Surbhit A.

I’m a full-stack developer who builds custom web applications, SaaS products, MVPs, marketplaces, and internal business tools using React, Next.js, Node.js, TypeScript, Supabase, and PostgreSQL. I’m Top Rated Plus on Upwork with $200K+ earned and 7,300+ hours worked. I can take a product from an early idea through architecture, development, testing, and launch. I also regularly take over existing applications that are unfinished, difficult to maintain, or started with another agency or AI development tools such as Replit, Cursor, Bolt, or Lovable. So whether you are starting from scratch or already have a repository that needs help, I can step in. What I build • Custom web applications, customer portals, admin panels, and internal tools that replace spreadsheets and manual processes • SaaS MVPs with authentication, user roles, dashboards, subscriptions, billing, notifications, reporting, and admin functionality • Marketplaces and booking platforms with customer and provider accounts, scheduling, availability, payments, commissions, and transaction workflows • React and Next.js applications with clean, responsive interfaces and production-ready backend integrations • Node.js and NestJS APIs connected to PostgreSQL, Supabase, MongoDB, or third-party services • Stripe integrations for subscriptions, one-time payments, billing portals, webhooks, and marketplace payment flows • Twilio Voice and SMS integrations for calling, messaging, notifications, verification, and communication workflows • REST APIs, webhooks, and third-party integrations with CRMs, payment platforms, scheduling tools, analytics systems, and other SaaS products • Business websites built with React or Next.js when performance, flexibility, and custom functionality matter Taking over existing applications A good part of my work involves projects where development has already started but something is preventing the product from moving forward. Maybe the previous developer disappeared. Maybe the MVP works but the code needs to be cleaned up before launch. Or maybe the application was built quickly using Replit, Cursor, or another AI-assisted development tool and now needs proper engineering before real customers start using it. I’m comfortable stepping into those situations. I normally begin by reviewing the repository, architecture, database, deployment setup, integrations, and current issues. From there, I separate what should be fixed immediately from what can stay as it is. I don’t believe in rewriting an application simply because I would have built it differently. If the existing code is usable, I work with it. If something genuinely creates a reliability, security, or scalability problem, I’ll explain why before changing it. Recent work One project involved more than 748 hours of development on a logistics software package, where the application had multiple workflows and business rules that needed to work together reliably. I’ve also built a custom quote builder using Replit, taking the initial application and turning it into a more structured product workflow. Another recent project involved implementing a complete full-stack SaaS application over five months, covering both frontend and backend functionality. I’ve also worked on Twilio Voice integration for a VoIP product, connecting calling functionality with the wider application and backend systems. My typical stack React, Next.js, TypeScript, JavaScript, Tailwind CSS, Node.js, NestJS, Supabase, PostgreSQL, MongoDB, Stripe, Twilio, REST APIs, Vercel, AWS, Git, and GitHub. How I approach development I like to understand the product before writing code. Who will use it? What is the main workflow? What needs to happen in version one, and what can wait? Which integrations are critical? Where does the data live? What could cause problems once real users start using the system? Once those questions are clear, I can recommend an architecture that fits the actual product rather than overengineering an MVP. During development, I focus on keeping the frontend, backend, database, APIs, authentication, payments, and deployment working as one system. I also pay attention to the less visible parts of development: error handling, database design, permissions, API failures, webhooks, validation, logging, performance, and maintainability. These are usually the things that determine whether an application keeps working after launch. For larger projects, I’m backed by the HestaBit team, including UI/UX designers, QA engineers, DevOps specialists, mobile developers, and additional frontend or backend developers. That means I can work directly as your full-stack developer for a focused build, while still having the ability to scale into a small product team when the project requires it. If you already have designs and specifications, I can start from there. If you only have the product idea, I can help turn it into a practical technical plan before development begins.