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$
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I will build mern stack saas web application with ai integration
Sajal D.
5.0
5.0
Gig Summary
About this gig
I build SaaS platforms and AI-powered web apps for startups and businesses, from MVP to production, using the MERN stack.
40 completed projects for 17 clients, including repeat business, with 36 five-star reviews. I've built and maintained subscription-based SaaS products with real paying customers, so I understand billing, auth, and retention, not just demos.
What I build:
- SaaS platforms & MVPs
- AI-powered features (chatbots, automation, smart search)
- Custom dashboards & client portals
- Subscription & billing systems (Stripe)
- Booking & e-commerce solutions
Services:
- MERN stack development end to end
- AI integration (OpenAI, Claude, Gemini, chatbots, automation)
- REST API development & third-party integrations
- Authentication, database design, payment gateways
- Bug fixes, optimization, feature upgrades
Tech Stack:
- Frontend: React.js, Next.js, TypeScript, Tailwind CSS
- Backend: Node.js, Express.js, NestJS
- Database: MongoDB, PostgreSQL, Supabase
- AI: OpenAI, Claude, Gemini
- Cloud & DevOps: AWS, Docker, CI/CD Firebase
Have a unique project? Message me for a custom offer.
Check the packages below, or message me to start building your SaaS product.
Get to know Sajal D.
Sajal D.
Full Stack Developer, SaaS and AI Apps
- FromBangladesh
- Member sinceJul 2019
- Last delivery1 year
Languages
Bengali, English
I'm a Full Stack Developer, and most of my work is building SaaS products for startups and small businesses, from the first prototype through launch.
So far I've completed 40+ projects for 17+ clients, several of them repeat clients who came back for more work.
Once something's live, I stick around for the part most people skip: fixing what breaks, keeping it secure, and making sure it can grow without falling apart.
If you've got a project in mind, I'm happy to talk it through.
FAQ
What information do you need to get started?
Please share your project requirements, feature list, preferred tech stack, and any existing assets like wireframes, designs, or API docs.
Do you develop both frontend and backend?
Yes. I build full-stack apps using React.js, Next.js, Node.js, Express.js, NestJS, MongoDB, and PostgreSQL, depending on your needs.
Can you work with an existing project?
Yes. I can add features, fix bugs, optimize performance, or continue development on existing React, Next.js, Node.js, or MERN Stack apps.
Do you provide source code?
Yes. All packages include clean, well-structured source code unless otherwise agreed beforehand.
Should I contact you before placing an order?
Yes, Please message me first so we can confirm your requirements and make sure everything is scoped correctly before ordering.
How long will my project take?
Basic: 2 days. Standard: 10 days. Premium: 21 days. Larger or more complex projects may need a custom timeline, confirmed before you order.
What if my project needs more than what's listed in a package?
Yes. If your project doesn't fit the listed packages, message me for a custom offer.
Do you have experience integrating AI features?
Yes. I've built AI-powered features like chatbots, automation, and smart search using OpenAI, Claude, and Gemini.
Do you offer support after delivery?
Yes, I provide 7 days of post-delivery support to fix issues related to the delivered work. Ongoing maintenance or new features beyond that can be arranged separately.
Will you deploy the application?
Yes. Deployment assistance can be provided based on the package or project requirements. Please contact me before ordering if deployment is required.
Reviews
36 reviews for this Gig
| (35) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
G guignardvilmar
United States
Sajal has been exceptional to work with. He is highly professional, providing well-detailed plans outlining his approach to the project. His communication skills are excellent, and he is always polite and respectful. I definitely plan to work with him again and would highly recommend his services.
$800-$1,000
Price
6 months
Duration
M 
Seller's Response
Helpful?G g_and_n_terra
Greece
Great job on-time delivery.
$200-$400
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Awesome job, thank you for dedicated attention.
$600-$800
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Flawless beyond expectations in all areas underpinned by professional IT approach and diligence. Absolutely 5-star service and highly recommended.
$600-$800
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Brilliant as always.
$200-$400
Price
1 day
Duration
M Seller's Response
Helpful?
Reviews
36 reviews for this Gig
| (35) | ||
| (1) | ||
| (0) | ||
| (0) | ||
| (0) |
Rating Breakdown
- Seller communication level
- Quality of delivery
- Value of delivery
Sort By
Most relevant
G guignardvilmar
United States
Sajal has been exceptional to work with. He is highly professional, providing well-detailed plans outlining his approach to the project. His communication skills are excellent, and he is always polite and respectful. I definitely plan to work with him again and would highly recommend his services.
$800-$1,000
Price
6 months
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Great job on-time delivery.
$200-$400
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Awesome job, thank you for dedicated attention.
$600-$800
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Flawless beyond expectations in all areas underpinned by professional IT approach and diligence. Absolutely 5-star service and highly recommended.
$600-$800
Price
1 day
Duration
M Seller's Response
Helpful?G g_and_n_terra
Greece
Brilliant as always.
$200-$400
Price
1 day
Duration
M Seller's Response
Helpful?
