Liudas Jankauskas

Liudas Jankauskas

Rentgen.io nex-gen API testing tool

#92490912 followers 23 following

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About

I’m building Rentgen.io, a local-only next generation API testing tool that uncovers backend issues fast — no cloud, no telemetry, no vendor lock-in. Tested on real production APIs, including ChatGPT’s own backend, where Rentgen helped uncover issues that were fixed immediately. I write about quality strategy, API testing, and practical engineering principles. I care about tools that actually solve problems — not shiny dashboards or buzzwords. If you’re building APIs or care about reliability, I’m probably working on something useful for you.

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18h ago

Amazon API Testing: What 2 Minutes of Structural Analysis Revealed

We recently ran Rentgen against a simple production API endpoint responsible for updating a child profile.

No fuzzing. No custom scripts. No red team setup.

Just a real captured request and automated structural testing.

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6d ago

Testing Proton Pass API Without Knowing Its Architecture

I took a real Proton Pass API request straight from the browser and ran it through Rentgen.

No architecture knowledge. No configs. No scripts. Just import cURL generate tests wait a minute.

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25d ago

ChatGPT Telemetry Crashes on Invalid Input (Yes, Really)

Everyone says telemetry doesn t matter . Until it starts returning 500 Internal Server Error.