๐ Senior React & Next.js Developer | Web & Mobile Applications Development
๐ค Lovable Expert | Experienced Prompt Engineer
โก 6+ Years Experience
โข Top Rated Developer with 6+ years of experience
โข Completed 50+ Upwork projects with $40K+ in earnings & 2,000+ hours logged
โข AI-augmented โvibe coderโ using Claude, GPT, Cursor & Lovable/Bolt to accelerate delivery
โข Expert in React, Next.js, React Native & full-stack JavaScript systems
I am a software engineer who transforms ideas into scalable, high-performance web and mobile applications. My core goal is to deliver real value: high quality, timely delivery, and long-term maintainability.
Why work with me
- I bridge design and engineering: turning complex wireframes into flawless, user-centric applications
- I embrace โvibe codingโ โ combining AI tools (Claude, GPT, Cursor, Lovable) with expert judgment to reduce repetitive work, eliminate errors, and deliver faster
- I prioritize clear communication, structured milestones, and measurable outcomes
- I enforce rigorous testing & code reviews to ensure stability and bug-free delivery
My technical domain
Frontend: React.js, Next.js, TypeScript, JavaScript (ES6+), Tailwind CSS, Bootstrap, Vue.js
Backend: Node.js, Express.js, GraphQL, MongoDB, Supabase, Firebase
Mobile / Desktop: React Native, Electron.js
Tools & Workflow: Git (GitHub, GitLab), Postman, Swagger, Jest, VS Code, Chrome DevTools
AI Builder: Lovable, Bolt, Any
Core verticals & deliverables
- SaaS platforms, dashboards & admin tools
- E-commerce & marketplace applications
- Real-time data-driven web apps
- API integration & backend services
- Mobile-first, responsive interfaces
- Cross-platform mobile & desktop apps
Selected achievements (frontloaded attributes)
- Top Rated Developer on Upwork
- $40K+ in Upwork earnings, 2,000+ logged hours
- 50+ successfully delivered projects, many with repeat clients
- Recognized consistently for clean, maintainable code and dependable collaboration
Letโs collaborate
If you want to build from scratch, optimize an existing app, or scale your digital product, Iโm ready to engage. Click Invite so we can explore your projectโs next steps.
ExpressJS
JavaScript
PHP
React
HTML5
Laravel
MySQL
Node.js
Bootstrap
Vue.js
API Development
React Native
Supabase
Firebase
Framer
Md Humaon K.
Dhaka, Bangladesh
$30/hr
5.0
26 jobs
I'm a Top Rated Plus full stack developer with a 100% Job Success Score and around 9 years of experience building web apps that companies genuinely rely on every day. Those two badges aren't just decoration โ they mean every client I've worked with walked away happy enough to say so, and that's the standard I hold myself to on every project.
I work across the whole stack โ the React and Next.js side users interact with, and the Node.js and Laravel side keeping everything running underneath. So instead of hiring separate people for frontend, backend, and deployment, you get one developer who can carry your project from a rough idea all the way to launch.
A good chunk of my work has been in healthcare, so HIPAA compliance isn't a checkbox to me โ it's just how I build. When patient data is involved, the details matter: keeping PHI locked down, encrypting data in transit and at rest, setting up access controls so only the right people see the right things, and maintaining audit logs so there's always a clear trail. If your project touches patient information, that's one less thing you'll have to worry about explaining.
Here's what I work with:
Frontend: React.js, Next.js, TypeScript
Backend: Node.js, Nest.js, Express.js, PHP, Laravel, CodeIgniter
Databases: MySQL, MongoDB, DynamoDB
REST APIs: clean and documented, so other developers aren't left guessing
HIPAA-compliant healthcare apps: PHI protection, encryption, access control, audit logging
Payments: Stripe, PayPal, Google Pay, Apple Pay
Cloud & DevOps: AWS, DigitalOcean, Google Cloud, Docker, CI/CD, Git
What you get working with me is simple: clear communication, realistic timelines, and work that ships when I say it will. The Top Rated Plus status and 100% success score didn't happen by accident โ they're the result of treating every project like it matters, because to my clients, it does.
So if you've got something in mind โ a web app, a REST API, a payment setup, or a healthcare platform that needs to stay compliant โ send me a message and tell me about it. I'm happy to talk it through first, no pressure to commit.
ExpressJS
JavaScript
Amazon S3
Amazon DynamoDB
Amazon EC2
NestJS
Amazon Web Services
Laravel
Node.js
MongoDB
PHP
MySQL
API
RESTful API
AWS Lambda
Mashrafi A.
Narayanganj, Bangladesh
$10/hr
5.0
9 jobs
I'm a React Native Developer specializing in building fast, scalable, and production-ready mobile applications.
I help businesses develop new mobile apps, improve existing React Native applications, and solve performance bottlenecks that affect user experience.
My expertise includes:
โข React Native
โข JavaScript & TypeScript
โข React
โข Node.js
โข REST API Integration
โข Firebase
โข Redux Toolkit
โข React Query
โข Performance Optimization
โข Debugging & Profiling
I pay close attention to application performance and code quality. Whether it's reducing unnecessary re-renders, improving rendering performance, fixing memory-related issues, optimizing API interactions, or making the application more maintainable, my goal is to build software that performs reliably in production.
I believe communication is just as important as writing code. I keep clients updated, ask the right questions, and focus on delivering clean, maintainable solutions on time.
If you're looking for a React Native developer who values performance, reliability, and long-term maintainability, I'd be happy to discuss your project.
ExpressJS
JavaScript
React
React Native
TypeScript
Node.js
Redux
Mobx
MongoDB
PostgreSQL
Firebase
Next.js
MySQL
Software Architecture & Design
Md M.
Shaghatta, Bangladesh
$20/hr
5.0
3 jobs
I help businesses build fast, scalable web applications with Next.js and React that don't just work โ they grow with your business.
I'm a Full Stack Developer specializing in Next.js and the MERN stack, with over 4 years of experience building scalable, SEO-friendly, high-performance web applications. I help companies move from messy, hard-to-maintain codebases to clean, scalable architectures โ and I bring specific domain depth in warehouse management, logistics, and courier/parcel systems, so if your project touches inventory, shipping, or operations workflows, I already speak that language.
๐๐ก๐๐ญ ๐ ๐๐ฎ๐ข๐ฅ๐:
โ SaaS applications with multi-tenant architecture
โ Custom dashboards, admin panels, and ERP/CRM systems
โ SEO-optimized, high-performance Next.js websites and landing pages
โ E-commerce storefronts with admin + CMS
โ REST APIs, database design (PostgreSQL, MongoDB, Redis) and deployment (Docker, AWS, Vercel)
๐๐๐๐ก ๐ฌ๐ญ๐๐๐ค: Next.js, React, TypeScript, Node.js, Express, NestJS, PostgreSQL, MongoDB, Prisma, Redis, Tailwind CSS, Docker, AWS, Vercel
๐๐ก๐ฒ ๐๐ฅ๐ข๐๐ง๐ญ๐ฌ ๐ก๐ข๐ซ๐ ๐ฆ๐:
โ Performance-first โ strong Core Web Vitals and clean architecture by default
โ Type-safe, maintainable code you (or the next dev) can build on
โ Business-oriented โ I ship solutions that drive growth, not just features
โ Clear communication and reliable delivery (see my reviews below)
Available to start immediately. Message me with a short description of your project and I'll reply with exactly how I'd approach it.
Full Stack Developer | Next.js Developer | React Developer | Node.js Developer | TypeScript Developer | SaaS Developer | ERP Developer | CRM Developer | Full Stack Web Developer | Backend Developer | Frontend Developer | MERN Stack Developer | Web Application Developer | API Developer | Warehouse Management System | Logistics Software Developer
ExpressJS
JavaScript
Next.js
Full-Stack Development
React
Node.js
TypeScript
Tailwind CSS
PostgreSQL
MERN Stack
Web Development
HTML
CSS
SaaS
MongoDB
Web Application
Software Development
API Development
Front-End Development
Md. Abu M.
Bagerhat, Bangladesh
$40/hr
5.0
10 jobs
Full-Stack AI SaaS Developer building production B2B platforms where AI agents, Stripe billing, and multi-tenant architecture work together at scale. Top-Rated ยท $30K+ delivered ยท 5+ years building systems, founders scale without rebuilds โ including a healthcare SaaS at 1,000+ patients with zero payment incidents.
WHAT I BUILD
End-to-end SaaS platforms โ backend, frontend, AI agents, payments, infrastructure. Not a generalist who "also knows AI" or "also touches Stripe." A full-stack SaaS engineer whose AI and billing layers are the parts most teams underbuild.
โ Multi-tenant SaaS architecture with proper data isolation, RBAC, and tenant-aware billing
โ Subscription platforms with Stripe Billing โ plans, proration, dunning, usage-based metering
โ Marketplace platforms with Stripe Connect โ Standard, Express, and Custom accounts, deferred onboarding, split payouts
โ Production webhook infrastructure โ idempotency, retries, dead-letter queues, signature verification
โ Authentication, authorization, customer portals, and admin dashboards
โ API design (REST + tRPC) with rate limiting, auth, and proper error handling
AI IN PRODUCTION SAAS
AI features are now expected in B2B SaaS. I build them as core capabilities, not bolt-ons:
โ Custom multi-LLM agents that complete multi-step workflows (onboarding, form processing, support automation)
โ OpenAI and Claude API integrations with cost controls, retry logic, observability, and fallback handling
โ Multi-model routing โ the right LLM for each task (cheap models for classification, premium for reasoning)
โ Document-aware chat and RAG pipelines (pgvector), plus workflow assistants
โ Usage tracking and metered billing for AI features โ the Stripe Billing + AI metering integration most teams ship broken
I understand the business side of AI features โ token costs, latency, fallbacks, prompt observability, and how to bill for AI usage correctly.
PAYMENTS DEPTH
The Stripe billing layer is where most AI SaaS products break quietly โ subscriptions that don't update, metered events that go unreported, and webhook handlers that fail to process dispute events.
I've shipped production payment systems across 7 gateways โ Stripe (including Connect), PayPal, iXoPay, Dimoco, ACI Processing, emerchantpay, and PayBank2Bank. Real depth across subscription billing, usage-based metering, marketplace payouts, and webhook reliability.
RECENT WORK
โ catalyst-payment-app (B2B SaaS) โ Custom multi-LLM agent for payments onboarding automation. Multiple models are routed for adaptive multi-step form completion. Stripe Connect with deferred KYC and multi-gateway fallback.
โ Inoqare (HealthTech SaaS) โ Architected from zero. Multi-tenant healthcare platform serving 1,000+ patients with subscription billing and zero payment incidents in production.
โ Multi-step payment flow optimization (Marketplace) โ Custom checkout retention flow that lifted payment conversion by 35%.
โ Gateway integration optimization โ Diagnosed integration issues silently dropping conversions. +20% lift, pure infrastructure work.
โ Real-time SaaS platforms โ Twilio-based chat, voice, and custom invoicing with integrated billing.
INDUSTRIES
AI SaaS ยท B2B SaaS ยท HealthTech ยท FinTech ยท Marketplaces ยท Subscription platforms ยท Workflow automation
STACK
Backend: Node.js ยท NestJS ยท Express ยท TypeScript ยท PostgreSQL ยท MongoDB
Frontend: Next.js ยท React ยท Tailwind ยท shadcn/ui
AI: OpenAI API ยท Claude API ยท Multi-model agents ยท RAG / pgvector ยท LLM workflow integration ยท Prompt engineering
Payments: Stripe (Connect, Billing, Tax) ยท PayPal ยท regional gateways
Infrastructure: AWS ยท Vercel ยท Docker
Real-time: Twilio ยท WebSockets
HOW I WORK
โ Fixed price, fixed scope, fixed timeline โ no surprise hourly bills
โ Daily async updates (Slack, Loom, written) โ async-first, calls only when essential
โ Clean code with tests, docs, and deployment instructions
โ NDA from day one
Whom I WORK WITH BEST
โ AI SaaS founders building agent-based or LLM-powered products
โ B2B SaaS adding AI features that need to be metered and billed
โ Marketplace founders needing Stripe Connect done right
โ Existing SaaS with AI integration, billing, or webhook pain
โ Agencies needing a white-label AI + SaaS + payments specialist
If your project involves building an AI SaaS, integrating AI agents, shipping Stripe billing, or fixing payment infrastructure โ send me a brief. I'll respond within 24 hours with a decision on whether it's a fit.
ExpressJS
JavaScript
SaaS Development
Node.js
Web Application
Web Development
API
React
Next.js
TypeScript
API Development
NestJS
PostgreSQL
MongoDB
AWS Development
AI Development
Stripe
Payment Gateway Integration
Vercel
Rashedul I.
Noakhali, Bangladesh
$30/hr
4.8
12 jobs
Iโm a full-stack developer specialising in Next.js, Node.js, TypeScript, and Prisma, focused on building scalable SaaS platforms and high-performance web applications.
What I Can Do for You:
โข Build SEO-friendly, responsive frontend using Next.js + React.
โข Develop robust backend APIs with Node.js, Express, and TypeScript.
โข Design and maintain efficient databases using Prisma + PostgreSQL / MongoDB.
โข Implement subscription-based SaaS models: multi-tenant systems, authentication, dashboards.
โข Deploy apps using CI/CD, Docker, and Vercel or AWS for reliability and scalability.
Why Choose Me:
โข Reliability & Clean Code: I write clean, maintainable code with a strong focus on quality.
โข Problem-Solving: Iโm good at breaking down complex problems and delivering effective solutions.
โข Transparent Communication: I keep you updated at every stage and am committed to deadlines.
โข Scaling Focus: My solutions are built to grow โ whether youโre a startup or scaling up.
Letโs discuss your idea โ Iโll help turn it into a production-ready, scalable application.
ExpressJS
JavaScript
Node.js
React
MongoDB
Next.js
API Integration
Tailwind CSS
Redux
Redux Thunk
REST API
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