Vellix Blog — Fintech Reliability & Test Engineering

I Tested 4 AI Tools for Payment API Test Case Generation. Here's What Actually Happened.

By Abhijeet Batsa Everyone is using AI to generate test cases now. That's table stakes in 2025. The more interesting question is: what kind of test cases are they generating? There's a difference bet

Apr 4, 20269 min read2

Every Type of Software Testing Explained — And Where AI Fits In

By Abhijeet Batsa, Founder of Vellix.io | 10 min read Software testing has more categories, subcategories, and frameworks than most engineers care to learn. This post cuts through the noise: what eac

Mar 28, 20268 min read9

Stop Fixing Production Bugs. Start Finding Them First.

By Abhijeet Batsa, Founder of Vellix.io | 7 min read

Mar 21, 20267 min read10

The 23 Fraud Vectors Most Fintech Test Suites Don't Cover

By Abhijeet Batsa, Founder at Vellix.io | Ex Paytm Money, Snapdeal, Rakuten There's a difference between a fraud detection system and fraud-resilient product logic. A fraud detection system watches l

Mar 11, 202612 min read3

What Is Financial Correctness Monitoring — and Why Uptime Metrics Miss It

By Abhijeet Batsa, Founder at Vellix.io | Ex Paytm Money, Snapdeal, Rakuten A payments platform I worked with had 99.9% uptime for eight consecutive months. Their SLA was met. Their monitoring dashbo

Mar 10, 20268 min read26

How to Test Payment Edge Cases in Fintech APIs — A Complete Guide

By Abhijeet Batsa, Founder at Vellix.io | 16 years at Paytm Money, Snapdeal, Rakuten

Mar 10, 202610 min read12

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