Fintech Software Development Company: Custom Financial & Banking Software Development

Updated September 2026 · Written and maintained by the Progression Agency strategy team

Progression Agency is a fintech software development company building custom financial software for fintech startups, lenders, credit unions, wealth and payments businesses: customer onboarding, account and transaction apps, lending workflows, payment integrations and financial dashboards, engineered for security, auditability and the regulators your product answers to. Fintech software developers on a project like this need to be as comfortable with ledgers, reconciliation and audit trails as with screens, since the product is trusted only if the numbers always agree.

What is fintech software development?

Fintech software development is designing and building custom software for financial services: applications and platforms that handle payments, accounts, lending, investing, insurance or financial data, with the security, accuracy and regulatory controls that money requires.

Most fintech products combine a customer-facing app with partner infrastructure, a banking-as-a-service provider, payment processor, card issuer or data aggregator, and a back office for operations, support and compliance. We build all three layers and the integrations between them. Custom fintech software development beats a white-label platform only when much of your differentiation lives in the product. For vendors selling fintech solutions software development services, the first question is who owns the code and the integrations.

Financial software we develop

Our fintech software development services span consumer products, B2B platforms and internal finance tools.

Digital banking and wallet apps

Account views, transfers, cards and statements, built on banking-as-a-service partners or core banking APIs. For wallet products, see our e wallet app development page.

Payment platforms and integrations

Card, ACH and real-time payments, payouts, subscriptions and marketplace money flows. For a gateway of your own, see payment gateway development.

Lending software

Applications, document collection, decisioning integrations, servicing portals and collections workflows.

Credit union and community bank software

Member onboarding, loan applications and financial-wellness tools integrated with core systems; see our credit union work.

Investment and wealth tools

Client portals, portfolio reporting and advisor dashboards.

Wealth management software: when a custom build fits

A package suits most advisory firms until their process stops matching its screens. Typical triggers are a client portal that cannot show held-away assets the way advisors explain them, a wealth management app that carries another company’s brand and roadmap, or a wealth management CRM with no room for household structures, fee schedules and compliance reviews. A custom build can sit on custodian data feeds and your existing portfolio system, adding only what the packaged tools leave out.

Venture capital software for deal flow and reporting

Funds usually start with a packaged venture capital CRM, and that is fine while the work is tracking founders and introductions. A custom layer starts to pay off when deal data, capital calls, portfolio metrics and limited partner reports live in separate tools and someone reconciles them by hand each quarter. We build that layer on top of what the team already uses, with permissions for each partner and an audit trail for every number that reaches an investor.

Insurance and insurtech

Quoting, policy and claims workflows; see insurance software development.

Finance operations automation

Reconciliation, reporting and approval workflows that replace spreadsheets.

Member onboarding, loan applications and financial-wellness tools integrated with core systems; see our credit union work.

Finance software development company work for accounting and finance teams

Not every finance project is a banking product. Many buyers come to a finance software development company for the systems their own finance team runs on: reconciliation tools that match bank and processor records to the ledger, approval workflows for invoices and payments, reporting that pulls figures from several systems, and billing or invoicing portals for customers.

The starting point is usually the accounting system and general ledger already in use. A good build connects to it through its integration interfaces instead of replacing it, keeps an audit trail on every change and approval, and separates who can prepare, approve and release a payment. Those controls are what auditors and lenders ask about, so they belong in the first release, not a later phase.

Scope the first version around one painful workflow, such as month-end reconciliation, and measure hours saved and errors caught before widening it. The security and compliance section below covers the controls that apply to financial data.

Accounting software development: what a build has to get right

Accounting software development depends on accuracy and traceability: every transaction needs a clear record, totals must reconcile and changes need an audit trail showing who did what and when. Define the chart of accounts, tax handling and reporting needs early.

Plan the connections to banks, payment processors and existing ledgers, and test with real data before launch. Decide how corrections, closing periods and user permissions work, since those rules are hard to add later.

Bank software development and mobile banking app development

Bank software development covers the systems around the core: online and mobile banking, onboarding and identity checks, payments, reporting and integrations with the core processor. Mobile banking app development adds device security, biometric login and push alerts, and it has to pass the bank’s own security and vendor reviews. When you compare a banking software development company, ask who has shipped regulated financial software, how audit logs and access control are designed, and how the team works with your compliance staff.

Community bank mobile app: building beyond the vendor template

Most begin as the digital banking vendor’s standard product with the bank’s logo on it. That keeps cost and risk low, and it also leaves the bank offering screens much like those of its neighbors. Custom work is worth discussing when the bank wants something that reflects how it actually competes: business owners approving payments from a phone, a relationship manager visible in the app, or farm and commercial features regional rivals lack.

The build depends on what the core processor and digital banking platform expose, so we check those interfaces first and then scope either a companion app or specific modules. Small institutions also run lean IT teams, so support, release timing and who answers an overnight outage belong in the plan from the start.

What features does fintech software need?

Trust features matter as much as the product feature itself. A fintech dashboard is where that trust shows: balances, pending items and fees must match the ledger exactly, which is why teams move off templated admin panels as volumes grow.

Crypto banking software, BNPL app development and buy now pay later apps

Crypto banking software development joins a bank-style account experience to digital assets, and crypto banking app development has to handle custody, identity checks and rules that vary by state. BNPL app development covers the checkout offer, credit decision, repayment schedule and collections. A buy now pay later app development company should describe its approach to disclosures, refunds and late payments, and buy now pay later app development projects usually need a compliance review early.

Which financial systems do we integrate?

Fintech products are integration-heavy by design.

Security and compliance for financial software

Which rules apply depends on the product and your partners. We map them before design. RIA software, for example, has to meet the books and records rules for investment advisers, a requirement that often decides whether a packaged tool is enough or a custom archive is needed.

• PCI DSS when card data is stored, processed or transmitted.
• KYC and anti-money-laundering programs, typically operated with your bank partner.
• Federal consumer-finance rules overseen by the CFPB.
• Gramm-Leach-Bliley Act privacy and safeguards requirements.
• SOC 2 evidence for enterprise and partner due diligence.
• State licensing requirements for money transmission and lending, confirmed with counsel.

Our fintech development process

We map every money flow and partner first, design a ledger and permissions model, build in sprints with high automated test coverage, run threat modeling and penetration tests, and launch with monitoring and fraud controls. A fintech SaaS product adds tenant isolation and per-customer configuration to that plan, which matters once you sell to other institutions that each need their own data boundaries.

How much does fintech software development cost?

As a price band, a focused fintech MVP on partner infrastructure commonly costs $80,000-$150,000, a full digital banking or lending platform $250,000-$500,000+, and internal finance automation $50,000-$150,000.

Technology for fintech software

Precision and security guide every technology choice.

Mistakes to avoid in fintech projects

These are expensive to fix after launch.

• Storing balances instead of deriving them from a ledger.
• Choosing a banking partner after designing the product.
• Treating KYC as a form rather than a process.
• Using floating-point numbers for money.
• Skipping idempotency on payment requests.
• Launching without monitoring and a fraud playbook.

Why choose Progression Agency for fintech software?

Financial products need engineering precision and a go-to-market plan. A fintech development company that only ships code leaves the second half to you, so we plan launch, acquisition and partner approvals alongside the build.

• Money-flow and ledger design before screens.
• Partner integration experience across payments and banking-as-a-service.
• Security testing and SOC 2-ready practices.
• Launch marketing for financial brands.
• You own code, data and accounts.
• Headquartered in New York City.

Related services

See custom software development, MVP development and mobile app development.

Frequently asked questions