How to choose a fintech software development partner

A fintech software development partner should show experience with regulated products, a recognised security certification, careful data handling, senior engineers and clear code ownership. Financial products carry higher stakes than most software, so the checks go deeper. Start with the questions below before you compare prices.

Which regulations apply

Depends on what you build and where you operate. Payment products, lending, investment and banking-as-a-service each carry different rules, and the EU adds data protection law and operational resilience requirements. Your legal or compliance lead owns the interpretation. Your partner should understand the rules well enough to build for them and to explain what evidence an auditor will ask for.

What security evidence should you ask for

Ask for ISO 27001 certification, a description of access control, device management and offboarding, and how secrets and production access are handled. Ask where data is stored and processed. EU data residency and GDPR compliance simplify things for European fintechs.

Why does seniority matter more here

Mistakes in money flows are expensive. Senior engineers design for idempotent payments, reconciliation, audit trails and failure handling without being told. Junior-heavy teams tend to learn these lessons in production. Our guide to reviewing AI-generated code applies doubly when the code moves money.

How should the architecture be treated

Plan data separation early, especially if you serve several business customers from one platform; see multi-tenant architecture. Keep an event log of all state changes, write tests around the money logic first and keep third-party providers behind interfaces you can replace.

What should the contract cover

Include IP transfer, confidentiality, security obligations, incident notification times, audit cooperation and a way to replace people quickly. Agree that all code lives in your repositories. The checks in how to choose an offshore development team apply here as well.

How do you start

Begin with a small, well-bounded piece of the product, such as an internal tool or a single flow, and assess quality and communication before you expand. For a new product, see how to build a SaaS app.

How do you handle audits and incidents

Ask the partner how they support an audit: which logs, access records and change histories they can produce on request. Agree how fast they must tell you about a security incident, and who takes which action. Run a short tabletop exercise before launch, in which the team walks through a leaked credential or a failed payment run, so that the first real incident is not also the first rehearsal.

Which engineering practices should you expect

Expect code review on every change, automated tests around money logic, separate environments with no production data in development, and infrastructure defined as code. Expect the team to document decisions and to explain trade-offs in plain words. A partner who works this way makes audits shorter, onboarding faster and handovers safer, whichever provider you use. Ask to see a sample pull request and a runbook from a past engagement, with client details removed.

How do you compare partners

Score each candidate on the same questions: regulated experience, certification, seniority, access control, contract terms and references. Speak to two clients with similar products. The comparison usually becomes clear quickly, and the answers that lack detail tell you as much as the strong ones.

What this means when you hire through Miyagami

Every engineer is tested by an AI-native tech lead who works with AI every day. We hold ISO 27001, comply with GDPR and offer EU data residency. Engineers join your team full-time from €5,600 a month, with a shortlist within 3 working days and no recruitment fee. We replace at our cost if the fit is wrong, and we don't do part-time. See how we vet and pricing.

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