You will get a Scalable and Custom Web Application built with MERN Stack
Project details
Why settle for a template when your business is one of a kind? Off-the-shelf software is like a suit that doesn’t fit—it’s either too tight on features or too loose on performance.
I build custom MERN(MongoDB, Express.js, React.js, Node.js & Nest.js) stack solutions tailored specifically to your business logic. From the initial database schema to the final API integration, I engineer every layer to ensure your application can handle 10X growth without breaking a sweat.
What this service includes:
1. Tailored Business Logic: Custom-built features designed for your specific workflow.
2. Scalable Architecture: A solid MERN foundation ready for future expansion.
3. Premium User Experience: Modern, responsive interfaces built with React.js.
4. Secure API Integration: Robust Node/Express /Nest backend with industry-standard security.
5. High Performance: Optimized MongoDB and Postgresql queries.
Stop building on 'shaky ground.' Let’s build a custom digital asset that scales as your vision grows.
I build custom MERN(MongoDB, Express.js, React.js, Node.js & Nest.js) stack solutions tailored specifically to your business logic. From the initial database schema to the final API integration, I engineer every layer to ensure your application can handle 10X growth without breaking a sweat.
What this service includes:
1. Tailored Business Logic: Custom-built features designed for your specific workflow.
2. Scalable Architecture: A solid MERN foundation ready for future expansion.
3. Premium User Experience: Modern, responsive interfaces built with React.js.
4. Secure API Integration: Robust Node/Express /Nest backend with industry-standard security.
5. High Performance: Optimized MongoDB and Postgresql queries.
Stop building on 'shaky ground.' Let’s build a custom digital asset that scales as your vision grows.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$50
|
Standard
$250
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 5 days | 14 days | 30 days |
Number of Revisions | 3 | Unlimited | Unlimited |
Number of Pages | 3 | 6 | |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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FV
Fannie V.
Jan 31, 2026
MERN Stack (NestJS) Developer Needed – Crypto Swap Bug Fix & Chat Module Implementation
Great experience working with Azhar. He fixed the swap module bug efficiently and implemented the chat module exactly as required. Very professional, good communication, and clean code. Highly recommended and happy to work together again.
About Azhar
Senior Full Stack Developer | MERN, Next.js & NestJS | Fintech & SaaS
50%
Job Success
Islamabad, Pakistan - 8:52 pm local time
If you're building a product that needs to stay fast, secure, maintainable, and reliable under real production traffic, I focus on the engineering foundation that makes that possible.
At Extsy, a fintech crypto exchange, I built a React & Next.js trading dashboard and optimized backend performance with MongoDB indexing and Redis caching — reducing average API response time from 1.8s to 340ms while handling thousands of concurrent trading requests without downtime.
At Finzone, an ERP platform, I architected a modular full-stack codebase using NestJS and TypeScript, with a focus on clean architecture, maintainability, and long-term scalability.
What I can build and improve:
- Frontend & Web Applications
1. React.js & Next.js
2. TypeScript & JavaScript
3. Responsive, mobile-first web applications
4. Dashboards and complex user interfaces
- Backend & APIs
1. Node.js, Express.js & NestJS
2. REST API development
3. API integration and third-party integrations
4. Authentication, authorization, and secure backend systems
- Databases & Performance
1. MongoDB & PostgreSQL
2. Database architecture and query optimization
3. MongoDB indexing
4. Redis caching
5. API and application performance optimization
- SaaS & Production Systems
1. SaaS application development
2. Scalable web application architecture
3. Modular backend architecture
4. AWS, Docker, and CI/CD
5. Production deployment and ongoing optimization
I'm a Senior Full Stack Developer with 5 years of experience building crypto exchanges, ERP platforms, SaaS products, and other production web applications. I don't just make features work — I build systems that are easier to maintain, scale, and improve as the product grows.
If you need a React / Next.js frontend, Node.js / NestJS backend, REST API, SaaS application, or a complete full-stack web application, I can help take it from architecture and development through production deployment.
- FAQ
Q1: Can you handle both frontend and backend for my MVP?
Yes. I build end-to-end web applications using React, Next.js, Node.js, and NestJS, including REST APIs, databases, authentication, third-party integrations, and deployment.
Q2: Can you work on an existing application rather than building from scratch?
Yes. I can audit and improve existing codebases, fix bugs, optimize APIs and database queries, improve application performance, and refactor systems toward a more maintainable architecture.
Q3: What technologies do you primarily work with?
My core stack is React, Next.js, Node.js, NestJS, TypeScript, MongoDB, PostgreSQL, Redis, Docker, and AWS.
Q4: Can you build a scalable SaaS application?
Yes. I focus on modular architecture, clean APIs, database design, performance, security, and production deployment so the application has a solid foundation for future growth.
Q5: Do you provide post-launch support?
Yes. I provide a post-launch support window to address deployment issues, bugs, and initial production problems.
Steps for completing your project
After purchasing the project, send requirements so Azhar can start the project.
Delivery time starts when Azhar receives requirements from you.
Azhar works on your project following the steps below.
Revisions may occur after the delivery date.
Discovery & Technical Roadmap
We discuss your unique business logic and core features to create a clear development roadmap.
Deployment & Handover
Launching your custom app on your server and providing full source code with a system walkthrough.