You will get a custom full stack web app with API integration
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Project details
You will get a professional Full Stack Web Application built using modern technologies like React, Node.js, Express, and MongoDB. With hands-on experience in developing responsive and scalable applications, I ensure clean code, optimized performance, and a smooth user experience. My work is detail-oriented, fully tested, and deployable on your preferred hosting platform (Vercel, Netlify, etc.).
What sets me apart?
✔ Full ownership of the process – from design to deployment
✔ Custom-built solutions tailored to your business needs
✔ Clear communication and timely delivery
✔ Post-project support to ensure everything runs perfectly
The work I deliver is 100% original, high quality, and secure, ensuring your application stands out.
What sets me apart?
✔ Full ownership of the process – from design to deployment
✔ Custom-built solutions tailored to your business needs
✔ Clear communication and timely delivery
✔ Post-project support to ensure everything runs perfectly
The work I deliver is 100% original, high quality, and secure, ensuring your application stands out.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Performance Optimization, Security, DesignWhat's included
| Service Tiers |
Starter
$50
|
Standard
$150
|
Advanced
$450
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 2 | 4 | Unlimited |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$20 - $100
Additional Revision
+$25
Additional Page
+$50
4 reviews
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UB
Uri B.
Aug 19, 2026
Designing the Site Design
Working with Saifullah was honestly a great experience from start to finish. He took our HTML/CSS/JS prototype and implemented it on our production site quickly and accurately, matching exactly what we needed. But beyond the technical work, what really stood out was how easy and pleasant he is to work with, he's kind, patient, and genuinely a great person to collaborate with. His English is excellent, and he has a real gift for explaining technical things in a simple, clear way whenever I needed something broken down for me as a non-technical founder. Communication was smooth throughout, and I always felt like I was in good hands. Highly recommend him, I'll definitely be working with him again.
IL
Ian L.
May 4, 2026
Supabase Project Setup and Vercel Integration
Saifullah went above and beyond to assist me in the project. He was knowledgeable and committed in landing the project in time. Will definitely make use of his services in future.
ST
Sudeep T.
Apr 21, 2026
Riverpe Product development
Great experience working together. Demonstrated strong ownership and consistently showed a good understanding of the requirements. Delivered reliably and communicated well throughout. Would definitely recommend.
AA
Abdul A.
Mar 18, 2026
Urgent: Fix Node.js Backend & Connect with Vercel Frontend (Next.js)
Saif was really quick in adapting things and errors. I hired him to deploy my backend in a very tight deadline and he just completed it in 2 hours! Really loved working with him. Highly recommended
About Saifullah
FinTech Backend Engineer | Node.js, PostgreSQL, Stripe Integration
100%
Job Success
Karachi, Pakistan - 10:41 am local time
I specialize in building secure, scalable backend systems for FinTech platforms and subscription-based SaaS products. My focus is on high-performance API architecture, payment infrastructure, and reliable database systems designed to handle real transactions and real revenue.
I don’t build “just working” APIs.
I engineer backend systems that are production-stable, secure, and built for scale.
💳 Subscription & Billing Infrastructure
Stripe subscription systems (plans, trials, upgrades, downgrades)
Webhook-based billing logic
Invoice generation & payment tracking
Usage-based billing systems
Multi-tier pricing architecture
Failed payment handling & retry logic
🔐 Secure SaaS Backend Architecture
Multi-tenant SaaS backend design
Role-based access control (RBAC)
JWT & OAuth2 authentication
Secure API authorization layers
Audit logs & activity tracking
Data isolation strategies
Security and clean architecture come first — especially in financial systems.
⚙️ Scalable API & System Engineering
REST & GraphQL API development
Modular backend architecture (NestJS / Express)
Background jobs & queue systems
Event-driven workflows
High-traffic API optimization
Error handling & production debugging
🗄 Database & Performance Optimization
Advanced PostgreSQL schema design
Query optimization & indexing strategies
Transaction-safe financial data handling
Redis caching layers
Data modeling for subscription systems
Prisma ORM & database migrations
Well-structured databases prevent scaling headaches later.
☁️ Cloud & Infrastructure (SaaS-Focused)
AWS (EC2, RDS, S3, Lambda)
Docker containerized environments
CI/CD pipelines
Secure production deployment
Infrastructure cost optimization
Monitoring & logging setup
I design backend systems that support uptime, performance, and growth.
📈 Systems I Build
Subscription-based SaaS platforms
FinTech dashboards & payment systems
API-first SaaS products
Internal financial tools
Usage-based SaaS platforms
Secure admin panels
🧠 How I Work
I think in systems before writing code.
Architecture planning
Database modeling
Secure authentication design
Modular API development
Billing & webhook implementation
Production deployment & monitoring
The result:
✔ Clean, maintainable backend
✔ Stable financial logic
✔ Scalable infrastructure
✔ Reduced technical debt
✔ Long-term SaaS readiness
If you're building a SaaS product that handles subscriptions, payments, or financial workflows, I can help you build the backend foundation correctly from day one.
Keywords
Node.js Backend Development, FinTech Backend Engineering, Subscription Billing Systems, Stripe Integration Developer, PostgreSQL Database Design, Multi-Tenant SaaS Architecture, Secure API Development, NestJS Backend Developer, SaaS Payment Infrastructure, REST API Development, GraphQL API Architecture, JWT Authentication Systems, AWS SaaS Deployment, Backend Performance Optimization, Usage-Based Billing Systems
Steps for completing your project
After purchasing the project, send requirements so Saifullah can start the project.
Delivery time starts when Saifullah receives requirements from you.
Saifullah works on your project following the steps below.
Revisions may occur after the delivery date.
2
Review requirements and confirm the scope of work.
2
Create wireframes or mockups (if required).