You will get a production-ready SaaS web app — React, Next.js, Node, Supabase
Top Rated
Top Rated
Project details
I build production-ready SaaS web apps — the kind you can keep growing on, not throwaway demo code that breaks the moment real users show up. React, Next.js, Node & Supabase end to end. Most founders I work with are at one of two points: you have an idea and want it built properly the first time — auth, payments, database, dashboard — or you have something half-built that needs to actually work in production. I handle both, and I'll tell you honestly what your v1 should and shouldn't include so you're not paying for features before you've proven anyone wants them. You get a clean, scalable codebase that's fully yours from day one, Stripe billing and subscriptions done right rather than bolted on, secure auth and role-based access, and a real deployed app instead of a prototype — with clear communication and no disappearing mid-project. For proof: I built VNYX, a multi-tenant SaaS platform where multiple businesses run on the same system with a five-tier role hierarchy, and none can ever see another's data — isolation enforced on every request, not left to the interface.
Programming Languages
JavaScript, TypeScriptWhat's included
| Service Tiers |
Starter
$1,000
|
Standard
$2,000
|
Advanced
$4,000
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 30 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 3 | 6 | 10 |
Design Customization | |||
Content Upload | - | ||
Responsive Design | |||
Source Code |
3 reviews
(3)
(0)
(0)
(0)
(0)
This project doesn't have any reviews.
ZW
Zige W.
Jan 20, 2026
NFT Marketplace Development Expert Needed
Highly skilled Full-Stack Web3 & NFT Marketplace Developer
Kaushik delivered excellent work across both front-end and back-end development for our NFT marketplace. He showed strong expertise in React and Next.js for building a smooth, user-friendly interface, along with Node.js for backend APIs and business logic.
On the Web3 side, he handled NFT smart contract integration, wallet connections, minting and transaction flows with great attention to security and reliability. He also provided valuable input on architecture, performance, and scalability.
Communication was clear and proactive, deadlines were consistently met, and the overall quality of work was excellent. We would gladly work with him again.
Kaushik delivered excellent work across both front-end and back-end development for our NFT marketplace. He showed strong expertise in React and Next.js for building a smooth, user-friendly interface, along with Node.js for backend APIs and business logic.
On the Web3 side, he handled NFT smart contract integration, wallet connections, minting and transaction flows with great attention to security and reliability. He also provided valuable input on architecture, performance, and scalability.
Communication was clear and proactive, deadlines were consistently met, and the overall quality of work was excellent. We would gladly work with him again.
BH
Brandon H.
Sep 21, 2022
Web3 Full Stack Developer (VueJS, Web3JS, EthJS)
He is amazing at his work and able to go above and beyond for things we missed out during the process. He works until you are satisfied and even offers his knowledge whenever possible! I’m super impressed and he is truly one of the best I’ve seen on Upwork!!
MU
Mams U.
Aug 19, 2022
Line Graph Chart with Tooltip in React Native
Kaushik communicated clearly and concisely. He researches the task fully before engaging in the project. He is very component in his work and is always available for discussions.
He kept us engaged and updated at all times.
He kept us engaged and updated at all times.
About Kaushik
Full-Stack & React Native Developer | SaaS, Next.js, Node, Supabase
100%
Job Success
Dhari, India - 3:01 pm local time
8+ years in, most of my work is one of two things. Either a founder has an idea and needs it built properly the first time — the database, the payments, the mobile app, the admin side — without it collapsing the moment real users arrive. Or someone already has a product, often started by another developer or an AI tool, that almost works but can't be trusted, and they need someone to take it over and finish it honestly.
I've done both ends of that. I built VNYX, a multi-tenant SaaS platform that resale businesses use to grade products, generate listings with AI, and sync them across marketplaces like Shopify and eBay — where multiple businesses run on the same system and none can ever see another's data, isolated on every request through a five-tier role hierarchy. And on PepsiCo's MiNegocio+, a B2B ordering platform live across 8 countries for a Fortune 50 company, I worked on React Native apps that had to keep working with no signal at all — distributors placing orders offline and syncing cleanly on reconnect, with no duplicate or lost orders.
My stack is React, Next.js, Node, and TypeScript on the web, React Native on mobile, with Postgres, Supabase, and Stripe underneath. I lean on AI tools like Claude Code to move quickly — and I read every line they write, which is exactly why I'm comfortable cleaning up a codebase one started.
What you're really hiring is someone who'll tell you the truth about your product, build it to survive growth, and still be around after it ships. If that's what you need, tell me what you're working on and where it hurts.
Steps for completing your project
After purchasing the project, send requirements so Kaushik can start the project.
Delivery time starts when Kaushik receives requirements from you.
Kaushik works on your project following the steps below.
Revisions may occur after the delivery date.
Scope & plan
We lock the v1 feature list, screens, and data model, and agree on what's in and out so there are no surprises.
Database & auth setup
I set up the Supabase/Postgres schema, secure authentication, and role-based access as the foundation.