Fintech Software Development
Financial Software Has to Work When Money Is Moving
G-2 provides fintech software development for banks, payment providers, and fintech companies. We build financial platforms, payment integrations, Open Banking APIs, and transaction-focused systems where security, reliability, and regulatory scope matter.
A failed transaction is a business problem. Financial systems connect payments, data, third-party providers, security controls, and business rules — and those parts have to work together as volume grows.
Who This Is For
Building a financial product
payment platform, financial SaaS, or digital banking product.
Modernising financial software
replace legacy components, connect existing systems, or add new functionality without a full rebuild.
Integrating payments and financial services
payment gateways, PSPs, SEPA, PSD2, Open Banking, and other providers.
Scaling transaction volume
architecture needs to support more transactions, users, and workloads.
Meeting compliance requirements
technical requirements around PCI DSS, PSD2, SEPA, GDPR, or applicable financial rules need to be considered in the build.
Fintech Development Services
Custom Financial Software Development
Software designed around your business model, workflows, users, and compliance scope.
Payment Software Development & Integrations
Payment flows and integrations with gateways, PSPs, banks, and payment infrastructure.
Financial API Development
APIs and Open Banking integrations connecting platforms with banks, payment providers, and internal systems.
High-Load Financial Systems
Systems designed around transaction volume, concurrency, performance, and reliability requirements.
Banking Software Development
Development and modernization of digital banking and financial platforms.
Fintech SaaS Development
Multi-tenant fintech software serving multiple customers or organisations from one platform.
Transaction Processing Software
Systems where consistency, reconciliation, performance, and data integrity are critical.
Risk & Compliance Software
KYC/AML monitoring, screening, fraud-prevention, and compliance workflows.
Legacy Financial System Modernisation
Integration, component replacement, refactoring, or phased modernization of existing financial software.
Not sure which of these your product needs?
Get scope & QuoteWhy Fintech Development Is Different
Fintech platforms sit where money, data, security, integrations, and regulation meet.
The difficult part is not a single feature; it is making transactions, payment flows, business rules, and external services work reliably together.
Fintech Development Process
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1 — Discover
business model, financial workflows, users, integrations, compliance scope.
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2 — Architect
architecture, APIs, data flows, integrations, security requirements.
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3 — Build & Integrate
platform development and connection to financial services.
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4 — Test & Scale
functionality, integrations, security, performance, and production readiness.
What You Get
Custom fintech software
Payment integrations
Scalable architecture
Financial APIs
Backend and database engineering
Continued engineering support as requirements change
Build. Integrate. Scale.
Get a scope & QuoteWhy G-2?
G-2 has software-engineering experience in fintech and compliance products. One example is Finchecker, a fintech compliance platform built by G-2. A fuller public case study and supporting production metrics can be added once the relevant evidence is approved for publication.
Cost
Cost depends on product scope, integrations, security requirements, PCI DSS scope, complexity, and the development model. A payment integration and a transaction-processing platform are very different projects.
FAQ
What is fintech software development?
Software development for payments, banking, financial services, and financial operations, including platforms, APIs, integrations, and transaction systems.
What systems can G-2 build?
Payment platforms, financial management systems, banking software, fintech SaaS, transaction processing, risk and compliance systems, and modernised financial software.
Can you develop a fintech product from scratch?
Yes. G-2 can take a product from discovery and architecture through development, integrations, testing, and further evolution.
Can G-2 integrate payment gateways and PSPs?
Yes. Payment and provider integrations can be built into the platform architecture.
Do you support PSD2, SEPA, and Open Banking integrations?
They can be included in scope depending on your providers, licensing, target markets, and technical requirements.
Does G-2 develop software with PCI DSS requirements in scope?
Yes. PCI DSS requirements can be considered in the technical and security scope. Full compliance depends on the wider environment, infrastructure, processes, and controls.
Can you modernise legacy financial software?
Yes. We can modernise, integrate, replace components, or rebuild in phases.
Discuss Your Fintech Project
Tell us what you are building, which providers or systems need to connect, and what stage the project is at.