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

Apr 4 · 9 min read · 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

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

Mar 28 · 8 min read · 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

Stop Fixing Production Bugs. Start Finding Them First.

Mar 21 · 7 min read · Every fintech engineering team I've worked with has a version of the same story. A transaction fails in production. A customer complains or — worse — doesn't complain and just leaves. The team scrambl

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

Mar 11 · 12 min read · 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

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

Mar 10 · 8 min read · 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