Arun Kumar Das

I'm Arun Kumar Das, a Full Stack Developer specializing in the development of scalable, high-performance, and SEO-friendly web applications. I build complete digital solutions, combining modern frontend interfaces, robust backend systems, efficient databases, and reliable infrastructure to help businesses turn ideas into functional products.

My work spans SaaS platforms, business management systems, admin dashboards, content management systems, API-driven applications, and AI-powered solutions. I focus on writing maintainable code, designing efficient architectures, and building applications that are secure, responsive, and ready to grow with business requirements.

On the frontend, I work with React, Next.js, TypeScript, JavaScript, HTML, CSS, Tailwind CSS, and modern UI libraries to create responsive and user-friendly interfaces. On the backend, I build APIs, implement business logic, integrate external services, and manage data using technologies such as Node.js, Fastify, Python, FastAPI, PostgreSQL, MySQL, MongoDB, and Redis.

I also work with real-time communication systems, Socket.IO, WebSockets, payment gateway integrations, WhatsApp Business automation, subscription billing, and third-party APIs. My goal is to connect different services seamlessly and create practical solutions that improve business workflows and user experiences.

Beyond application development, I work with cloud infrastructure, Linux servers, Docker, Nginx, Git, deployment workflows, and performance optimization. I'm continuously expanding my knowledge of DevOps, cloud technologies, backend engineering, and automation to build reliable production-ready applications.

Core Expertise

• Full Stack Web Application Development

• Backend Development, REST APIs & Business Logic

• Frontend Development & Responsive UI Design

• Scalable Application Architecture & SaaS Development

• Real-time Communication with Socket.IO & WebSockets

• Database Design, Query Optimization & Data Management

• Third-party API Integration & Automation Workflows

• WhatsApp Business API & Communication Solutions

• Payment Gateway, UPI & Subscription Billing Integration

• Authentication, Authorization & Application Security

• Cloud Infrastructure, Deployment & DevOps

• Application Performance, Reliability & Technical SEO

Technologies & Tools

Frontend Development

HTML5 • CSS3 • JavaScript • TypeScript • React • Next.js • Astro • Tailwind CSS • Bootstrap • Zustand • shadcn/ui • Vite

Backend Development

Node.js • Express.js • Fastify • Hono • Python • FastAPI • REST APIs • WebSockets • Socket.IO

Databases & Data Management

PostgreSQL • MySQL • MongoDB • Redis • SQLite • Prisma ORM • Qdrant

DevOps & Cloud Infrastructure

Linux • Docker • Nginx • Git • GitHub Actions • PM2 • Cloudflare Workers • Cloudflare R2 • AWS

Development Tools & Integrations

GitHub • Playwright • Postman • Razorpay • OpenAI API • Third-party APIs • Payment Integrations

What I Do

• Develop and maintain scalable web applications.

• Design and implement backend APIs, database structures, and business logic.

• Build responsive, accessible, and user-friendly web interfaces.

• Integrate third-party APIs, payment services, and external platforms.

• Develop real-time features and communication systems.

• Create admin panels, dashboards, CMS platforms, and business management tools.

• Implement WhatsApp Business integrations and automation solutions.

• Deploy applications and manage production environments and server configurations.

• Troubleshoot technical issues and improve application performance and reliability.

• Collaborate with teams to translate business requirements into technical solutions.

• Apply security best practices, technical SEO, and performance optimization.

• Maintain existing applications and improve their scalability and maintainability.

My Development Approach

I believe successful software requires more than writing code. It requires understanding business goals, choosing the right technologies, planning a maintainable architecture, protecting application data, and optimizing the complete user experience. I prioritize clean implementation, efficient database queries, secure integrations, reliable deployment, and long-term maintainability.

Whether building a new product from scratch or improving an existing application, I aim to deliver practical, scalable, and performance-focused solutions that address real business needs.

Explore My Work

Explore my projects, development work, and digital solutions on my personal portfolio at Pluskode.com .