The Creator

Rathnavel Karthi is an independent product builder and developer who works across software, AI, automation, web applications and digital products.

He focuses on building practical technology that solves real problems — from the initial idea and product architecture through design, development, automation and deployment.

His approach combines engineering with product thinking: understand the problem, simplify the experience, build quickly, test in the real world, and keep improving.

Connect with Rathnavel Karthi on LinkedIn →

9bhk was conceptualized, designed, and developed by Rathnavel Karthi to solve the high-risk, fragmented vacation rental market across the Chennai and ECR coastline.

Built as a full-stack Next.js application, it integrates Razorpay checkout and signed payment webhooks, host-provided physical specs (electrical load kW, generator backup, and high-tide boundaries), and a strict three-bedroom group floor.