Custom Software Development
Software built around how your business actually works — internal tools, dashboards, portals and workflow automation, from first idea to production.
I'm Alapan Das, a freelance full stack developer and founding engineer. I help startups and businesses design, build and ship custom software: SaaS products, web applications, APIs and AI-powered features, handled end to end from architecture to deployment.
Software built around how your business actually works — internal tools, dashboards, portals and workflow automation, from first idea to production.
Go from idea to a launch-ready product fast. Auth, billing, multi-tenant architecture, role based access and an admin panel, built to scale after launch.
Fast, SEO-friendly web apps with Next.js, React, TypeScript and Tailwind CSS, with a clean backend behind them.
REST and GraphQL APIs with NestJS, Node.js, Express or Django, on PostgreSQL, Supabase and Redis. Includes third-party integrations and payment gateways.
Add AI to your product: OpenAI and open-source LLMs, RAG with vector search (pgVector), LangChain pipelines, chatbots, and fine-tuning with LoRA/QLoRA.
Dockerised deployments on AWS and Vercel, CI/CD pipelines, monitoring and performance tuning, so your app stays fast and available as usage grows.
A free call to understand your goals, users, constraints and timeline.
A clear scope, tech stack, milestones and estimate before any code is written.
Weekly demos and a staging environment so you see progress and give feedback early.
Production deployment, documentation, handover and ongoing maintenance if you need it.
Tell me what you're building. I'll reply with next steps and a rough estimate.
Get in touch