You will get new features into your live React, Next.js, and Node.js application ✔︎
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Project details
Need to add a crucial feature to your existing, live web application without disrupting service?
Jumping into an existing codebase requires skill and precision. I am a specialized Full-Stack Developer focused on seamlessly integrating new functionality into running React, Next.js, and Node.js applications. I ensure new features work smoothly with what’s already there, writing clean code that doesn't overcomplicate things.
How I Handle Feature Integration:
Frontend Updates: Enhancing your Next.js & React UI, implementing new components, and optimizing for performance.
Backend Adjustments: Modifying Node.js APIs, adjusting backend logic, and handling secure database updates if necessary.
Process & Quality: I prioritize smooth integration, rigorous testing, and clear, proactive communication throughout the task. You get a clean, maintainable codebase.
Core Stack: React, Next.js, Node.js, JavaScript/TypeScript, Git, REST API, GraphQL.
Let's get your new feature live quickly and safely.
👉 CONTACT ME NOW to share access to your codebase and discuss exactly what you need!
Jumping into an existing codebase requires skill and precision. I am a specialized Full-Stack Developer focused on seamlessly integrating new functionality into running React, Next.js, and Node.js applications. I ensure new features work smoothly with what’s already there, writing clean code that doesn't overcomplicate things.
How I Handle Feature Integration:
Frontend Updates: Enhancing your Next.js & React UI, implementing new components, and optimizing for performance.
Backend Adjustments: Modifying Node.js APIs, adjusting backend logic, and handling secure database updates if necessary.
Process & Quality: I prioritize smooth integration, rigorous testing, and clear, proactive communication throughout the task. You get a clean, maintainable codebase.
Core Stack: React, Next.js, Node.js, JavaScript/TypeScript, Git, REST API, GraphQL.
Let's get your new feature live quickly and safely.
👉 CONTACT ME NOW to share access to your codebase and discuss exactly what you need!
What's included $499
These options are included with the project scope.
$499
- Delivery Time 2 days
- Number of Revisions Unlimited
- Design Customization
- Content Upload
- Responsive Design
- Source Code
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Anton D.
Jun 18, 2026
Full Stack Developer with C# and React Expertise
great work!
TR
Tarun R.
Jan 8, 2026
Rewrite Node.js IoT Application to .NET with Enhanced Features
MM
Maxim M.
Dec 17, 2025
Continuous C# manufacturing pipe count app development
It was great working with Mohsin, He was able to undertand the problem right away, and provided solutions and improvements in a efficient and quality way. He was able to workin into an app that was left by a previous developer unfinished and finished it as required. Looking forward working again together on future projects.
MD
Marcel D.
Nov 19, 2025
AI-Powered Job Discovery Platform Development
No Feedback necessary
FV
Fabian V.
Aug 29, 2025
Document signing integration
Although we couldn't complete the work with this freelancer his conduct was always professional and his team showed they were very capable. Wish him the best for future endeavors
About Mohsin
AI & SaaS Pro | .NET/C# | Python | Next.JS | React | Node.JS | Cloud
100%
Job Success
Lahore, Pakistan - 11:44 pm local time
✔︎ Full Stack Expert: .NET Core | C# | Python | React | Node.js | AI Integration
✔︎ Specialized in SaaS, FinTech, HealthTech, ERP, CRM, Marketplaces, and Cloud Platforms
✔︎ AI-Powered Apps | Scalable SaaS Architecture | Production-Ready Full Stack Systems
Are you building a SaaS product, an AI-powered web application, an ERP system, or an enterprise platform that needs to scale fast, perform under pressure, and ship on time?
I design and deliver full-stack systems using .NET Core, C#, Python, React, and Node.js, handling everything from database architecture to cloud deployment, with clean code, full ownership, and zero shortcuts from day one.
𝐅𝐮𝐥𝐥 𝐒𝐭𝐚𝐜𝐤 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞
𖧹 .NET and C# Development: ASP.NET Core, .NET 6/7/8, MVC, Web API, Entity Framework, LINQ, Blazor
𖧹 AI and Automation: OpenAI API, LangChain, AI Agents, Chatbot Development, Prompt Engineering, AI-Powered SaaS Products
𖧹 Python Development: FastAPI, Django, REST APIs, Automation Scripts, Data Processing, AI and ML Pipeline Integration
𖧹 React and Node.js: ReactJS, NextJS (SSR/SSG), NodeJS, NestJS, ExpressJS, Angular, REST APIs, GraphQL APIs
𖧹 Frontend Engineering: TypeScript, Tailwind CSS, Material UI, Ant Design, Bootstrap, Framer Motion, Redux Toolkit, React Query
𖧹 Backend Systems: Microservices Architecture, gRPC, WebSockets, SignalR, Kafka, RabbitMQ, Event-Driven Design
𖧹 Databases and Caching: PostgreSQL, SQL Server, MySQL, MongoDB, Redis, Firebase, DynamoDB, Firestore, Schema Optimization, Indexing
𖧹 Architecture and Security: Multi-Tenant SaaS, RBAC, OAuth2, JWT, Secure Auth, Stripe API, Monolith to Microservices Migration
𖧹 Cloud and DevOps: AWS (EC2, Lambda, ECS, S3), Azure App Services, Azure Functions, Docker, Kubernetes, Terraform, CI/CD, GitHub Actions, GitLab, Vercel, DigitalOcean, Heroku
𖧹 Performance and Testing: Core Web Vitals, API Latency Optimization, Unit Testing, Jest, Cypress, Playwright, Mocha, PWA, SEO Optimization, Production Hardening
𝗥𝗲𝗰𝗲𝗻𝘁 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗧𝗵𝗮𝘁 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 𝗥𝗲𝘀𝘂𝗹𝘁𝘀
➜ BookedSolid | AI Appointment Automation SaaS
Tech: OpenAI, Twilio, Node.js, React, MongoDB
𖧹 Built an AI-powered booking engine with natural language scheduling via SMS and voice
𖧹 Automated end-to-end appointment workflows, cutting manual handling by 80%
➜ Renters / GetRenters | FinTech SaaS Platform
Tech: Next.js, Tailwind CSS, Node.js, AWS Lambda, MongoDB
𖧹 Architected lease management dashboards, workflows, and Stripe Connect payment integration
𖧹 Optimized all APIs for 40% faster load times, now actively serving 10,000+ users
➜ Ucardia | HealthTech and Wellness Platform
Tech: ReactJS, NestJS, Python, PostgreSQL, Redis
𖧹 Built a HIPAA-compliant clinician portal with real-time patient data streams
𖧹 Integrated wearable devices, automated health notifications, and a fully secure API layer
➜ DigitalSchools | EdTech ERP System
Tech: .NET Core, React.js, Azure
𖧹 Delivered a complete school management platform covering Admissions, Fees, Attendance and Multi-Tenant architecture
𖧹 Implemented enterprise-grade RBAC access control across all user roles and modules
➜ High-Traffic E-Commerce and Marketplace Platform
Tech: MERN Stack, Node.js, PostgreSQL
𖧹 Engineered a custom cart, payment gateway integration, and dynamic inventory management system
𖧹 Optimized fully for mobile, desktop, and high-concurrency production traffic
𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 𝗔𝗴𝗮𝗶𝗻 𝗮𝗻𝗱 𝗔𝗴𝗮𝗶𝗻
✔︎ End-to-End Ownership: I handle Architecture, Database, Backend, Frontend, Cloud, and Deployment myself
✔︎ AI-Ready Development: Every system I build is structured to integrate AI features today or in the future
✔︎ Clean and Strictly Typed Code: TypeScript, C#, Python, and Node.js, always maintainable and fully documented
✔︎ Scalable by Design: Multi-tenant SaaS, microservices, and cloud-native architecture from the ground up
✔︎ Transparent and Reliable: Daily progress updates, structured Agile workflow, no surprises, and no ghosting ever
Whether you are building a SaaS product, an AI-powered platform, an ERP or CRM system, a FinTech application, a HealthTech dashboard, or a high-traffic marketplace, I deliver production-tested, enterprise-grade solutions built for real-world scale and long-term growth.
Send me a message so we can discuss.
Full Stack, MERN Stack, MEAN Stack, .NET, ASP.NET Core, C#, Blazor, MVC, Web API, Python, FastAPI, Django, Node.js, NestJS, ExpressJS, ReactJS, Next.js, Angular, Vue.js, TypeScript, Tailwind CSS, Material UI, Ant Design, Framer Motion, Redux Toolkit, React Query, Context API, REST API, GraphQL, gRPC, WebSockets, SignalR, MongoDB, PostgreSQL, MySQL, SQL Server, Redis, DynamoDB, Firestore, Kafka, RabbitMQ, Microservices, Multi-Tenant SaaS, OAuth2, JWT, RBAC, Stripe API, OpenAI API, LangChain, AI Agents, AWS, Lambda, EC2, S3, ECS, Azure Functions, Azure App Services, Docker
Steps for completing your project
After purchasing the project, send requirements so Mohsin can start the project.
Delivery time starts when Mohsin receives requirements from you.
Mohsin works on your project following the steps below.
Revisions may occur after the delivery date.
Development process