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It's been 10+ years working as a Full Stack Developer React Node (MERN Developer), specializing in React.js, Node.js, and Express.js, building SaaS platforms, MVPs, AI-powered apps, and enterprise web applications. 15+ years as a .NET Developer, past and current, giving me a rare depth in enterprise architecture that most React/Node developers don't have. $90K+ earned and 47 projects delivered on Upwork as a React MERN Developer and SaaS Developer, with a 100% Job Success Score and Top Rated status. 50+ SaaS platforms shipped as a Senior React MERN Developer, including multi-tenant architecture, subscription billing, and role-based access systems. 1,178+ hours delivered across full stack builds from early-stage MVP to production SaaS platform as a Full Stack Developer React Node. 700+ enterprise clients migrated from legacy .NET systems to modern React/Node.js stacks, drawing on 15+ years of .NET depth alongside 8 years of hands-on MERN/React/Node delivery. PhD in Computer Science, 14,000+ StackOverflow reputation, and an active GitHub presence since 2014 engineering rigor behind every SaaS Developer engagement. WHERE I DELIVER As a React Developer, component architecture, dashboard builds, and responsive UI for SaaS platforms and enterprise web apps, with 500+ production launches. As a MERN Developer, REST APIs, backend architecture, MongoDB database design, and secure, scalable systems as a Full Stack Developer React Node. As a React MERN Developer end-to-end SaaS builds from data architecture to polished frontend, including a UK fintech SaaS platform (account management, compliance, CRM, and payment tooling). As a Senior React Developer, AI-powered web application productionization, including auth, backend, AWS deployment, rate limiting, and monitoring for a live product. As a SaaS Developer, multi-tenant applications, workflow automation, and third-party API/payment integrations across healthcare, fintech, and logistics domains. As a .NET Developer with 15+ years of enterprise depth legacy system modernization and .NET-to-Node/React migration for teams replatforming older applications, backed by 8 years of hands-on MERN delivery on the other side of the migration. INDUSTRY IMPACT FinTech / SaaS: Built a UK-based fintech SaaS platform covering account and investment management, loan and insurance workflows, budgeting tools, compliance and fraud detection, and secure payments, as a React MERN Developer. Healthcare: I have worked on Medi Spack Platform, Medical Audit platform and Klinck Care as a React MERN Developer. E-Commerce / CRM: I have developed ShopisLive, 100000+ orders processed / 10000+ customers managed, as a Full Stack Developer React Node. AI-Powered Applications: EZPZ, AI SaaS Comission Platform, built with ChatGPT, Claude and Gemini AI Integrated and productionized on AWS as a Senior React Developer. Enterprise / .NET Modernization: 15+ years working across .NET systems, including Soley Cleaning, Solar4Goods, Cosmicfinite, now applied to migrating legacy platforms into modern React/Node architectures. HOW I BUILD - As a React Developer: React, Next.js, TypeScript, JavaScript, Tailwind CSS, Redux, responsive design, component-driven architecture. - As a MERN Developer: MongoDB, Express, React, Node.js, REST APIs, Redis. - As a SaaS Developer: multi-tenant architecture, subscription billing, Stripe/payment integration, Docker, AWS, CI/CD, Git. - As a .NET Developer (15+ years, past and current): C#, ASP.NET Core, Entity Framework, SQL Server, the enterprise foundation behind every migration and architecture decisions I make on the MERN side.

**FULL-STACK WEB/MOBILE DEVELOPMENT HEALTHCARE, AI SAAS, FINTECH** Hello! I'm Nazia, a Senior Full-Stack Developer specializing in Healthcare, AI SaaS, FinTech, and scalable Web & Mobile applications. With 4+ years of experience, I help startups, healthcare organizations, and growing businesses build secure, scalable, and production-ready digital products. From HIPAA-compliant healthcare platforms and telemedicine solutions to AI-powered SaaS products, FinTech applications, marketplaces, LMS platforms, and cross-platform mobile apps, I focus on delivering software that solves real business problems and scales with growth. ## SOLUTIONS I BUILD **Healthcare** * Telemedicine & Virtual Care Platforms * EHR / EMR / EPR Systems * Patient Portals * Practice Management Systems * Appointment Scheduling Platforms * ePrescription & Medication Management * Pharmacy Management Systems * Remote Patient Monitoring (RPM) * Healthcare SaaS Platforms * AI-Powered Healthcare Applications **SaaS & Business Applications** * Multi-Tenant SaaS Platforms * CRM & ERP Systems * LMS & EdTech Platforms * Marketplace Applications * Admin Dashboards & Internal Tools * Subscription & Membership Platforms **FinTech** * Digital Wallets * Payment & Stripe Integrations * Financial Dashboards * Banking & Investment Platforms * Secure Transaction Systems **Mobile Apps** * Cross-Platform Apps (iOS & Android) * On-Demand Service Apps * Booking & Scheduling Apps * AI-Powered Mobile Applications ## CORE EXPERTISE ✔ Full-Stack Web Development ✔ Healthcare Software & HIPAA Compliance ✔ AI SaaS Product Development ✔ FinTech Application Development ✔ EHR / EMR Integrations ✔ FHIR & Healthcare APIs ✔ React.js, Next.js & TypeScript ✔ Node.js, Express.js & REST APIs ✔ React Native & Flutter ✔ PostgreSQL, MongoDB & MySQL ✔ Multi-Tenant SaaS Architecture ✔ Cloud Infrastructure & Secure Authentication ✔ OpenAI, AI Agents & Workflow Automation ## TECH STACK **Frontend:** React.js, Next.js, TypeScript, Redux, Tailwind CSS, Material UI **Backend:** Node.js, Express.js, REST APIs, Scalable Backend Architecture **Mobile:** React Native, Flutter **Database:** PostgreSQL, MongoDB, MySQL **Cloud:** AWS, Secure Authentication, Role-Based Access Control (RBAC), Multi-Tenant Architecture **AI:** OpenAI, ChatGPT, AI Agents, Intelligent Assistants, Workflow Automation, Data Analysis ## WHY CLIENTS WORK WITH ME • Deep expertise in Healthcare, SaaS, AI, and FinTech products • Production-ready web and mobile application development • Secure, scalable, and maintainable architecture • Strong communication and transparent development process • Long-term support and reliable collaboration Whether you're building a Healthcare platform, AI SaaS product, FinTech solution, LMS, marketplace, or cross-platform mobile app, I'd love to help bring your idea to life. Let's build something secure, scalable, and impactful together.

Hi, I’m Arpan a Fintech expert. I help FinTech startups and financial platforms build secure, scalable, and integration-heavy products across banking, payments, lending, onboarding, and financial automation. I bring 15+ years of experience in FinTech product development and consulting, with hands-on work across Open Banking APIs, ACH flows, KYC/AML integrations, lending systems, and financial infrastructure. Clients usually work with me for three reasons: 1. Deep FinTech specialization I focus specifically on FinTech, which means I understand the product, compliance, integration, and operational complexity involved in building financial applications. 2. Strong integration experience I have worked with leading FinTech APIs and platforms such as Plaid, Dwolla, Finicity, Marqeta, Alloy, Onfido, Persona, Equifax, TaxJar, ADP, and others to build reliable and compliant user experiences. 3. Practical delivery mindset I help clients move faster by combining product thinking, technical execution, and real-world experience in security, privacy, and compliance-sensitive environments. What I can help you build : FinTech Product Development Services Banking App Development Digital Banking Platform Development Trading App Development Investment Platform Development Lending Platform Development Loan Origination & Loan Management Systems Payment Platform Development ACH & Payment Gateway Integration Embedded Finance Products Wealth Management Platforms Personal Finance Applications Financial Dashboard Development Expense Management Platforms Accounting & Payroll Integrations KYC / AML / Identity Verification Systems Banking API & Open Banking Integrations FinTech Mobile App Development Financial Web Application Development API Integration & Middleware Development Core integrations and platforms : Banking / Open Banking / Payments Plaid, Dwolla, Finicity, ACHQ, Marqeta, YapStone Lending / Credit / Servicing Encompass, Canopy Servicing Identity / Compliance / Risk Alloy, Certn, Checkr, Persona, Onfido, Equifax Investment / Trading Alpaca Stocks API Tax / Payroll / Back Office TaxJar, ADP Payroll, Paychex Tech stack : Front-end - Javascript, React, Angular, NextJS) Backend - .NET Core, Java, Nodejs, Python, Go, PHP Mobile - React Native, Flutter, iOS API Management - apigee, Mulesoft Cloud - Azure, GCP, AWS, Railway DevOps - Kubernetes, GIT, Jenkins, Artifact Registry, Argo Database - PostgreSQL, MySQL, Oracle, Mongo UI/UX - Figma, Framer Cache: Redis Cache, KeyCloak RBAC, OpenKM DMS Logging: ELK, EFK, Grafana Search: Apache Solr Firewall: Cloud Armor, GCP Baston Why clients hire me : Strong FinTech domain knowledge Experience with API-heavy financial products Security- and compliance-aware development Clear communication and reliable execution Ability to work from idea to production I’ve contributed to products in areas such as lending, payments, wealth management, tax workflows, freelancer finance, and financial wellness. If you need a developer who understands both FinTech product logic and technical execution, I’d be glad to discuss your project. Let's connect to discuss your Fintech Product.

I help startups and businesses build AI-powered SaaS platforms, marketplaces, and automation systems that reduce manual work and scale operations fast. I build production-ready web and mobile applications by combining 19+ years of hands-on development experience with AI-powered tools like Claude—shipping faster without compromising code quality, architecture, or UX. I also specialize in transforming outdated web apps into modern, AI-driven platforms with a clean, maintainable architecture so you’re not dependent on developers. for every small change. You’ll be able to handle minor updates yourself using AI tools like Codex or Claude. If you're looking for someone who understands both technology AND business outcomes, you're in the right place. 🚀 Core Expertise: AI-powered SaaS platforms Marketplace development (buyer/seller/admin systems) Business process automation Scalable backend architecture Custom dashboards & admin panels 🧠 How I Help You Whether you're launching an MVP or scaling an existing product, I can help you: ✅ Build your SaaS product from scratch ✅ Automate repetitive workflows using AI ✅ Develop secure and scalable backend systems ✅ Create seamless web & mobile applications ✅ Improve performance and reduce operational costs ⚙️ Tech Stack (Only What Matters) Mobile Application Development: We develop hybrid / cross-platform mobile applications using React Native CLI / EXPO, REDUX, and Flutter / Dart. PWA/progressive web application (React.js). Web Application Development: Full-Stack Development, Front-End Development, Back-End Development. MVP Development. SaaS development, Multitenancy Product Development. E-commerce & Social Media Websites. Front End Development: TypeScript, React.js, React remix, vite.js, Next.js, Vue.js, Nuxt.js, Tailwind CSS Back-end Development: Python (Django / flask / FastAPI), PHP (CodeIgniter / Laravel), Node.js (typescript), Express.js, Nest.js, fastify, Strapi Database: MongoDB, MySQL, PostgreSQL, SQLite, Amazon Redshift, MariaDB, AWS DynamoDB Tools & Technologies: Bitbucket, GitHub, Firebase, Websocket, Redis, Nginx, EC2, S3, RDS, and EBS (Elastic Block Store). 🤝 Let’s Work Together If you’re looking for: A reliable long-term developer Someone who understands business, not just code Fast execution with scalable architecture 👉 Let’s discuss your project. My experience spans various domains, as outlined below. 1. Asset management system: a web application and mobile applications for iOS and Android. 2. Location live tracking and WiFi data scanning: a web application and mobile applications for iOS and Android. 3. Habit-tracking mobile application for iOS and Android. 4. Retreat and hotel booking engine: Web Application. 5. Ticket booking system with live seat selection: web application. 6. Shipping container calculator: web application. 7. Job board mobile application and web application. 8. SaaS for hospital care and home care companies: web application and mobile application. 9. Courses booking system: A web and mobile application along with a scheduling system. E-Learning PWA: Learning languages and mobile app development. 10. SaaS for project management and task management. 11. Boutique hotel and retreat website designing. 12. Equipment rental e-commerce website development. 13. Event posting and chat system: mobile application development. 14. Development of a Bible reading mobile application with a subscription system, supporting Apple and Google Pay. 15. Dummy flight and hotel ticket booking website for visa applications. 16. SaaS for creating surveys and managing user responses. 17. Real estate website development with MLS grid integration. 18. SaaS for companies managing work assignments, customer invoicing, and task calendars. 19. Food delivery Mobile application. 20. Facebook Graph API, Instagram Graph API, Twitter API, and LinkedIn API data management. 21. Dating website development. 22. Classified listing website development. 23. Travel deals e-commerce website 24. Grocery delivery mobile application development. 25. E-commerce website for selling fine wines. 26. CV and resume creation web application. 27. Employee payroll management web application. 28. Loan management system web application. 29. scheduling system for booking home inspection appointments along with a payment gateway and connection with gohighlevel CRM. 30. revenue management system – pulls data from QuickBooks, the Mercury API and the Stripe API and calculates the revenue. 31. car and bike parts / equipment / marketplace / vendor-buyer concept. 32. SMS marketing system that is connected with Twilio 33. Developing an MVP using AI-based web application builders such as Lovable, Replit, Claude AI, Claude-assisted development and Cursor AI. Please send a message OR invite me to your job so we can schedule a Zoom meeting.

Senior Full-Stack Developer | React, Next.js, React Native | AI & SaaS Expert I help startups and founders build scalable web and mobile products that are secure, maintainable, and ready for real-world growth. With 10+ years of experience, I specialize in taking products from idea to production. I have delivered SaaS platforms, AI-powered applications, healthcare systems, fintech products, and enterprise solutions used by thousands of users worldwide. What I Bring to Your Project Full-Stack Expertise: End-to-end development from frontend (React, Next.js) to backend (Node.js, AWS) and mobile (React Native). AI Integration: Building AI agents, RAG systems, and automation workflows using OpenAI, Claude, and Base44. Scalable Architecture: Clean code, reliable delivery, and long-term technical ownership. Industry Experience: Healthcare, FinTech, Marketplaces, Delivery, Gaming, and Social Platforms. Core Tech Stack Frontend: React.js, Next.js, Vue.js, Angular, TypeScript, Tailwind CSS Mobile: React Native, Expo, iOS & Android Deployment Backend: Node.js, Express, Firebase, Supabase, PostgreSQL, MongoDB, AWS Payments & APIs: Stripe, RevenueCat, GraphQL, REST APIs, Webhooks Selected Projects TradeBulls: Trading platform supporting equities, derivatives, and commodities. Vuukle: Community platform serving millions of users globally. Store To Door: Same-day delivery platform with driver and dispatch workflows. iPass: Identity verification solution with OCR and liveness detection. Why Clients Work With Me - 10+ Years of Professional Experience - Production-Ready, Maintainable Code - Clear Communication & Reliable Delivery - Comfortable Taking Ownership of Existing Codebases - Long-Term Partnership Mindset Whether you need an MVP, AI-powered SaaS platform, or an experienced engineer to improve an existing product, I can help deliver a scalable solution that supports your business goals.

If you've built an app on Replit, Lovable, Base44 or Bolt.dev, I'm the guy who takes it across the finishing line. Over the past 2 years I've helped numerous entrepreneurs and startup founders take their application from their low code environment to production. I know quirks of each of these platforms and what changes to make to the application codebase to make it ready for go-live. Using a combination of Replit, Base44, Lovable and Bolt.dev I've cut down the development and launch time of MVP's and POC's from weeks to days and in many cases to hours. A bit about me, I'm a full stack developer and a cloud architect with 14+ years of experience in developing SaaS platforms, web applications, REST and Graphql API's for both web and mobile. As a cloud architect I also manage end-to-end software development cycle using git workflows, cloud deployment on AWS and Azure (using Docker and Kubernetes), maintenance, upgrade, and disaster recovery. I have the innate ability to understand current business process or software system and design and build new software system that vastly improves upon the current state. I can also act as your temporary CTO for your SaaS startup during the critical period when you’re trying to launch your MVP or get your platform off the ground. What type of development do I do: ********************************* New development: As a SAAS developer and cloud architect I specialize in developing mission critical and practical applications (SAAS or custom software) for both established businesses and startups. I have extensive experience in pure web application as well as cross platform applications and have built several high traffic, low latency applications (for both mobile and web) that need to scale very well in real time. SAAS prototyping for MVP: I can do rapid prototyping of SAAS platforms and being a SAAS developer with extensive experience I ensure quick turnaround in minimal time and budget. Auditing and taking over development and maintenance of existing platforms: I have extensive experience in taking over an existing web/mobile applications, audits it, work on improvements and maintain the for the owner. Domains/industries across which I have extensive expertise are: ************************************************************************ • SAAS platforms for real estate and mortgage companies • Real time stock market applications • Real time geo-location platforms • Background system • Social media platforms with very low latency • ERP, CRM, newsletter platforms for marketing Personal strengths: ********************** # I am very good at understanding and deciphering complex business logic and solve them programmatically. I also have very good knowledge of algorithms. # I have extensive experience in handling large MYSQL database with high volume traffic. I can write optimized sql queries and can audit sql queries to fix slow running queries. # I have practical and in-depth knowledge about code quality, various testing (unit testing, security testing, stress testing). I am very comfortable in setting up full stack application on bare-bone servers. I am also very comfortable working on terminal. # I have extensive experience in working in remote team and leading multi-member teams and managing source code through assembla and Bit Bucket. I am comfortable at working in both supervised and unsupervised environment. Below are some areas I have gained expertise over the years ********************************************************** Programming Languages: Python, Javascript, Node.js, PHP, Golang Relational database: MYSQL, PostGresql Nosql databases: Mongodb, Couchdb, Cassandra Nodejs frameworks: Express.js, Nest.js, Hapi.js Python frameworks: FASTAPI, Django, Flask Golang frameworks: Gorilla PHP frameworks: YII, CakePHP, Symfony2, Codeigniter Design tools: MYSQL workbench, Freemind, Visio, Pencil Internet protocols: HTTP, TCP/IP, SSL/TLS, POP3, IMAP I love to help people and am available for free 20 minutes consultation for most of the time. Drop me a message!