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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.

On this page · 12 sections
  1. What is fintech software development?
  2. Financial software we develop
  3. What features does fintech software need?
  4. Which financial systems do we integrate?
  5. Security and compliance for financial software
  6. Our fintech development process
  7. How much does fintech software development cost?
  8. Technology for fintech software
  9. Mistakes to avoid in fintech projects
  10. Why choose Progression Agency for fintech software?
  11. Related services
  12. Video: building software products

The short answerFintech software development is building software that moves, lends, stores, analyzes or reports money — digital banking and wallet apps, payment platforms, lending systems, investment tools and back-office finance software. What distinguishes it is identity verification (KYC), fraud controls, strong authentication, precise ledgers, audit trails and compliance with rules such as PCI DSS and federal consumer-finance law. Custom fintech software commonly costs $100,000-$500,000+ and takes 5-12 months.

Regulatory descriptions are summaries, not legal advice; confirm obligations with counsel. Cost ranges are planning figures.

Fintech and banking software searches
Financial companies search for developers who understand compliance and security, not only code.

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.

Onboard — Onboarding and KYC. Verify customers smoothly..
Pay — Payments. Cards, ACH, wallets..
Lend — Lending. Applications to servicing..
Bank — Digital banking. Accounts and transactions..
Invest — Investing and wealth. Portfolios and reporting..
Ops — Finance back office. Reconciliation and reporting..

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.

Payment platforms and integrations

Card, ACH and real-time payments, payouts, subscriptions and marketplace money flows.

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.

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.

What features does fintech software need?

Trust features matter as much as the product feature itself.

Core features of fintech software
FeatureWhy it matters
Identity verification (KYC)Required onboarding and fraud prevention
Strong authenticationMFA, biometrics, device binding
Double-entry ledgerBalances that always reconcile
Transaction monitoringFlags suspicious activity
Audit trailsEvery change attributable
Statements and notificationsClear, timely customer communication
Dispute and support toolsResolve issues quickly
ReportingRegulatory and management reporting

Which financial systems do we integrate?

Fintech products are integration-heavy by design.

Common integrations
SystemWhat we connect
Payment processorsCard, ACH and payouts
Banking-as-a-serviceAccounts, cards, money movement
Account aggregationLinking external accounts
KYC / identity providersIdentity and document verification
Core bankingCredit union and bank cores via APIs
AccountingGeneral ledger and reconciliation

Security and compliance for financial software

Which rules apply depends on the product and your partners. We map them before design.

  • PCI DSS when card data is stored, processed or transmitted (PCI SSC).
  • KYC and anti-money-laundering programs, typically operated with your bank partner.
  • Federal consumer-finance rules overseen by the CFPB (CFPB).
  • Gramm-Leach-Bliley Act privacy and safeguards requirements (FTC).
  • SOC 2 evidence for enterprise and partner due diligence.
  • State licensing requirements for money transmission and lending, confirmed with counsel.
How a fintech software project runs
Mapping every money flow before building is what keeps ledgers correct and audits painless.

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.

How much does fintech software development cost?

As a planning range, a focused fintech MVP on partner infrastructure commonly costs $100,000-$200,000, a full digital banking or lending platform $250,000-$500,000+, and internal finance automation $50,000-$150,000.

Fintech software cost ranges (planning figures)
ScopeTypical rangeTimeline
Finance operations automation$50,000-$150,0002-5 months
Fintech MVP on partner infrastructure$100,000-$200,0004-6 months
Lending platform$200,000-$400,0006-10 months
Digital banking or payments platform$250,000-$500,000+8-12+ months

Technology for fintech software

Precision and security guide every technology choice.

Technology we typically use
LayerChoice
Front endTypeScript, React, Next.js
MobileSwift, Kotlin, React Native
BackendNode.js, Python, strongly typed services
DataPostgreSQL with double-entry ledger design
SecuritySecrets management, encryption, WAF
HostingAWS, Azure or Google Cloud with infrastructure as code

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.
Ledger integrity — Trust. Always reconciles..
Idempotent payments — Trust. No double charges..
MFA and biometrics — Trust. Protect accounts..
Audit trails — Trust. Every action logged..
Threat modeling — Trust. Before build..
Pen testing — Trust. Before launch..

Why choose Progression Agency for fintech software?

Financial products need engineering precision and a go-to-market plan.

  • 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.

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

Building a fintech product?

Describe the money flows and partners involved. We will propose an architecture and phased plan.

Get a fintech proposal

Video: building software products

Explainers on SaaS, MVPs and the frameworks we use.

Getting found in search

AI, AEO and what is changing

Paid media and lead generation

Websites and design

Choosing and working with an agency

Software and app development

Social, content and brand

By industry and by situation

Frequently asked questions

What is fintech software development?
Building custom software for financial services such as payments, banking, lending, investing and finance operations.
How much does fintech software development cost?
As a planning range, $100,000-$200,000 for an MVP on partner infrastructure and $250,000-$500,000+ for full platforms.
How long does it take to build a fintech app?
Commonly 4-6 months for an MVP and 8-12+ months for a full platform.
Do I need a bank to launch a fintech product?
Most US fintechs partner with a bank or banking-as-a-service provider for accounts and money movement.
What is KYC?
Know Your Customer: verifying customer identity to prevent fraud and meet anti-money-laundering obligations.
What is PCI DSS?
The Payment Card Industry Data Security Standard for protecting card data.
Do you build banking software for credit unions?
Yes: member onboarding, loan applications and tools integrated with core systems.
Can you integrate payments into our app?
Yes: card, ACH, subscriptions, payouts and marketplace payments.
How do you keep financial data secure?
Encryption, strong authentication, least-privilege access, audit logs, threat modeling and penetration testing.
Do you build lending software?
Yes: applications, document collection, decisioning integrations and servicing portals.
What is a double-entry ledger?
An accounting model where every transaction records equal debits and credits, keeping balances accurate.
Who owns the fintech software?
You do.
Where is Progression Agency located?
New York City, working with financial companies nationwide.
What should I look for in a fintech software development company?
Experience with ledgers, payments and KYC partners, security practices, test coverage and a clear compliance process.
What tech stack is best for fintech?
Strongly typed backends, relational databases with ledger design, mature payment SDKs and infrastructure as code on a major cloud.
Can you build a digital wallet app?
Yes, typically on a banking-as-a-service or payments partner that holds funds.
How do you prevent fraud in fintech apps?
Identity verification, device signals, velocity limits, transaction monitoring and manual review queues.
Do fintech apps need SOC 2?
Not by law, but partners and enterprise customers commonly ask for it.
Can you build software for insurance companies?
Yes; see our insurance software development page.
How much maintenance does fintech software need?
Continuous security updates, partner API changes, monitoring and compliance changes; plan a monthly support budget.

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