Financial apps we build
Most fintech products sit on top of regulated partners: a sponsor bank, a banking-as-a-service platform, a card issuer processor, a broker-dealer or an insurer. The app has to respect each partner's rules while still feeling simple. These are the categories we work in most.
Digital banking
Account opening, balances, transfers, card controls, statements and in-app support, built on a core banking or BaaS provider's APIs.
Payments and wallets
P2P transfers, merchant payments, bill pay and stored-value wallets, with tokenized cards and Apple Pay or Google Pay provisioning where the issuer supports it.
Lending
Application flows, document upload, decisioning handoffs, e-signature, repayment schedules and hardship requests for consumer, BNPL and small business lending.
Wealth and investing
Portfolio views, order entry, recurring investments, goals and tax documents, with real-time market data and clear disclosures.
Insurance
Quotes, policy management, digital ID cards and claims with photo and video capture, connected to policy administration systems.
Security architecture for fintech mobile apps
We start each project with a threat model: who might attack the app, what they want, and which controls make that expensive. We map controls to the OWASP Mobile Application Security Verification Standard (MASVS) so your security team and any penetration testers share a common reference.
- Biometric authentication done properly: Face ID, Touch ID and Android BiometricPrompt unlock keys held in the Secure Enclave, Keychain or Android Keystore, rather than just toggling a boolean in the app.
- Device integrity signals: jailbreak and root detection, plus Apple App Attest and the Google Play Integrity API so your backend can judge whether requests come from a genuine app on a genuine device.
- Certificate pinning with a rotation plan: pin to public keys, ship backup pins, and agree who rotates certificates and when, so a routine renewal does not lock every user out.
- Step-up verification: extra checks for high-risk actions such as adding a payee, changing a phone number or large transfers.
- Data minimization on the device: no account numbers in logs or screenshots, secure flags on sensitive screens, and cached data encrypted and cleared on logout.
Payments, KYC and open banking integrations
Reducing PCI DSS scope
If your app or servers store, process or transmit card numbers, a large part of your infrastructure falls into PCI DSS scope. We design around that by using a payment provider's native SDK or hosted fields so raw card data goes straight to the provider and your systems only see tokens. That does not remove PCI obligations entirely, but it can shrink them considerably. Your qualified security assessor or acquirer confirms the final scope.
Identity verification and AML
Onboarding usually combines document capture, selfie liveness checks, database verification and sanctions and PEP screening through a specialist vendor. We integrate the vendor's mobile SDK, handle retries and manual review states gracefully, and keep raw identity images off our own systems wherever possible. Your compliance team owns the risk rules; we make sure the app and backend apply them consistently.
Open banking and data sharing
| Market | Framework | What to know |
|---|---|---|
| United Kingdom | Open Banking standards, overseen with the FCA | Account information and payment initiation run through FCA-authorized providers or aggregators |
| United States | CFPB personal financial data rights rule (Section 1033) | The rule's requirements and timelines have been subject to litigation and agency reconsideration; check current status before planning around it |
| Canada | Consumer-driven banking framework | Being phased in by the federal government; most apps use aggregators in the meantime |
| Australia | Consumer Data Right (CDR) | Accessing CDR data generally requires accreditation or working through an accredited intermediary |
Regulatory context by market
Financial regulation is set by many bodies: in the US, federal and state regulators plus FinCEN for AML; in the UK, the FCA; in Canada, FINTRAC and provincial regulators; in Australia, ASIC and AUSTRAC. Privacy law also applies, including UK GDPR, PIPEDA and the Australian Privacy Act. We are engineers, not your compliance function. We do not claim to be PCI DSS compliant, SOC 2 certified or licensed in any market. We build the evidence trail your partners expect: access logs, change history, secure SDLC records and test results.
How offshore fintech delivery is set up
- 1
Sandbox-first development
Engineers build against banking, payment and KYC vendor sandboxes. Production credentials live in your secrets manager and are never shared in chat or committed to repositories.
- 2
Synthetic financial data
We generate fake customers, accounts and transaction histories that include edge cases like reversals, chargebacks, negative balances and multi-currency activity.
- 3
Segregated duties
Developers do not deploy to production on their own. Releases go through pull request review, automated security scanning and an approval step owned by your team.
- 4
Partner due diligence support
Sponsor banks often send vendor questionnaires. We answer the parts that relate to our people and processes and give you documentation for the rest.
Whether you want a fixed-scope MVP or a long-running squad, the pros and cons of each engagement model matter more in fintech because partner reviews add unpredictable waiting time.
Common fintech app pitfalls
- Designing onboarding before confirming what the sponsor bank and KYC vendor actually require, then rebuilding it.
- Hard-coding a single certificate pin with no backup, which turns a certificate renewal into an outage.
- Calculating balances or fees in the app instead of trusting the ledger.
- Underestimating disclosures, accessibility and complaint-handling flows that regulators expect to be easy to find.
- Carrying an old, unmaintained codebase into a new partnership. Sometimes modernizing the existing app is the safer first step.
Choosing a technology stack
Native Swift and Kotlin give the most direct access to secure hardware and platform security APIs. Cross-platform frameworks are also viable: our Flutter team builds fintech apps with native modules for biometrics, attestation and secure storage. The right answer depends on your existing team and how much custom security work is needed. For a product with unusual flows, see how we approach custom app builds. If you would rather add engineers to your own team, you can also hire offshore mobile developers who have worked with payment and identity SDKs.