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Cover image for Architecting Subhams Secure Agent: Real-Time Cloud Printing with Node.js & WebSockets
Venkata Pavan Kumar Amarthaluri
Venkata Pavan Kumar Amarthaluri

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Architecting Subhams Secure Agent: Real-Time Cloud Printing with Node.js & WebSockets

#webdev #node #backend #security

Hello DEV Community! My name is Venkata Pavan Kumar Amarthaluri, and I am a Backend Software Engineer based in Andhra Pradesh, India.

Today, I want to share the architecture behind a project I recently engineered: the Subhams Secure Agent. (Inspired by my mother, Subbayamma Amarthaluri, I was incredibly excited to name my very first major suite of applications "Subhams" after her).

The Problem with Public Cloud Printing

In India, many people rely on local internet cafes or print shops to print highly sensitive documents, such as Aadhaar cards, PAN cards, and bank statements. Sharing these documents via WhatsApp or email leaves a permanent, highly insecure digital footprint on the shop owner's local hard drive.

I wanted to engineer a solution that allowed instant document transfer with a zero-disk-retention policy.

The Solution: Real-Time Sockets & RAM-Only Processing

Instead of building a standard REST API where files are uploaded, saved to a disk, and downloaded, I architected a real-time bridge using Node.js, Express, and Socket.io.

Here is how the infrastructure works:

  1. Instant Web Sockets: When a user uploads a document from their mobile device, it does not wait in a static database queue. The Socket.io connection instantly pushes the payload to the shop's terminal without requiring a page refresh.
  2. Volatile RAM Storage: The files are processed directly in the server's RAM. They are never written to a permanent disk space. Once the document is printed (or if the session is revoked), the data is permanently wiped.

Subhams Secure Agent Print Mobileview

  1. Hardware Fingerprinting: The agent ensures that the print job is only executed on authorized, verified hardware, closing the loop on physical security.

Subhams Secure Agent Print Dashboard
Subhams Secure Agent Print Dashboard

Why I Built This

I am a self-taught developer, and I believe the best way to master backend engineering is to solve real-world security vulnerabilities. Building the Subhams Secure Agent forced me to deeply understand memory management, real-time networking, and the MERN stack.

Let's Connect

I am actively expanding my knowledge in scalable system architecture and would love to connect with other developers or hear your feedback on the project!

Thanks for reading!

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