant isolation and core business endpoints.