You will get Backend Development | Scalable APIs & Secure Systems
Top Rated
Project details
As an Experienced backend-focused developer, I will build a custom CRM system tailored to your business workflows, not a generic template.
I focus on delivering a scalable, secure, and production-ready CRM that helps you manage leads, automate sales, and improve team productivity.
👉 I handle the complete development cycle:
Discovery → System Architecture → Backend Development → API Integration → Testing → Deployment
👉 You will get a powerful CRM system with:
✔ Lead Management & Sales Pipeline
✔ Role-Based Access Control (Admin / Team / Managers)
✔ Custom Workflows & Automation
✔ Secure REST APIs & Database Design
✔ Performance-Optimized Backend
✔ Scalable Architecture (ready for growth)
I don’t just build software, I build systems that support long-term business growth and efficiency.
CRM Development, Custom CRM, Backend Developer, API Development, Node.js, SaaS, Lead Management, Sales Automation, PostgreSQL, System Architecture, Webhooks, RBAC, Scalable Backend
I focus on delivering a scalable, secure, and production-ready CRM that helps you manage leads, automate sales, and improve team productivity.
👉 I handle the complete development cycle:
Discovery → System Architecture → Backend Development → API Integration → Testing → Deployment
👉 You will get a powerful CRM system with:
✔ Lead Management & Sales Pipeline
✔ Role-Based Access Control (Admin / Team / Managers)
✔ Custom Workflows & Automation
✔ Secure REST APIs & Database Design
✔ Performance-Optimized Backend
✔ Scalable Architecture (ready for growth)
I don’t just build software, I build systems that support long-term business growth and efficiency.
CRM Development, Custom CRM, Backend Developer, API Development, Node.js, SaaS, Lead Management, Sales Automation, PostgreSQL, System Architecture, Webhooks, RBAC, Scalable Backend
Web Programming Project
API DevelopmentProgramming Languages
JavaScriptCoding Expertise
Localization, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$1,600
|
Standard
$2,800
|
Advanced
$3,900
|
|---|---|---|---|
| Delivery Time | 12 days | 20 days | 30 days |
Number of Revisions | 1 | 2 | 2 |
Source Code |
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NU
Nat U.
Jun 5, 2026
Xamarin developer to maintain and update existing app, payment integration work, conversion to MAUI
I had an excellent experience working with Karan.
He successfully upgraded our mobile application from Xamarin.Forms to .NET MAUI and handled both the mobile app and the associated .NET backend services. The project involved a number of technical challenges, but he consistently demonstrated strong problem-solving skills, attention to detail, and a deep understanding of the mobile and backend ecosystems.
Throughout the engagement, he was responsive, professional, and proactive in identifying issues before they became problems. The migration was completed smoothly, performance improved, and the application remained stable throughout the process. He also communicated clearly, provided thoughtful recommendations, and was easy to work with from start to finish.
If you're looking for a developer with strong expertise in .NET, MAUI, mobile development, and backend services, I would not hesitate to recommend him. I look forward to working with him again on future projects.
He successfully upgraded our mobile application from Xamarin.Forms to .NET MAUI and handled both the mobile app and the associated .NET backend services. The project involved a number of technical challenges, but he consistently demonstrated strong problem-solving skills, attention to detail, and a deep understanding of the mobile and backend ecosystems.
Throughout the engagement, he was responsive, professional, and proactive in identifying issues before they became problems. The migration was completed smoothly, performance improved, and the application remained stable throughout the process. He also communicated clearly, provided thoughtful recommendations, and was easy to work with from start to finish.
If you're looking for a developer with strong expertise in .NET, MAUI, mobile development, and backend services, I would not hesitate to recommend him. I look forward to working with him again on future projects.
JW
Jeremy W.
Apr 17, 2026
.NET MAUI Mobile Developer Needed for iOS/Android App
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Idan b.
Feb 22, 2026
SaaS Developer Needed for PayPal Integration and QA
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Prince R.
Feb 12, 2026
Full-stack dev to complete and optimize auditing app
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Nahar G.
Nov 18, 2025
Mobile app redesign
About Karan
SaaS Development Expert | Next.js, React, Node.js | MVP to Enterprise
93%
Job Success
Surat, India - 12:23 pm local time
I help startups and businesses build scalable SaaS products, MVPs and custom web applications that are designed for long-term growth, performance and maintainability.
✅ Services
• SaaS Product Development
• MVP Development for Startups
• Custom Web Applications
• Admin Dashboards & Internal Tools
• Subscription & Payment Systems (Stripe)
• API Development & Integrations
• Performance & Scalability Optimization
• Ongoing Product Development
💻 Tech Stack
React.js • Next.js • TypeScript
Node.js • .NET Core • Xamarin
PostgreSQL • MongoDB
AWS • Docker • Vercel
📈 Recent Results
• Built and launched multi-tenant SaaS platforms
• Developed subscription-based products with Stripe
• Created scalable APIs and backend systems
• Delivered startup MVPs in weeks, not months
• Built admin portals, dashboards, and business platforms
Why clients hire me:
✔ Top-Rated Upwork Freelancer
✔ 13+ Years of Full Stack Development Experience
✔ Clean, Scalable, Production-Ready Code
✔ Fast Communication & Reliable Delivery
✔ Strong Focus on Business Goals and User Experience
If you're looking for a developer who can understand both the technical and business side of your product, let's talk.
📩 Send me an invitation and let's discuss your project.
Steps for completing your project
After purchasing the project, send requirements so Karan can start the project.
Delivery time starts when Karan receives requirements from you.
Karan works on your project following the steps below.
Revisions may occur after the delivery date.
Requirement Analysis
Understanding your goals, features, and technical needs
Architecture Planning
Designing scalable backend structure & database