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I will develop custom web application and ai saas as full stack mern developer
Sumit S
Level 1
5.0
5.0
What people loved about this freelancer
village_project
Brazil
Really happy with the landing page development. The team understood our requirements quickly and delivered a clean, modern, and professional landing page. ...
donna_hairsalon
United States
Great experience! They did an excellent job building the website for our hair salon and also updating the logo. The site looks clean, professional, and modern,...
picturepod360
United States
Excellent work! They understood exactly what I needed, made the code updates quickly, and everything worked perfectly. Great communication, professional, and...
About this gig
Are you looking for a modern, scalable custom web application or AI-powered SaaS built with the MERN stack and Next.js?
I am an experienced full stack MERN developer specializing in building production-ready web applications, startup MVPs, and responsive SaaS platforms. From responsive UI design to secure backend REST APIs and OpenAI integrations, I deliver clean, modular code tailored to your business needs.
What I Offer:
* Custom Web App Development (React, Next.js, Node.js, Express)
* AI SaaS Integration (OpenAI/ChatGPT APIs, AI Chatbots, Smart Workflows)
* Responsive Admin Dashboards, User Portals & Analytics
* Database Architecture (MongoDB, PostgreSQL, Firebase)
* Secure Authentication (JWT, OAuth) & Stripe Payment Gateways
* Cloud Deployment & CI/CD (Vercel, AWS, DigitalOcean)
Why Choose Me?
* Production-Grade Code: Clean, scalable, and well-documented architecture
* 3 Months Free Support: Complete post-launch bug fixes and technical support
* Full Ownership: Complete source code and deployment assistance
* Fast & Transparent Communication
Please message me before ordering to discuss your project requirements and technical roadmap. Let us build your SaaS!
Get to know Sumit S
Sumit S
AI Mobile App Development I AI Software Development I Full Stack Web Development
Level 1
- FromIndia
- Member sinceMar 2026
- Avg. response time1 hour
- Last delivery6 days
Languages
Hindi, English
Hi, I'm Sumit, a full stack developer with 14+ years of experience and 500+ projects delivered for clients across the US, UK, UAE, and India.
What I build:
- Web apps and SaaS platforms (React, Node.js, MERN)
- Mobile apps, native and cross-platform (React Native, Flutter)
- AI-powered products (OpenAI, ChatGPT, REST APIs)
App experience: fitness, dating, food delivery, taxi booking, fintech, and e-commerce, from MVPs to production scale.
What you get: clean code, clear communication, honest timelines. On time, on budget.
Message me, I usually reply within minutes.
My Portfolio
FAQ
What technologies do you use to build custom web applications?
specialize in the modern JavaScript/TypeScript ecosystem using the MERN stack (MongoDB, Express.js, React.js, Node.js) and Next.js for server-side rendering, SEO, and fast performance, styled with Tailwind CSS.
Can you integrate custom AI features and OpenAI APIs into my web app?
Yes. As an experienced AI SaaS developer, I integrate OpenAI (GPT-4o, ChatGPT), Claude, and open-source models. Features include custom AI chatbots, semantic search, automated content generation, voice/speech processing, and smart analytics.
How does the "3 Months Free Support" work?
Every full SaaS and complete web application build comes with 3 months of complimentary post-launch support. This covers bug fixes, performance monitoring, dependency updates, and minor UI adjustments to ensure your platform runs flawlessly.
Can you build the web application from my Figma or Adobe XD designs?
Absolutely. I can convert your Figma, Adobe XD, or Sketch designs into clean, pixel-perfect, and fully responsive React/Next.js code that looks great on mobile, tablet, and desktop screens.
Can you set up Stripe subscriptions and payment gateways?
Yes. I implement secure checkout flows, one-time payments, tiered recurring subscriptions, customer billing portals, and webhook event handling using Stripe, PayPal, or Lemon Squeezy.
Will you deploy the web app to my hosting server or cloud?
Yes. I handle end-to-end cloud deployment on Vercel, AWS, DigitalOcean, or Render, configure production environment variables, connect your custom domain name, and set up free SSL certificates.
I only have an idea for a SaaS. Can you help me build the MVP from scratch?
Yes. I work directly with non-technical founders to define user flows, design database schemas, build the core MVP features, and get your product ready for real users and investors.
Do I get 100% ownership of the source code?
Yes. Upon project completion and delivery, you receive full intellectual property ownership and the complete, well-documented source code repository (GitHub/GitLab).
Do I need my own cloud hosting and OpenAI accounts?
Yes. To ensure complete ownership and security, you will need your own hosting accounts (e.g., Vercel/AWS) and OpenAI API keys. I will guide you step-by-step through setting them up securely.
What should I do before placing an order?
Please click the "Contact Me" button to share your project brief, wireframes, or feature wishlist. We will discuss the optimal technical architecture, timeline, and I will create a tailored custom offer for your exact scope.
Reviews
3 reviews for this Gig
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| (0) | ||
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Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
V village_project
Brazil
Really happy with the landing page development. The team understood our requirements quickly and delivered a clean, modern, and professional landing page. The design is responsive, easy to navigate, and has a strong conversion-focused layout. Communication was smooth throughout the project, and they...
$100-$200
Price
10 days
Duration
Helpful?D donna_hairsalon
United States
Great experience! They did an excellent job building the website for our hair salon and also updating the logo. The site looks clean, professional, and modern, and they were responsive throughout the process. Very happy with the final result and would definitely recommend them!
$100-$200
Price
4 weeks
Duration
Helpful?P picturepod360
United States
Excellent work! They understood exactly what I needed, made the code updates quickly, and everything worked perfectly. Great communication, professional, and very easy to work with. I highly recommend them and would definitely hire them again!
$100-$200
Price
13 days
Duration
Helpful?
Reviews
3 reviews for this Gig
| (3) | ||
| (0) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
V village_project
Brazil
Really happy with the landing page development. The team understood our requirements quickly and delivered a clean, modern, and professional landing page. The design is responsive, easy to navigate, and has a strong conversion-focused layout. Communication was smooth throughout the project, and they...
$100-$200
Price
10 days
Duration
Helpful?D donna_hairsalon
United States
Great experience! They did an excellent job building the website for our hair salon and also updating the logo. The site looks clean, professional, and modern, and they were responsive throughout the process. Very happy with the final result and would definitely recommend them!
$100-$200
Price
4 weeks
Duration
Helpful?P picturepod360
United States
Excellent work! They understood exactly what I needed, made the code updates quickly, and everything worked perfectly. Great communication, professional, and very easy to work with. I highly recommend them and would definitely hire them again!
$100-$200
Price
13 days
Duration
Helpful?
