Banking Software Development

Challenges in banking software

• Account opening that takes days and paper forms
• Mobile banking experiences that lag behind fintech competitors
• Core banking systems that are difficult to integrate
• Manual loan processing and document collection
• Strict regulatory, audit and vendor-risk requirements

Software we build for banking

Compliance and security

We build the technical controls these rules require and work with your compliance and legal advisers, who confirm obligations.

Systems we integrate with

Vendor due diligence

Banks and credit unions must assess every technology vendor. We support due diligence with documentation of our security practices, access controls, development process and data handling, and we work within your environments and policies — including your cloud, identity provider and change-management process — rather than requiring access to production data.

The regulatory landscape for banking software

Software that touches banking data operates under overlapping rules, and requirements depend on your charter, products and partners. Commonly relevant frameworks include:

• Gramm-Leach-Bliley Act (GLBA) — safeguarding customer financial information.
• FFIEC guidance — examiner expectations for information security, authentication and outsourcing.
• PCI DSS — whenever card data is stored, processed or transmitted.
• BSA/AML and KYC — identity verification, transaction monitoring and suspicious-activity reporting.
• Third-party risk management guidance — banks must oversee vendors, including software partners, through the relationship life cycle.
• Section 1033 open banking rules — consumer data access requirements being phased in by the CFPB.

We build software that supports compliance — audit trails, access controls, encryption, data retention — and work alongside your compliance and legal teams, who own the interpretation of these rules.

Working with core banking platforms

Most US banks and credit unions run on core platforms from a small number of providers such as Fiserv, FIS and Jack Henry. Modern customer experiences are usually built around the core rather than by replacing it: a middleware or API layer exposes accounts, transactions and customer data to digital channels, while the core remains the system of record. We design these integration layers with caching, idempotent operations and reconciliation so digital products stay responsive even when core batch windows or vendor APIs are slow.

Typical projects

Security architecture for financial applications

Banking applications need layered defences: strong customer authentication with phishing-resistant multi-factor options, encryption in transit and at rest with managed keys, least-privilege access for staff, segregation of duties for sensitive actions such as payment approvals, and immutable audit logs that examiners can review. We also plan for resilience — tested backups, disaster recovery objectives agreed with the business and incident response procedures — because availability is part of trust in financial services. Independent penetration testing before launch and at regular intervals completes the picture.

Reference architecture for digital banking add-ons

Banks and credit unions rarely replace their core. Digital initiatives succeed when they sit in a clean layer above it, so new experiences can change quickly while the system of record stays stable.

A digital account-opening project, step by step

1. Define products and policy1–2 weeks

   Agree which products are in scope, eligibility rules and the KYC and CIP evidence your compliance team requires.

2. Select providers2–3 weeks

   Choose identity verification, document and funding providers that your risk team approves.

3. Design the flow2–4 weeks

   Mobile-first screens tested with members or customers; minimise fields and explain why data is needed.

4. Integrate and build10–16 weeks

   Connect the core, identity verification, funding and e-signature; build exception queues for staff.

5. Test controls2–4 weeks

   Security testing, accessibility review and compliance sign-off on disclosures and record-keeping.

6. Phased launch

   Release to staff and a small group first, monitor abandonment and fraud signals, then open widely.

Buy, extend or build

Common mistakes in banking technology projects

• Starting development before the core provider confirms API access, cost and limits
• Underestimating vendor due diligence and change-management lead times
• Treating accessibility as optional for digital channels
• Building fraud and identity checks in-house instead of using approved specialist providers
• Running reports directly against the core during business hours

Each of these adds weeks or months; addressing them in discovery is far cheaper than discovering them during user acceptance testing.

Questions to settle before you start

• Which core APIs are licensed today, and what does additional access cost?
• Who in compliance and information security signs off each release?
• Which approved vendors can we use for identity, fraud and e-signature?
• Where must the application be hosted, and under whose cloud account?
• How will member or customer support handle cases the digital flow cannot complete?

For broader financial products, see our fintech software page and identity and access management services.

Making digital journeys accessible and inclusive

Bank and credit union customers include people of every age, ability and level of digital confidence. The Americans with Disabilities Act applies to many financial institutions’ services, and courts and regulators increasingly expect websites and apps to be accessible; WCAG 2.2 Level AA is the standard most organisations target. Beyond legal risk, an inaccessible onboarding flow simply loses customers.

• Screen-reader friendly forms with clear labels and error messages
• Sufficient contrast and text that resizes without breaking layouts
• Time-outs that warn users and let them extend sessions
• Alternatives to CAPTCHA and image-only identity steps
• Plain-language explanations of fees, terms and disclosures
• Support for other languages where your community needs it

We test with automated tools, keyboard-only navigation and screen readers on iOS, Android and desktop, and we include accessibility acceptance criteria in every user story rather than auditing at the end. Inclusive design also means providing a clear path to a person — a branch, call centre or secure message — whenever a digital journey cannot be completed.

Operating the software after launch

A banking application is never finished at go-live. Regulations change, providers update their APIs, fraud patterns shift and customers expect continual improvement. We plan operations from the first sprint: monitoring and alerting tied to your incident process, regular dependency and security updates, periodic access reviews, and release notes that support your change-management records.

Where your team will operate the software, we provide runbooks, architecture documentation and a handover period so knowledge stays inside the institution.

Banking terms we align on before building

Metrics for digital banking programmes

• Application completion and abandonment by step
• Time to fund new accounts
• Share of service requests completed digitally
• Call volume for issues the app could resolve
• Accessibility defects found and fixed per release

A 90-day plan for a first digital banking improvement

A practical first project is usually one high-friction journey, such as small-business account opening. We spend the first weeks mapping the current steps and the bank’s vendor-review requirements, build the new journey against core and KYC sandboxes, run a staff-only pilot, and then release to a limited customer group with completion and abandonment tracked at every step.

Many banks also run insurance or wealth products — see insurance software development.

Services for this industry

See also fintech software, enterprise integration and cybersecurity engineering.

Explore more in Industry Software Development for the Sectors We Serve.