You will get Full Stack MERN developer | React.js | Node.js | Next.js expert

Name: You will get Full Stack MERN developer | React.js | Node.js | Next.js expert
Availability: InStock

Tajinder S. Tajinder S.

4.9

Top Rated

Tajinder S. Tajinder S.

4.9

Top Rated

Project details

Greetings,

I'm an expert Full Stack developer, specializing in React JS, Node js, Express js, and Mongo DB with a strong grasp of HTML, CSS, Web app, AWS, Vue.js, API and integration of ChatGPT and OpenAI APIs.

I've successfully delivered over 1200 projects, excelling in MVP, SAAS and web development with PHP, Laravel, and Codeigniter. My portfolio includes diverse projects like Auction websites, E-Commerce platforms, Crowdfunding sites, and Job boards.

My service offerings encompass:
✅Full-stack Web Development with React, Node, PHP, Express js
✅MVP Development
✅Customization of third-party scripts from codecanyon
✅API Development
✅CRM solutions
✅Payment Gateway Integration
✅Third-party API Integration
✅Cpanel and server management

NOTE - The price is a placeholder. The exact estimate depends on the requirements.

Please send me a message before purchasing the gig. The exact price I will give you after the discussion.

Best Regards,
Tajinder Singh
Top-rated Plus full Stack expert

Full Stack Developer l React| AWS | Node| AWS| Express | Mongo DB | Front end development | Backend developmet

Programming Languages

HTML & CSS, JavaScript

Coding Expertise

Cross Browser & Device Compatibility, Performance Optimization, Design

What's included

Service Tiers	Starter $99	Standard $1,000	Advanced $3,500
Delivery Time	2 days	10 days	20 days
Number of Revisions	2	6	Unlimited
Number of Pages	1	5	10
Design Customization
Content Upload
Responsive Design	-
Source Code	-

Optional add-ons You can add these on the next page.

Fast Delivery

+$50 - $100

Frequently asked questions

4.9

171 reviews

95% Complete

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Bubble.io Expert Needed for Booking Portal

Bubble.io Developer Needed — Two-Sided Job Board App for Hospitality Industry

PLUGD.AI DEVELOPMENT BRIEF Best dev to work with on Upwork!!!

MVP Building I had a very good experience with Taj and his team. We worked on an early phase MVP that we were able to bring to life and I look forward to working with them again in the future.

About Tajinder

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Full Stack Developer | React / Next.js / Node.js | AI, SaaS, RAG, MVP

100% Job Success

4.9 (171 reviews)

Chandigarh, India - 7:03 am local time

Most AI SaaS products work well in demos but struggle under real-world usage. I build production-grade systems that scale reliably, handle edge cases, and meet the security and compliance requirements of regulated industries.

My experience spans AI-powered SaaS platforms, agentic workflows, Retrieval-Augmented Generation (RAG), healthcare integrations, and fintech infrastructure. I've helped startups and growing companies turn ideas into stable products that users can depend on.

What I Specialize In :
- SaaS Application Development
- MVP Development for Startups
- Full-stack development from architecture to deployment
- AI Agents, RAG systems, and LLM-powered applications
- SaaS MVP development and scaling
- Multi-tenant platforms with strong data isolation
- Healthcare integrations (HL7, FHIR, HIPAA-aware systems)
- Fintech platforms and compliance-focused infrastructure
- Technical leadership and fractional CTO support
- AI Integrations (OpenAI, LLMs, AI automation)
- Laravel & Node.js Backend Architecture
- React.js / Next.js Frontend Development
- API Development & Third-Party Integrations
- Workflow Automation (n8n, Zapier, Custom Automation)
- Stripe & Subscription Systems
- Cloud Deployment (AWS, DigitalOcean, Vercel)

Beyond Development :
I don't just build what's requested, I help identify the most effective technical solution before development begins. With 8+ years of experience leading architecture decisions and supporting founders as a technical partner, I focus on balancing speed, scalability, and business goals.

Proven Results :
Healthcare Infrastructure :
→ Built an HL7 gateway for HealthMosaic, endorsed by the VP of Enterprise Solutions at Fukuda Denshi USA.
→ Processes 10,000+ clinical messages daily from 200+ hospital monitoring devices.
→ Achieved 99% message delivery reliability.
→ Contributed to an estimated $400K annual operational savings.

Fintech Platform Development :
→ Developed a SEC Regulation CF-compliant backend for a U.S. fintech startup.
→ Delivered 248 automated tests with zero production defects at launch.
→ Designed secure, auditable infrastructure to support compliance requirements.

Technologies :
→ Frontend: React, Next.js, TypeScript, Tailwind CSS
→ Backend: Node.js, Python, NestJS, FastAPI, Express
→ AI/LLMs: OpenAI, Claude, LangChain, LangGraph, RAG, Vector Databases, AI Agents
→ Databases: PostgreSQL, MongoDB, Redis
→ Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD
→ Healthcare & Compliance: HL7, FHIR, HIPAA-aware architectures, Audit Logging

What Makes Me Different:
- 265+ successful projects delivered
- $300K+ earned on Upwork
- 20,000+ working hours (long-term client trust)
- Clean, scalable, production-ready code
- Clear communication & fast response

Industries I’ve Worked With :
• SaaS Platforms
• FinTech
• EdTech
• HealthTech
• Marketplaces
• CRM & Internal Systems
• AI-powered Applications

What clients say:
"Best dev to work with on Upwork!!!"
"I had a very good experience with Taj and his team. We worked on an early phase MVP that we were able to bring to life and I look forward to working with them again in the future."
"Tajinder was great to work with. He is easy to communicate with and explains everything in clear, simple steps, which made the whole process smooth. He is transparent, honest, and puts in genuine hard effort.

If you're building in AI, healthcare, fintech, or any SaaS where it has to work the first time, send me what you're building.

Let’s talk.

Thanks,
@Tajinder _ Full Stack Developer & AI Engineer | AI Agents, RAG, SaaS & Healthcare Systems

Keywords : Tajinder senior full stack developer Upwork | Full-Stack AI Engineer | SaaS MVPs, AI Agents & OpenAI Integrations | AI SaaS Developer | Next.js, Node.js, OpenAI, MVP Development | RAG Pipelines | AI Agents | Supabase | LangChain | Full Stack Developer| Full Stack Expert | Full Stack Specialist | React Developer| Node.js Developer| MERN Stack Developer| Backend Developer| React.js | Node.js| Senior Full Stack Developer| Full Stack Specialist | Full Stack Developer| Full Stack Developer Full Stack Developer| React.js Full Stack Developer| Full Stack Developer| Full Stack Developer| Node Full Stack Developer| Node Full Stack Developer| Full Stack Developer| full stack developer| MERN Full Stack Developer| Saas Full Stack Developer| React Full Stack Developer| AWS Full Stack Developer| Full Stack| Full Stack Developer| React Full Stack | Node.js Backend | Full-Stack AI Engineer | Claude API / OpenAI API | AI Integration | SaaS MVP Development ~ LLM / OpenAI API Development ~ AI Chatbot Development Startup Developer | API Integration | Automation Expert | n8n Developer | Replit | Claude | Lovable dev | Ai Website | Top rated plus Full stack developer

Hire best Full Stack Developer upwork for AI-Powered SaaS platform & MVP Development

#saas #mvp #aideveloper #react #node.js #next.js #bestdeveloper #fullstack #webapp #topratedplus

Steps for completing your project

After purchasing the project, send requirements so Tajinder can start the project.

Delivery time starts when Tajinder receives requirements from you.

Tajinder works on your project following the steps below.

Revisions may occur after the delivery date.

Requirement Gathering

Define strategy to complete the work

Review the work, release payment, and leave feedback to Tajinder.

Select service tier

Starter$99

Standard$1,000

Advanced$3,500

Starter Plan

3 hours work on the requirements.

Delivery Time 2 days
Number of Revisions 2
Number of Pages 1
- Design Customization
- Content Upload

2 days delivery — Jul 10, 2026

Revisions may occur after this date.

Upwork Payment Protection

Fund the project upfront. Tajinder gets paid once you are satisfied with the work.

You will get Full Stack MERN developer | React.js | Node.js | Next.js expert

Let a pro handle the details

Let a pro handle the details

Project details

Programming Languages

Coding Expertise

What's included

Frequently asked questions

ME

TM

TM

CH

BB

About Tajinder

Full Stack Developer | React / Next.js / Node.js | AI, SaaS, RAG, MVP

Steps for completing your project

After purchasing the project, send requirements so Tajinder can start the project.

Tajinder works on your project following the steps below.

Requirement Gathering

Define strategy to complete the work

Review the work, release payment, and leave feedback to Tajinder.

Select service tier

Starter Plan

You will get Full Stack MERN developer | React.js | Node.js | Next.js expert

Let a pro handle the details

Let a pro handle the details

Project details

Programming Languages

Coding Expertise

What's included

Frequently asked questions

ME

TM

TM

CH

BB

About Tajinder

Full Stack Developer | React / Next.js / Node.js | AI, SaaS, RAG, MVP

Steps for completing your project

After purchasing the project, send requirements so Tajinder can start the project.

Tajinder works on your project following the steps below.

Requirement Gathering

Define strategy to complete the work

Review the work, release payment, and leave feedback to Tajinder.

Select service tier

Starter Plan

Optional add-ons (1)