Biswas K.

Hi, I'm Biswas - a Senior Full-Stack Developer building scalable web applications for startups, agencies, and growing businesses. Throughout my career, I've helped turn ideas into reliable, production-ready products by designing maintainable systems, writing clean code, and focusing on solving real business problems. In addition to modern web development, I help businesses integrate AI capabilities into their products using Large Language Models (LLMs), Retrieval-Augmented Generation (RAG), and AI agents. Whether you're building a new AI-powered application or adding intelligent features to an existing platform, I can help design and implement solutions that fit naturally into your product and workflow. What I Can Help You Build * SaaS platforms, customer portals, dashboards, and internal business tools * Modern web applications using React, Next.js, Node.js, TypeScript, and Tailwind CSS * Secure REST APIs and scalable backend systems * Database design and optimization for high-performance applications * AI-powered applications using OpenAI and open-source LLMs * Retrieval-Augmented Generation (RAG) systems for private knowledge bases and business documents * AI agents and workflow automation for customer support, internal operations, and productivity * LangChain-based applications and LLM orchestration * AI features integrated seamlessly into existing web applications * Payment, authentication, analytics, and third-party API integrations — Stripe, Google Analytics (GA4), Sentry, EasyPost, USPS, UPS, FedEx, and more. My approach is simple: build software that is reliable, scalable, and easy to maintain. I believe clean architecture, thoughtful engineering, and clear communication are just as important as delivering features. Why Clients Work With Me * 10 years of professional software development experience * End-to-end ownership—from planning and architecture to deployment * Clean, maintainable, and production-ready code * Strong focus on performance, scalability, and long-term maintainability * Clear communication, reliability, and attention to detail * Business-first mindset focused on delivering real value—not just writing code Whether you're building a new SaaS product, modernizing an existing application, or adding AI-powered capabilities to your platform, I'd be happy to help bring your ideas to production. Let's schedule a quick call to discuss how I can help your project succeed.