Fintech App Development

What a fintech app has to get right before anything else

Fintech software fails in ways ordinary apps do not. A retail app that goes down loses a session. A payments app that mishandles a card number, logs a plaintext account, or lets a role see balances it should not creates regulatory exposure, chargebacks and lost trust. Tepia treats a fintech build as a security and compliance project that happens to have a user interface, not a user interface that happens to move money.

The first design decision on any fintech app is scope minimization. Tepia keeps the primary account number, card data and other regulated fields out of your systems wherever the flow allows, so the surface a security team and an auditor have to examine stays small. Card data is tokenized through Stripe or Square and never stored on Tepia built servers, which keeps most engagements in the lighter PCI DSS self assessment scope rather than the full audit tier.

Tepia brings thirteen years of disciplined engineering to regulated software, including HIPAA aware healthcare builds where the same instincts apply: least privilege, audit everything, encrypt in transit and at rest, and assume the auditor will read the logs.

Fintech app types and the controls each one needs

Fintech is not one product. A neobank, a lending app, a robo advisor, a payments product and an insurtech tool share a compliance backbone but differ sharply in which integrations and controls dominate the build.

Across all five, Tepia builds role based access enforced on the server for every request, immutable audit logs for money movement and data access, and a double entry ledger with reconciliation against the rails when the product holds or moves balances. Tepia never leans on client side checks alone for anything a regulator would ask about.

Onboarding, rails and the ledger

The onboarding flow is where most fintech products win or lose users, and where compliance is heaviest. Tepia builds KYC and AML onboarding that collects only what the flow requires, verifies identity through a provider rather than storing raw documents longer than needed, and records each step for the audit trail. Bank connection and income or balance data come through Plaid and similar aggregation, so users link accounts without handing over credentials to your servers.

On the money movement side, Tepia works with ACH for bank transfers and tokenized card rails through Stripe and Square, keeping card data out of scope. Where the product holds balances, Tepia builds a ledger as the source of truth, with reconciliation jobs that compare the ledger against processor and bank records daily and flag any drift. Reconciliation that runs from day one is far cheaper than reconstructing history after a discrepancy.

Tepia also builds the operational surface that regulated products need but demos skip: penetration testing before launch, exportable audit logs your security team can route to a SIEM, and RBAC that maps to real roles such as customer, support agent, compliance reviewer and administrator. The systems integration page covers how Tepia connects to cores, custodians and processors.

How Tepia approaches fintech app development

Tepia runs fintech projects through its six phase process, with extra weight on the phases that protect regulated data. Discovery includes a system investigation of your existing cores, processors and identity providers, user interviews across customer and back office roles, and a third party integration review of Plaid, Stripe, Square and any core banking or custodian API. Deliverables are an Investigation Summary, an Interview Summary and User Stories that your compliance team can review before design begins.

Design produces a design questionnaire, moodboards, a style guide, and detailed wireframes for every role, including the compliance and support screens that consumer teams forget. Development and Testing runs on Alpha and Beta schedules with a written test plan covering functional, user acceptance and non functional testing, including load, security and reconciliation scenarios. Tepia arranges penetration testing before launch so findings are fixed before real money flows.

Training is a full phase for the operations and compliance staff who will run the product, built around real user story scenarios rather than a demo. Launch includes data migration, transition from any legacy system, and Tepia support reps on hand during rollout. A Tepia project manager is assigned to every engagement, and design and engineering leadership are US based. Details are at tepia.co/process.

Why regulated teams choose Tepia

Fintech buyers are choosing a team they will hand real customer money and regulatory exposure to, so the staffing model matters. Tepia is a US led studio with individually sourced global talent, not a body shop. Project management, design leadership and engineering leadership are US based, engineers are hand picked individuals who stay on the project, and the whole team works in US overlapping hours, which matters when a payments incident needs a same day response.

Tepia’s engineering leadership answers security questionnaires directly rather than routing them through a sales desk. That experience spans PCI DSS scoping, SOC 2 aligned practices, HIPAA aware architecture from healthcare work, and GDPR and CCPA data handling. The Newport Medical Solutions CIO described the difference this way: “We were impressed with Tepia’s genuine passion for their craft.”

If you are weighing a custom build against an off the shelf platform, the custom software development page explains where custom pays off. Full services are listed at tepia.co/services.

Frequently asked questions