Ravi Gupta — Backend & AI Engineer

WRITING

Thoughts on backend engineering, system design, and the AI transition. Published on Dev.to, Medium, and Substack.

A Deactivated Admin Could Still Use Their Token. That's When Dual-Mode JWT Stopped Being About Speed.

What building cross-service RBAC taught me about the difference between a fast check and a correct...

pythonsecuritybackend

Jun 29, 20268 min read

Dev.to Medium Substack

I Almost Hashed a Document Number That Needed to Be Read Again

What building KYC verification taught me about the difference between encryption and hashing - and...

pythonbackendsecurity

Jun 23, 20266 min read

Dev.to Medium Substack

I Watched Money Move Twice From the Same Request. That's When I Understood Idempotency.

How a double-spend during testing taught me why financial systems treat duplicate requests as a...

pythonbackendredis

May 25, 20266 min read

Dev.to Medium Substack

I Started With a Blocklist. That Was the Wrong Instinct and VaultPay Taught Me Why.

What I learned building VaultPay's IP trust system and why the answer wasn't a blocklist VaultPay...

pythonbackendredis

May 18, 20267 min read

Dev.to Medium Substack

The Silent Failure I Never Saw Coming: What VaultPay Taught Me About Consistency Under Failure

VaultPay is a wallet microservice I built on top of AuthShield. This is the first technical post in...

pythonsoftwareengineeringbackend

May 13, 20268 min read

Dev.to Medium Substack

I Built AuthShield and Immediately Knew It Wasn't Enough

What happens when auth meets money - and what I learned building it Shipping AuthShield felt good...

pythonfastapibackend

May 6, 20265 min read

Dev.to Medium Substack

Everyone Talks About How to Build Secure Auth. Nobody Talks About What to Watch After You Ship It.

This is a bonus post in the AuthShield series - a production-ready standalone authentication...

pythonsecuritybackend

Apr 20, 202610 min read

Dev.to Medium Substack

I Thought the Hard Part Was the Code. Turns Out Production Is Where Security Assumptions Go to Die.

This is Part 4 of a 4-part series on building AuthShield - a production-ready standalone...

pythonsecuritydocker

Apr 13, 202610 min read

Dev.to Medium Substack

I Thought JWTs Were Stateless. Turns Out Logout Made Me Build a Stateful Layer Anyway.

This is Part 3 of a 4-part series on building AuthShield - a production-ready standalone...

pythonsecuritybackend

Apr 6, 20268 min read

Dev.to Medium Substack

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