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Stop Fixing Production Bugs. Start Finding Them First.

8h ago · 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

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

Mar 10 · 10 min read · Most fintech teams have good test coverage on their happy path. The payment initiates, processes, and settles. Tests pass. CI is green. Deployment proceeds. The problem is what happens in the other 40