Vansh P.

I’m a Full-Stack Developer focused on building production-ready web applications, mobile apps, REST APIs, and scalable backend systems. I work across the entire development lifecycle—from architecture and database design to backend development, frontend interfaces, mobile applications, integrations, deployment, optimization, and ongoing improvement of existing systems. I’m equally comfortable building a product from scratch or stepping into an existing codebase, understanding how it works, fixing problems, refactoring weak areas, and gradually improving its architecture without unnecessarily rewriting everything. Backend & APIs Technologies: - Node.js (Express.js, Fastify, NestJS) - PHP (CodeIgniter 3 & 4, Laravel, Symfony) - Java / Spring Boot - MySQL, PostgreSQL, SQLite - Redis I work with structured backend architectures, dependency injection, authentication and authorization, custom exception handling, interceptors, business events, caching, database design, migrations, transactions, indexing, and query optimization. I can build backend systems from scratch or work within existing APIs and codebases—refactoring legacy code, improving architecture, optimizing queries, fixing bugs, and adding new features safely. Frontend Technologies: - React.js, Next.js - Svelte / SvelteKit - JavaScript / TypeScript - HTML / CSS - Tailwind CSS, Bootstrap - Vanilla JavaScript, jQuery I have experience with SSR, API integration, authentication flows, HTTP-only cookies, access/refresh tokens, BFF architectures, state management, caching, responsive interfaces, and role/permission-based applications. I can also take an existing frontend and improve its structure, performance, responsiveness, maintainability, and user experience while working with the project's existing stack. Mobile Development Technologies: - Flutter / Dart - Android / Java - iOS / Swift & SwiftUI - Secure local storage - REST API integration I also have experience taking applications through the Google Play Store and Apple App Store release process, including Android AAB builds, iOS archives, TestFlight, signing, store metadata, privacy/data-safety requirements, and production deployment. I can build new mobile applications or improve existing Flutter/Android projects through debugging, optimization, refactoring, caching, API improvements, and new feature development. AI & ML Technologies & Areas: - OpenRouter - LLM APIs - AI-powered content generation - Structured AI/JSON generation I work with AI-powered application features and understand how to integrate LLMs into real products. I’m also actively studying ML and AI concepts with a focus on understanding how these systems work rather than simply consuming APIs. Integrations Technologies & Services: - OAuth & JWT - Social Signin (e.g, Google, Apple, etc.) - Payment gateways (e.g, Paypal, Paytm, Razorpay, Google and Apple Pay, etc.) - SMTP / Email - Microsoft services - REST APIs I can implement complete integrations across the frontend and backend, including authentication, authorization, token management, webhooks, error handling, validation, and data flow. I’m also comfortable troubleshooting and improving integrations that already exist in a codebase. Observability & Infrastructure Technologies: - OpenTelemetry - Git / GitHub - npm, Maven, Gradle - Linux - Cloudflare, Vercel, Render, Hostinger I have experience with manual OpenTelemetry instrumentation, tracing, custom decorators, spans, events, exception tracking, and application telemetry. I also work with production deployment environments and focus on practical infrastructure—keeping systems reliable, observable, performant, and cost-effective without adding unnecessary complexity. What You Get From Me ✅ Full-stack capability: Backend, frontend, mobile, databases, APIs, integrations, and deployment. ✅ Existing codebase expertise: I can understand, debug, refactor, optimize, and extend an existing project instead of immediately suggesting a rewrite. ✅ Clean architecture: Clear separation of responsibilities and maintainable code that can evolve with the product. ✅ Performance-minded development: Attention to database queries, API calls, caching, payload sizes, and overall application performance. ✅ Production-focused engineering: Authentication, security, error handling, scalability, deployment, and real-world edge cases. ✅ Practical problem solving: I focus on solving the actual engineering problem rather than forcing a particular technology or pattern. ✅ Long-term maintainability: I aim to leave every codebase cleaner and better structured than I found it. Whether you need an application built from scratch, a new feature implemented, an API designed, an existing system modernized, or a difficult bug tracked down and fixed, I can work across the stack and understand how all the pieces fit together.