You're right to treat this as a high-stakes decision fintech isn't forgiving when things go wrong.
One thing I've noticed: most people evaluate development partners based on what they show, not how they work under pressure. That's usually where things break.
A few signals that are harder to fake:
• Ask how they've handled edge cases in payments or billing (failed transactions, retries, partial payments, refunds). If the answers are vague, that's a red flag. • Look at how they think about compliance early on (KYC, audit trails, data handling). Strong teams bring this up before you ask. • Instead of portfolio logos, ask for a walkthrough of a real system they built, how data flows, where failures happen, and how they monitor it. • Pay attention to whether they talk about trade-offs, not just "we can do everything."
Also, one underrated area in fintech projects is billing and subscription logic. It sounds simple early on, but it's where a lot of complexity shows up later, especially with pricing changes, retries, and revenue tracking. Teams that have actually dealt with this tend to think differently from day one.
If you find a team that can clearly explain what can go wrong and how they handle it, that's usually a stronger signal than any rating or review.
Curious to hear what others used as their deciding factor.