You will get secure backend APIs with .NET Core and SQL Server
Top Rated
Top Rated
Project details
You will get secure, scalable backend APIs built with ASP.NET Core and SQL Server, designed for real-world business workflows. This project is focused purely on backend development and is ideal for frontend teams, mobile applications, or systems that already have a UI in place.
I develop clean REST APIs with proper business logic, database integration, and performance optimization. The backend is structured for maintainability, security, and future growth. Whether you need new APIs, backend features, or improvements to an existing system, I focus on practical solutions without unnecessary complexity.
You will receive clean source code, optimized queries, and clear API structure that can be easily integrated with any frontend or client application.
I develop clean REST APIs with proper business logic, database integration, and performance optimization. The backend is structured for maintainability, security, and future growth. Whether you need new APIs, backend features, or improvements to an existing system, I focus on practical solutions without unnecessary complexity.
You will receive clean source code, optimized queries, and clear API structure that can be easily integrated with any frontend or client application.
Programming Languages
HTML & CSS, ASP.NET, C#Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included $100
These options are included with the project scope.
$100
- Delivery Time 5 days
- Number of Revisions 2
- Number of Pages 0
- Source Code
6 reviews
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NK
Nikhil K.
Jun 11, 2026
Existing Project (Expanzing Portal) – Angular 14 → 20 Upgrade, PrimeNG Upgrade & API Integration
Vaibhav exceeded our expectations on a challenging Angular modernization project. He successfully upgraded our application from Angular 14 to Angular 20, upgraded PrimeNG, resolved numerous compatibility issues, refactored deprecated code, and integrated multiple backend APIs without introducing regression issues.
His technical knowledge of Angular, RxJS, TypeScript, and enterprise application architecture was evident from day one. Rather than simply implementing requested changes, he proactively identified potential risks, suggested improvements, and helped us avoid future maintenance issues.
The quality of his code, attention to detail, and commitment to delivering a production-ready solution were outstanding. Communication was always clear, progress updates were consistent, and deadlines were met without compromise.
Vaibhav is a highly dependable full-stack developer who combines strong engineering skills with professionalism and accountability. We would confidently hire him again for future Angular, .NET, and enterprise application projects.
His technical knowledge of Angular, RxJS, TypeScript, and enterprise application architecture was evident from day one. Rather than simply implementing requested changes, he proactively identified potential risks, suggested improvements, and helped us avoid future maintenance issues.
The quality of his code, attention to detail, and commitment to delivering a production-ready solution were outstanding. Communication was always clear, progress updates were consistent, and deadlines were met without compromise.
Vaibhav is a highly dependable full-stack developer who combines strong engineering skills with professionalism and accountability. We would confidently hire him again for future Angular, .NET, and enterprise application projects.
NK
Nikhil K.
Feb 2, 2026
Senior Angular & .NET Core Full-Stack Developer (Ongoing Project)
Vaibhav delivered high-quality, production-ready solutions with a strong focus on clean architecture, performance, and maintainability. He quickly understood the existing system, suggested thoughtful improvements, and executed them efficiently. Communication was clear, timelines were respected, and ownership was evident throughout. I would confidently recommend him for enterprise Angular and .NET Core projects.
SB
S kumar B.
Jan 19, 2026
Asp Core
EN
Elias N.
Dec 29, 2025
Experienced Angular Full Stack Developer
Vaibhav consistently worked hard to deliver high-quality results and always met agreed-upon timelines. He is knowledgeable in Angular, .NET, and SQL, and was able to quickly understand requirements and implement solutions effectively. Communication was clear and responsive throughout the project, which made collaboration easy and productive. I would confidently work with Vaibhav again and plan to utilize his expertise on our next project.
LC
Laurentiu C.
Jan 8, 2025
Fullstack developer
About Vaibhav
AI-Native Full Stack Developer | Angular, .NET Core, React, Node.js
100%
Job Success
Nashik, India - 10:02 am local time
I help startups, agencies, and enterprises build, modernize, and scale production-grade web applications — from legacy system rescues to brand-new AI-integrated SaaS products.
With 5+ years of hands-on experience and 990+ hours delivered on Upwork, I've upgraded enterprise Angular apps across 10+ major versions (v9 → v21), built secure scalable APIs serving real business users, and shipped AI features (OpenAI / LLM integrations) that actually create value — not just demos.
🚀 WHAT I CAN BUILD FOR YOU
✅ Full-stack web applications (Angular / React + .NET Core / Node.js)
✅ AI-powered apps: chatbots, assistants, OpenAI API & LLM integrations
✅ SaaS platforms with multi-role dashboards, auth & subscriptions
✅ Angular version upgrades (v9–v21), PrimeNG/Kendo migrations, refactoring
✅ Secure, scalable REST APIs and microservices
✅ Real-time apps (SignalR, live tracking, notifications, maps)
✅ Legacy code rescue: performance fixes, architecture cleanup, tech-debt reduction
✅ Database design & optimization (SQL Server, Entity Framework Core)
🖥️ FRONTEND
✔ Angular (v9–v21) • TypeScript • React • RxJS
✔ Angular Material • PrimeNG • Kendo UI • Bootstrap • Tailwind CSS
✔ Responsive, mobile-first UI with clean UX
⚙️ BACKEND
✔ ASP.NET Core (C#) • Web API • Node.js • Express
✔ REST APIs • OData • Microservices • SignalR (real-time)
✔ Authentication: JWT, role-based access, secure workflows
🤖 AI & AUTOMATION
✔ OpenAI API / ChatGPT integrations (chatbots, ticket automation, smart workflows)
✔ AI-assisted features inside business applications
✔ AI-accelerated development workflow (Cursor, GitHub Copilot, Claude) — I ship faster without sacrificing quality
🗄️ DATA & CLOUD
✔ SQL Server • Entity Framework Core • Database performance tuning
✔ Microsoft Azure • Azure Functions • CI/CD pipelines
✔ Git, GitHub, code reviews, clean architecture
🏭 INDUSTRIES I'VE DELIVERED IN
✔ EdTech / E-Learning (multi-role learning platform with payments & dashboards)
✔ Healthcare & Delivery (real-time medicine delivery tracking with maps)
✔ Insurance & Logistics (domain-driven enterprise systems)
✔ HR & Workforce (attendance/leave management with selfie check-in)
✔ Support & Ticketing (AI-powered helpdesk automation)
💎 WHY CLIENTS CHOOSE ME
✅ Top Rated with 100% Job Success — every project delivered
✅ I work safely on LIVE production systems without breaking things
✅ Clean, maintainable architecture — no quick hacks that cost you later
✅ Clear communication, daily updates, 0–4 hour response time
✅ Long-term mindset: I build systems your team can grow on
⭐ WHAT CLIENTS SAY
"Vaibhav exceeded our expectations on a challenging Angular modernization project... resolved numerous compatibility issues, refactored deprecated code."
"Delivered high-quality, production-ready solutions with a strong focus on clean architecture, performance, and maintainability."
"Communication was clear and responsive throughout... I would confidently work with Vaibhav again."
📩 Whether you need to modernize an existing application, build a new product from scratch, or add AI capabilities to your platform — click "Invite to Job" or send me a message, and let's discuss the best approach for your project.
Keywords: Full Stack Developer | Senior Full Stack Developer | Angular Developer | .NET Core Developer | ASP.NET Developer | React Developer | Node.js Developer | AI Developer | AI Integration | OpenAI API | AI Chatbot | SaaS Development | Web Application Development | REST API Development | Angular Upgrade | Legacy Modernization | TypeScript Developer | SQL Server | Entity Framework Core | Azure Developer | Enterprise Web Applications | MEAN Stack | Full Stack Web Developer
Steps for completing your project
After purchasing the project, send requirements so Vaibhav can start the project.
Delivery time starts when Vaibhav receives requirements from you.
Vaibhav works on your project following the steps below.
Revisions may occur after the delivery date.
Backend Development
Develop APIs using ASP.NET Core with database integration.