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Services · Build and integrate

Fintech app development, from discovery to production support

Product strategy, design and engineering for mobile apps, web portals and the APIs behind them, delivered in two-week cycles with working demos.

What is included

What you get.

Product strategy and discovery

Scope, user journeys, partner requirements and a delivery plan you can take to your board or investors.

UX and UI design

Interfaces for onboarding, payments and money movement, designed around the disclosures and consents your partner requires.

Mobile and web apps

iOS and Android apps, customer web apps, and admin or operations portals for your own team.

Backend, APIs and integrations

Ledgers, payment flows and integrations with banks, EMIs, card issuers, KYC vendors and core systems.

Testing and security

Automated tests, penetration testing coordination and the security evidence partners ask for in due diligence.

Cloud, DevOps and support

Infrastructure as code, monitoring, release pipelines and maintenance after launch.

Fintech app development has a constraint most software does not: someone else has to approve what you ship. A bank, EMI or card issuer will review your flows, your security and your records before a customer moves a single payment. We design and build with that review in mind from the first week, so approval becomes a step in the plan.

Fintech UX design for regulated products

Banking app design is mostly about trust and clarity. Users need to see balances they believe, fees before they pay them, and a clear status for every transfer. Partners need specific disclosures, consent screens and KYC steps in a set order. Our financial app UI design work starts with those requirements and then makes the journey as short as the rules allow. You receive design files, a component library and prototypes you can test with users.

Payment app development and API integration

Most of the engineering in payment app development sits behind the screen. We build the ledger, the payment state machine and the integrations with your licensed partners and vendors. Each integration sits behind its own adapter, which keeps your product independent of any one provider. Webhooks, idempotency and daily reconciliation are part of the first release.

For a fintech MVP we keep the scope narrow and the foundations complete. A small product with a correct ledger and clean audit logs can grow. A larger one without them usually has to be rebuilt.

Fintech web app development and operations portals

Customers see the app. Your team spends its day in the back office. We build web apps for customers and portals for operations, compliance and support staff, with role-based access and an audit trail of who did what. Your licensed partner can be given read access where its programme rules require it.

How the work runs

Every engagement follows the same steps: Discover, Design, Build and Launch. Discover takes 2 to 4 weeks and ends in a fixed quote. During Build you see a working demo every two weeks, on real infrastructure, so you can change direction early. Engineers work with AI-assisted tooling for tests, reviews and documentation, and senior engineers review every change.

If you want a fixed package with a launch at the end, see launch packages. If you need a module that already exists, our white label fintech platform can shorten the build.

What you own

You own the code, design files, infrastructure accounts and documentation for a product your licensed partner has approved for launch.

Questions

What clients ask us

What does fintech app development with Finoserv include?

It covers product discovery, UX and UI design, mobile and web apps, backend services and APIs, partner and vendor integrations, testing, cloud setup and support after launch. You can engage us for the full scope or for part of it, such as design only or a backend rebuild. Every engagement starts with a Discover phase that ends in a fixed quote.

Do you build React Native fintech apps?

Yes. We use React Native when one codebase for iOS and Android suits the product and the device features it needs. Where an app needs deeper native access, for example tap to pay on a phone or certain secure storage options, we write native Swift or Kotlin for those parts. The choice is made in Discover and written into the plan.

How do you handle API integration for fintech products?

We build a single integration layer between your product and each partner, such as a bank, EMI, card issuer or KYC vendor. It handles authentication, retries, webhooks and reconciliation, and it logs every call for audit. Adding or switching a partner later changes one adapter instead of the whole product.

The old rules of money. The new rails.

Talk to our team.

A new launch, an existing platform, a stuck project or a partnership. A senior member of the team replies within one working day.