I build fast, reliable web applications
that help businesses scale.
Freelance Full Stack Developer & AI Engineer building fast, production-grade web applications, SaaS MVPs, automated business portals, and intelligent API workflows for startups and growing businesses worldwide.
// Freelance Full Stack Profile
constdeveloper = {
name: "Sumit Kumar Sinha",
focus: "Web Apps, SaaS & AI Workflows",
experience: "NexFMx India (Production Modules)",
stack: ["React", "Next.js", "Node", "PostgreSQL"],
turnaround: "Fast, communicative & reliable"
};
Selected Work & Projects
Real software systems engineered for business reliability, automated workflows, and sub-200ms API response times.
FinTech / SystemsFacility & Work Order Management Platform
Large-scale Facility & Work Order Management Platform with Survey Creation, Asset Tracking, File Management, Time Tracking, and Payroll workflows.
Web ApplicationEnterprise Task Management Application
Full-stack task management system with real-time status filtering, input validation, and PostgreSQL database integration via Prisma ORM.
What I Build for Clients
Product engineering solutions focused on reliability, intuitive user experience, and measurable business outcomes.
Custom Web Applications & Portals
Full-stack business applications, customer portals, internal management dashboards, and responsive web platforms built for speed and security.
SaaS MVPs & Product Engineering
Turn your product idea into a production-ready MVP with database architecture, billing integration, user onboarding, and automated deployment.
AI Integrations & Workflow Automation
Integrate OpenAI LLMs, intelligent document processing, invoice validation, and automated background workflows into existing business systems.
APIs, DevOps & Automated CI/CD
Reliable REST APIs, third-party webhook integrations, Docker containerization, and zero-downtime automated deployment pipelines.
How We Work Together
A clear, collaborative 4-step engineering process designed to eliminate guesswork, keep you in control, and deliver on time.
Discovery & Requirements
We discuss your product vision, target audience, technical scope, and core business goals to define clear milestones.
Architecture & UI Planning
I structure the database schemas, API routes, security boundaries, and responsive UI layouts before writing core code.
Agile Development & Testing
Fast, iterative development with regular preview updates so you can test features and provide feedback as they are built.
Production Launch & Support
Zero-downtime deployment to production servers, custom domain/SSL configuration, analytics setup, and 30 days of post-launch support.
Let's build something valuable.
Whether you need a full-stack web application, a SaaS MVP, an AI automation workflow, or a high-converting business portal, submit your project brief for a fast response.
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