Top-Rated | Full-Stack Developer | React.js | Node.js | PHP | React Native | AI Specialist | WordPress
If your business is facing repetitive workflows, overloaded support teams, or software that cannot scale, I build AI-powered systems that automate processes, improve efficiency, and deliver better user experiences.
I am a Senior AI Full-Stack Engineer with 8+ years of experience building SaaS platforms, AI applications, and scalable products using LLMs, AI agents, React, Node.js, PHP, and cloud technologies. I help businesses transform ideas into reliable solutions that create measurable impact.
🏆 RESULTS I'VE DELIVERED FOR CLIENTS:
→ −60% support ticket volume · GPT-4o agent, CRM-integrated, multilingual, 24/7 for a SaaS company with 10,000+ users.
→ +40% average order value · AI recommendation engine trained on cart behaviour and purchase history.
→ 10,000+ users at launch · multi-tenant SaaS with isolated environments and Stripe subscription. billing.
→ 99.9% uptime · AWS auto-scaling, Redis, Docker, CI/CD, zero-downtime deployments.
👨💻 WHAT I BUILD:
✅ Senior Full-Stack Web Development (React · Next.js · Node.js · TypeScript)
✅ AI Agents, LLM Integrations & Intelligent Automation Systems
✅ SaaS Platform Architecture (multi-tenant · Stripe billing )
✅ Mobile App Development (React Native · Flutter · offline-first · real-time sync)
✅ CRM & Admin Panel Development (custom dashboards · analytics · reporting)
✅ E-Commerce Platforms (AI-driven recommendations)
✅ MVP Development & Legacy System Modernisation
⚛️ FULL-STACK TECHNICAL EXPERTISE:
FRONTEND
· React.js, Next.js 14 (App Router), Vue.js, Nuxt.js, TypeScript
· Tailwind CSS, Shadcn/UI, Radix UI, Framer Motion, Figma-to-code
· Real-time streaming UIs, LLM chat interfaces, PWAs, offline-first apps
BACKEND
· Node.js, NestJS, Express.js, Python, FastAPI, Django, Laravel
· REST APIs, GraphQL, WebSockets, microservices architecture
· Authentication: OAuth2, JWT, multi-tenancy, RBAC
DATABASES & CACHING
· PostgreSQL, MySQL, MongoDB, Firebase, Supabase
· Query optimisation, indexing strategies, database scaling
CLOUD, DEVOPS & INFRASTRUCTURE
· AWS (EC2, S3, Lambda, RDS, CloudFront), GCP, Azure
· Docker, GitHub Actions, CI/CD pipelines, Vercel
PAYMENTS & INTEGRATIONS
· Stripe (subscriptions, webhooks), Razorpay, PayPal
· HubSpot, Salesforce, Zoho CRM
· Twilio, SendGrid
· Google Maps API, Cloudinary, Firebase Push Notifications
MOBILE
· React Native & Flutter cross-platform, production-shipped apps
· Real-time sync, push notifications, GPS tracking, offline-first architecture
🤖 AI & AUTOMATION EXPERTISE:
I build real AI systems that reason, retrieve context, and take action, not basic API wrappers bolted onto existing products.
AI FRAMEWORKS & ORCHESTRATION
· LangGraph, LangChain, CrewAI, AutoGen, MCP (Model Context Protocol)
· OpenAI GPT-4o, Claude (Anthropic), Gemini Pro, LLaMA 3, DeepSeek.
RAG, VECTOR SEARCH & MEMORY
· ChromaDB, FAISS, OpenAI Embeddings
· Retrieval-Augmented Generation (RAG), semantic search.
VOICE & MULTIMODAL AI
· Vapi, Retell AI, ElevenLabs TTS, Twilio Voice autonomous inbound/outbound calling agents
· GPT-4o Vision, Gemini Multimodal, Document AI, Speech AI
AUTOMATION & WORKFLOW TOOLS
· n8n, Make (Integromat), Zapier
· LangSmith, eval pipelines, prompt optimisation.
🌐 INDUSTRIES I SERVE:
SaaS & Enterprise Software · E-Commerce & Marketplaces · Fintech & Payments
Healthcare & Telemedicine · EdTech & LMS · Real Estate Tech · Travel & Hospitality
🏆 WHY CLIENTS CHOOSE ME:
✔ Discovery first: I understand your business before writing a single line of code.
✔ Senior-level thinking: I design for scale, security, and maintainability from day one.
✔ Full ownership: backend, frontend, AI, cloud. One engineer, zero coordination overhead.
✔ Milestone-based delivery: live demos at every stage.
⚡ NDA-ready · Full IP transfer · 50 hrs/week availability
KEYWORDS
Full-Stack Developer | Front-End Developer | Back-End Developer | React.js Developer | Vue.js Developer | Next.js Developer | Node.js Developer | TypeScript Developer | JavaScript Expert | Tailwind CSS | Bootstrap | API Integration | REST API | GraphQL Developer | Web App Development | Responsive Design | Figma to HTML | WordPress Developer | Elementor Expert | WooCommerce | Shopify Developer | Custom Shopify App | Shopify Liquid | ACF | Headless WordPress | Payment Gateway Integration | Booking Website | ChatGPT Integration | OpenAI API | AI Chatbot Developer | AI Dashboard | LangChain | Claude Integration | AI Automation | Zapier Automation | Workflow Automation | React Native Developer | Flutter App Developer | Ionic App | Hybrid App Development | Mobile App with API | Cross-Platform App | Android/iOS Developer | Firebase Integration | Laravel Developer | FastAPI Developer | Supabase | MySQL | PostgreSQL | MongoDB Developer | Docker | CI/CD Pipeline | GitHub Actions | AWS Deployment | GCP Deployment| Cursor| Lovable| Claude
Web Development
React
Node.js
Laravel
PHP
AI Bot
Flutter
React Native
API Development
App Development
AI Implementation
ChatGPT API Integration
WordPress
Shopify
Angular
Chatbot Integration
Web Application
Firebase
AI Agent Development
Full-Stack Development
Suraj K.
Lucknow, India
$20/hr
4.9
26 jobs
✅ 𝟭𝟬𝟬% 𝗖𝘂𝘀𝘁𝗼𝗺𝗲𝗿 𝗦𝗮𝘁𝗶𝘀𝗳𝗮𝗰𝘁𝗶𝗼𝗻
🟢 I can help you with any WordPress-related task you request, from small bug fixes to custom theme development. Some of my services offered include:
⟶ HTML5, CSS3, SCSS, SAAS, JS, PHP, MySQL, jQuery
⟶ WordPress plugin development ( from scratch or Customize plugins )
⟶ WordPress theme development ( from scratch or with any themes )
⟶ Complete website setup
⟶ Theme customization
⟶ Custom plugin development
⟶ Woocommerce theme & plugin development
⟶ Elementor page builder, creating custom widgets and controls
⟶WordPress theme/plugin development & customization
⟶WooCommerce customization
⟶Shopify development & app Integrations
⟶Custom PHP and MySQL development
⟶ Website platform migration
⟶ Landing page design & development
⟶UI/UX & Responsive mobile-first design
⟶ Website speed optimization
⟶Email template design
If any of that is what you’re looking for, let’s talk!
I am available virtually 24/7 to my clients specially at US working hours (9 AM - 7 PM EST).
PSD to HTML
Responsive Design
CSS 3
HTML5
jQuery
JavaScript
WordPress
PHP
PSD to WordPress
Twitter/X Bootstrap
Mohit K.
Lucknow, India
$10/hr
4.8
94 jobs
Generative AI, LLM & RAG Solutions | AI Agents | Production-Ready AI SaaS Applications | Enterprise AI Architectures | React, Next.js, Node.js & Laravel | Cloud-Native AI Products
❇️ TOP-RATED Freelancer on Upwork
❇️ 9+ Years of Senior Full-Stack Engineering Experience
❇️ 70+ Successfully Delivered Enterprise & SaaS Projects
❇️ Elite Track Record with 12,500+ Logged Hours
👋 Hi, I’m Mohit Kumar Nigam. I help startups and businesses build production-ready AI systems, scalable SaaS platforms, and robust web applications. With 9+ years of experience and 70+ delivered products, I specialize in combining Full-Stack Engineering + Artificial Intelligence to launch secure, maintainable, and highly optimized software built for real production environments.
🤖 1. AI SaaS, LLM & RAG Engineering
I build practical, high-performance AI systems powered by modern Large Language Models, frameworks, vector architectures
• LLM Development: OpenAI (GPT-4o/o3-mini), Claude, Gemini, DeepSeek-R1, Prompt Engineering, LLM Integration.
• AI Agents: LangChain, LlamaIndex, CrewAI, vLLM, Multi-Agent Systems, AI Copilots, Workflow Automation.
• RAG & Vector DBs: RAG, Semantic Search, Embeddings, Pinecone, PGVector, Vector Search.
• Multimodal AI: Vision AI, Whisper, OCR, Document AI, Image Understanding.
• AI SaaS & Full-Stack: React, Next.js, Node.js, Laravel, REST APIs, Cloud-Native AI Applications.
💻 2. Full-Stack & System Architecture
I deliver clean-code architectures utilizing modern frontend frameworks and backend systems.
• Frontend: High-performance interfaces using React.js, Next.js, TypeScript, and Tailwind CSS.
• Backend & APIs: Secure architectures built on Node.js (NestJS/Express), Laravel (PHP), and Python (FastAPI).
• Databases & Caching: Robust data layers via PostgreSQL, MySQL, MongoDB, and Redis caching.
• SaaS Utilities: Multi-tenant infrastructure, Stripe billing, and secure OAuth 2.0/JWT authentication.
📱 3. Cross-Platform Mobile Apps
• Frameworks: Production-ready mobile engineering using Flutter (Dart) and React Native (TypeScript).
• Ecosystems: Firebase integration, local data syncing, and automated App Store / Play Store deployment
☁️ 4. Cloud, DevOps & System Architecture
• Cloud Infrastructure: Multi-region deployments across AWS (S3, EC2, Lambda, ECS), GCP, Azure, and DigitalOcean.
• Modern DevOps: Containerization via Docker, orchestration via Kubernetes, and automated GitHub Actions / GitLab CI/CD pipelines.
• System Operations: Ironclad auth (OAuth 2.0, JWT, MFA, RBAC), advanced APIs (REST, GraphQL, WebSockets), and Stripe multi-tier monetization.
🏭 Industries I Serve
• AI & Automation Startups | FinTech, Banking & InsurTech | Healthcare, MedTech & HealthTech
• E-commerce, Marketplaces & Retail | EdTech & E-Learning Platforms | Logistics, Supply Chain & Fleet Management
• Real Estate & PropTech | Hospitality, Travel & Booking | MarTech & Marketing Automation
• Enterprise ERP/CRM Systems | LegalTech & Document Automation | Cybersecurity & Identity Management
🏆 Why Premium Clients Partner With Me
• System Architect: I do not build temporary prototypes; I architect clean code optimized for business growth.
• Verified Elite Execution: 12,500+ hours tracking real software development with a 100% satisfaction record.
• Full-Time Dedication: Available 40+ hours per week, matching your business hours for live technical strategy
✨ LET'S BUILD YOUR PRODUCT
Ready to launch your SaaS platform, build an MVP, or integrate cutting-edge AI features? Let’s connect to map out a bulletproof technical strategy.
📩 Click the "Message" button on the right to start your project today.
KEYWORDS
Full Stack Developer | Frontend Developer | Front-End Developer | Backend Developer | Back-End Developer | React.js Developer | Vue.js Developer | Next.js Developer | Node.js Developer | TypeScript Developer | JavaScript Developer | JavaScript Expert | React Native Developer | Flutter Developer | PHP Developer | Python Developer | Django Developer | Mobile App Developer | SaaS Developer | ERP Developer | Web App Developer | UI/UX Design | CRM Developer | Tailwind CSS | Bootstrap | API Integration | REST API | GraphQL Developer | Web App Development | Figma to HTML | WordPress Developer | Elementor Expert | WooCommerce | Shopify Developer | Custom Shopify App | Shopify Liquid | ACF | Payment Gateway Integration | Booking Website | ChatGPT Integration | OpenAI API | AI Chatbot Developer | AI Dashboard | LangChain | Claude Integration | AI Automation | Zapier Automation | Workflow Automation | Flutter App Developer | Ionic App | Hybrid App Development | Mobile App with API | Cross-Platform App | Android/iOS Developer | Firebase Integration | Laravel Developer | FastAPI Developer | Supabase | MySQL | PostgreSQL | MongoDB Developer | Docker | CI/CD Pipeline | GitHub Actions | AWS Deployment | GCP Deployment | Cursor | Lovable | Claude
React
Node.js
Vue.js
Next.js
AI Development
AI Agent Development
AI Bot
LLM Prompt Engineering
PHP
Laravel
WordPress
Shopify
TypeScript
CRM Development
CRM Automation
API Development
ChatGPT API Integration
Supabase
Mobile App Development
Flutter
Ashraf Kamal S.
Lucknow, India
$30/hr
4.6
93 jobs
I help startups and businesses build Casino, Sports Betting, Poker, Multiplayer, and Gaming Platforms that are secure, scalable, and revenue-focused.
With 14+ years of experience, and 100% Job Success, I deliver high-performance web, mobile, and game solutions for global clients.
Expertise:
✔ Casino Platforms
✔ Sportsbook / Live Betting
✔ Poker / Multiplayer Games
✔ Unity Game Development
✔ Unreal Engine Development
✔ CSGO / Steam API Projects
✔ Mystery Box / Reward Platforms
✔ Wallet / Payment Integrations
✔ Admin Panels / Backoffice Systems
Tech Stack:
React.js, Node.js, Next.js, Laravel, PHP, MongoDB, MySQL, PostgreSQL, AWS, Docker, Unity, Unreal Engine, React Native, Flutter
Why Hire Me:
✔ Gaming industry expertise
✔ Clean scalable architecture
✔ Fast communication
✔ On-time delivery
✔ Long-term support
✔ Conversion-focused UI/UX
Clients Hire Me For:
✅ MVP to Full Product Development
✅ Existing Platform Upgrades
✅ Real-Time Systems
✅ API Integrations
✅ Dedicated Long-Term Developer
If you need an expert for Casino, Sports Betting, Unity, Unreal, Poker, or Gaming Platform Development, send me a message and let’s discuss your project.
Gambling
Unity
Counter Strike
AR & VR
Online Gambling Website
Card Game
Board Game
Unreal Engine
MetaMask
Mystery Box
iGaming
WebGL
Game Development
Gaming
Multiplayer
Game UI/UX Design
UI/UX Prototyping
Steam API
AI Development
PixiJS
Vipul S.
Lucknow, India
$5/hr
5.0
9 jobs
Hi,
I'm Vipul Singhal; I'm a full-stack Web Developer.
I have a Bachelor of Technology degree in Computer Science with over two years of experience.
I have worked as a frontend intern in companies like:-
1) Insellers
2) Best Roadways Private Limited
3)Odisoft Technology
Currently, I am working as a full stack developer and React Native Developer in Amcrest Technology
I provide modern solutions to web applications.
If you think I'm a good fit!!
I will like to hear from you.
Python
React
Firebase Cloud Firestore
React Native
AngularJS
Django
GitHub
Mohammad M.
Lucknow, India
$20/hr
4.7
45 jobs
Full Stack Developer — Angular, Vue.js, React.js/next.js , Node.js, Laravel | 7+ Years
I am a Full Stack Developer with 7+ years of experience building scalable and reliable web applications across eCommerce, healthcare, and education.
I work across the full development cycle — from planning and frontend development to backend systems, database design, API integration, and deployment.
I focus on clear communication, clean code, and consistent delivery. If there are changes or challenges during a project, I make sure to communicate them early.
What I Can Help You With
Custom web applications — SaaS platforms, dashboards, admin panels, CRM systems, job portals
eCommerce development — Magento, WooCommerce, BigCommerce (new builds, migrations, improvements)
API development and integrations — payment gateways, messaging systems, CRM, cloud services
Performance improvements for existing applications
Debugging and issue resolution for ongoing or inherited projects
Technical Skills
Frontend
Angular (2–20) · Vue.js (2/3) · Nuxt.js · Tailwind CSS · JavaScript · jQuery · AJAX
Backend
Node.js · Express.js · PHP (Core & OOP) · Laravel
Databases
MySQL · PostgreSQL · MongoDB
Payment Gateways
Stripe · Authorize.net · CCAvenue
Integrations
Twilio · SendGrid · Zoho · Amazon APIs
Tools and Workflow
GitHub · Bitbucket · Jira · Trello · Asana
How I Work
I have experience using tools like Claude, GitHub Copilot, and Cursor when they are helpful, while keeping the focus on practical experience and solid fundamentals.
I am comfortable both building projects from scratch and working with existing codebases. I take time to understand the current system and make improvements where needed.
A Good Fit If You Need
Someone who takes ownership of their work
Clear and consistent communication
Maintainable and well-structured code
A developer who can contribute to technical decisions when needed
Let’s Connect
If you have a project in mind — whether it is fully defined or still evolving — feel free to reach out. I would be happy to review your requirements and share my thoughts.
CodeIgniter
Laravel
Vue.js
AngularJS
Angular 6
jQuery
Firebase
MySQL Programming
MySQL
HTML
UX & UI
RESTful Architecture
Adobe Photoshop
Custom PHP
Vuetify
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