You will get backend bugs fixed fast in Node.js, Express, MongoDB & more
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Top Rated
Project details
I specialize in quickly identifying and fixing backend issues across Node.js, Express, MongoDB, and other modern stacks. With a strong focus on clean, secure, and scalable code, I ensure your backend runs smoothly and reliably. Fast, efficient, and dependable service that gets results.
Programming Languages
PHP, HTML & CSS, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $499
These options are included with the project scope.
$499
- Delivery Time 7 days
- Number of Revisions Unlimited
- Number of Pages 1
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Manan N.
May 18, 2026
SAAS
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Adam S.
Feb 6, 2026
Full-Stack Developer for Caffriend (The Tinder of Networking)
It was a great pleasure working with Sanjay and his team. From the beginning, they were able to understand the scope of the product and were always willing to go the extra mile to meet our needs. Would definitely recommend working with Sanjay!
TK
Tom K.
Sep 2, 2025
Experienced Developer Needed for Product Ordering App (React JS, Angular, MySQL)
Very professional, very smart, help me with the project, took extra time to make sure I am happy with the project, I would use them again for my next project.
NA
Nour A.
Aug 27, 2025
Booking Platform
SM
Surya M.
Jul 20, 2025
ReactJS Frontend Developer Needed for SaaS Web App
Prompt and experienced developers. I would recommend for full stack work!
About Sanjay Kumar
Full-Stack SaaS Developer | React Native| Web & Mobile Apps| MERN| API
100%
Job Success
Ahmedabad, India - 10:42 am local time
Over the years, I've worked on products ranging from startup MVPs to large-scale operational platforms, helping clients launch new products, streamline business processes and modernize existing systems.
My work typically involves multi-role user systems, workflow automation, subscription platforms, dashboards, reporting, third-party integrations and mobile applications.
What I Usually Build:
- SaaS products, startup MVPs & internal business platforms
- React & Next.js web applications
- React Native mobile apps for iOS & Android
- Admin dashboards & multi-role systems
- API-driven platforms & backend systems
- Marketplace, booking & service-based platforms
- Subscription & payment-based applications
- Blockchain-enabled applications & Web3 platforms
- AI-powered features, workflow automation & operational tools
- Reporting, workflow & operational systems
My Approach:
- Clear backend architecture designed for long-term product growth
- Organized APIs & predictable data flow
- Frontend, backend & mobile applications designed as one product ecosystem
- Scalable systems built for long-term product growth
- Focus on reliability, maintainability & real-world usage
Tech Stack:
Frontend: React | Next.js | TypeScript
Mobile: React Native | Flutter
Backend: Node.js | NestJS | Express.js
Databases: PostgreSQL | MongoDB | Redis
Infrastructure: AWS | Docker | CI/CD
Integrations: Stripe | Firebase | Smart Contract Integrations | OpenAI APIs | REST APIs
Relevant Project Experience
- SaaS Platforms with subscription billing and role-based access
- Marketplace Platforms with payments, messaging and vendor workflows
- Property Management and Real Estate Platforms
- Blockchain Applications with wallet integrations and smart contract interactions
- Event Marketplace and Booking Systems
- Workflow Automation and Operations Platforms
- Mobile Applications connected to complex backend systems
Industries I work on:
SaaS • Healthcare • Mental Wellness • Fintech • Real Estate • Marketplace Platforms • E-commerce • EdTech • Operations Software • Social Platforms
Whether you're building a new SaaS product, launching an MVP, developing a mobile application or improving an existing platform, I can help take the project from planning and architecture through development, deployment and ongoing support.
Keywords:
SaaS Developer | SaaS Product Development | SaaS MVP Development | SaaS Architecture | Full-Stack SaaS Developer | Web & Mobile App Development | React Native Developer | AI Integration | Payment integration | Stripe Integration | React & Node.js Developer | Next.js Developer | Node.js Developer | NestJS Developer | API Development | REST API Design | Backend Architecture | Scalable API Systems | Database Design | PostgreSQL | MongoDB | Redis Caching | Admin Dashboard Development | Role-Based Access Control (RBAC) | Workflow Systems | Automation Systems | Payment Systems Integration | Stripe Integration | Blockchain API Integration | Wallet Integration | AI Features Integration | OpenAI API | Marketplace Platforms | Booking Systems | Android Development | iOS Development
Steps for completing your project
After purchasing the project, send requirements so Sanjay Kumar can start the project.
Delivery time starts when Sanjay Kumar receives requirements from you.
Sanjay Kumar works on your project following the steps below.
Revisions may occur after the delivery date.
Analyze the Reported Issue
Access and Set Up the Codebase