Mansi M.

Full Stack Developer | React | Next | Node.js | Python & AI Expert

Looking for an experienced Full Stack Developer to build fast, scalable, and secure web applications? I help startups, SaaS companies, and enterprises develop high-performance web applications using modern technologies, including React.js, Next.js, Node.js, Express.js, TypeScript, JavaScript, Python, PostgreSQL, MongoDB, and AWS. With over 10 years of experience, I've successfully delivered MVPs, SaaS platforms, AI-powered applications, enterprise solutions, admin dashboards, marketplaces, and scalable APIs designed to support thousands of users. Whether you need to build a product from the ground up, develop a responsive React frontend, create a robust Node.js backend, integrate third-party APIs, optimize application performance, or implement AI-powered features, I deliver clean, maintainable, and production-ready solutions focused on long-term scalability and business growth. → Core Expertise : 1. Custom Web App Development (React, Next.js, Node.js, Django, Flask) 2. API Development & Integration (REST, GraphQL) 3. Database Design & Optimization (MongoDB, PostgreSQL, MySQL) 4. AI & Automation Solutions (OpenAI API, Python scripting, chatbots) 5. Performance Optimization, Code Refactoring, and Security Hardening 6. UI/UX Implementation with responsive, accessible frontends 7. DevOps & Cloud Deployment (AWS, Vercel, Docker, CI/CD) → Services I Offer 1. Full Stack SaaS & Cloud Application Development Full-stack web development using React.js, Node.js, and Python (Django/Flask) for scalable frontend and backend solutions. Cloud-based architectures with AWS, DigitalOcean, and Heroku for reliable performance and growth. SaaS development including subscriptions, dashboards, analytics, and reporting features. REST & GraphQL API development for seamless integrations and efficient data handling. Focus on performance, security, and maintainable code for enterprise-ready applications. 2. UI/UX Design & Prototyping Wireframes, Figma prototypes & responsive UI implementation Mobile-first, SEO-optimized, Core Web Vitals-friendly designs UX decisions backed by data to boost conversions 3. Modern Backend & API Engineering Node.js, Laravel, Django REST APIs, GraphQL Authentication: JWT, OAuth2, Firebase Auth, Auth0 Microservices architecture, caching, real-time syncing 4. Marketplaces & Multi-Vendor Platforms Custom vendor portals, onboarding flows, inventory tools Secure payments (Stripe Connect, PayPal, Apple Pay) Order tracking, real-time alerts, and review systems 5. Payments & Automation Stripe, PayPal, Apple Pay, Braintree integration Subscriptions, invoicing, automated refunds & reporting Webhook-based workflow automation 6. Database Architecture & Optimization Relational (PostgreSQL, MySQL) & NoSQL (MongoDB, Firebase) Scalable schemas, optimized queries, migrations Caching strategies for high-traffic systems (Redis, Memcached) 7. Third-Party & Microservice Integrations CRM (Salesforce, HubSpot), Email (Klaviyo, Mailchimp) ERP, POS, analytics, and payment systems Event-driven architecture & API-first integrations → Tech Stack Expertise 1. Custom Full-Stack Web Application Development – Using React.js, Next.js, Node.js, Django, and Flask to build scalable, high-performance web apps. 2. API Development & Integration – Designing and integrating RESTful APIs, GraphQL APIs, and third-party services for seamless data flow. 3. Database Design & Optimization – Expertise in MongoDB, PostgreSQL, MySQL, ensuring efficient queries, indexing, and scalability. 4. AI & Automation Solutions – Implementing OpenAI API, Python scripting, machine learning, chatbots, and workflow automation for smarter applications. 5. Performance Optimization & Security Hardening – Code refactoring, backend optimization, caching strategies, and robust security best practices. 6. Responsive UI/UX Development – Building accessible, mobile-first, interactive frontends with React.js and modern design principles. 7. DevOps & Cloud Deployment – Deploying applications with AWS, Vercel, Docker, CI/CD pipelines, and containerized cloud infrastructure. 8. Full-Stack SaaS & Enterprise Solutions – Architecting multi-user platforms, dashboards, admin panels, and enterprise-grade software using React + Node + Python. 9. Real-Time Applications – Implementing WebSocket-based features, notifications, chat systems, and live dashboards for dynamic applications. 10. Scalable, Maintainable, Future-Proof Architecture – Designing modular, testable, and high-performance full-stack solutions for long-term business growth. → Let’s Build Something Impactful Let’s talk! I’ll help you ship fast, scale reliably, and build full-stack web applications using React, Node.js, and Python that drive growth and deliver results. 📩 Message me today to turn your idea into a scalable, high-performance, and revenue-ready product.