Open banking development connects financial institutions with approved third-party applications through secure APIs and customer-authorized access to data. Products built on these connections range from account aggregation and financial management tools to payment initiation and lending workflows. Engineering requirements extend beyond the initial API connection: teams must manage consent, authentication, data consistency, uptime, and integration with existing banking systems. The technical approach depends on the product's market, regulatory environment, and banking infrastructure.
1. Itexus
Itexus develops custom fintech and banking software, including digital banking applications, financial data platforms, and integrations with external financial services. Its engineering work spans customer-facing interfaces, backend systems, payment flows, and software that connects financial information across applications. For open banking initiatives, that combination is relevant to account aggregation, consent-driven data access, and payment-enabled customer experiences.
Financial organizations can engage Itexus for new product development or modernization of an existing platform. Its focus on financial software also supports projects that require dependable data handling, regulated workflows, and integration with established banking infrastructure.
Key Facts
- Best for: Custom open banking products and fintech application development
- Core services: Open banking development, banking software, financial API integrations, digital payments, mobile development
- Specialization: Full-cycle fintech product engineering
- Headquarters: Dover, DE, USA
- Founded: 2013
- Team size: 150+ engineers
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: 8, The Green, STE road, Dover, DE 19901, United States
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
2. Software Mind
Software Mind runs a dedicated open banking software development service inside its fintech practice. The team builds API integrations that connect banks with third-party apps, using OAuth 2.0 for authentication and consent flows and writing code that absorbs the differences between individual banks' implementations. It also builds account-to-account payments that skip card networks, with authentication at the bank and payment status tracking.
On the data side, the company offers transaction enrichment that categorizes spending, identifies merchants, detects recurring payments and calculates cash flow, plus instant identity verification from bank account data. Its work is framed around PSD2, GDPR and strong customer authentication, which suits fintechs and banks building regulated account-data or payment products.
Key Facts
- Best for: Fintechs adding bank data and account-to-account payments
- Core services: Bank API integration, direct bank payments, transaction enrichment, identity verification
- Specialization: PSD2-compliant consent flows and transaction categorization
- Headquarters: Kraków, Poland
- Founded: 1999
- Team size: 1,001–5,000 employees
Contact Information
- Website: softwaremind.com
- Address: Al. Jana Pawła II 43B, Podium Park, 31-864 Kraków, Poland
- LinkedIn: pl.linkedin.com/company/software-mind
3. Cleveroad
Cleveroad offers open banking development as part of its fintech practice. The team designs versioned open banking APIs, builds consent lifecycle management with revocable and auditable third-party permissions, and connects open banking components to core banking and identity systems. Its solution types cover account information services, payment initiation, API management platforms, TPP management and data aggregation, with work aligned to PSD2, FDX in the US and CDR in Australia.
As evidence, it publishes an eBanking platform case for a Swiss investment bank, where it replaced an outdated MVP with an API-ready system for B2B and B2C clients, adding KYC onboarding and digital account opening. The company holds ISO 9001 and ISO 27001 and works through staff augmentation, dedicated teams or custom development.
Key Facts
- Best for: Banks building consent-managed open banking APIs
- Core services: Open banking APIs, consent management, AIS, PIS, TPP management
- Specialization: PSD2, FDX and CDR-aligned API and consent platforms
- Founded: 2011
Contact Information
- Website: cleveroad.com
4. Zfort Group
Zfort Group implements open banking integrations as part of its custom software development work. The team builds encrypted API gateways and authentication for bank data exchange, account information services that pull balances, transaction histories and financial profiles in real time, and payment initiation flows wired into existing banking infrastructure. Consent tracking and audit trails are built in to support PSD2 and regional open banking rules.
Beyond the core connectivity, Zfort connects banks with fintech apps, lending systems and payment providers, and adds dashboards that track API performance, usage and compliance status on cloud-native infrastructure. It suits banks and fintechs that want a development team to wire open banking into an existing product rather than buy a ready platform.
Key Facts
- Best for: Adding open banking integrations to existing financial products
- Core services: API gateways, AIS, PIS, consent management, third-party integration
- Specialization: PSD2-aligned bank connectivity with compliance monitoring dashboards
- Headquarters: New York, NY, USA
- Founded: 2000
- Team size: 201–500 employees
Contact Information
- Website: zfort.com
- Email: moc.trofz@tcatnoc
- Address: 600 3rd Avenue, 2nd floor, Manhattan, New York, NY 10016, United States
- LinkedIn: www.linkedin.com/company/zfort-group
5. Andersen
Andersen has a dedicated open banking and API development practice for financial institutions and fintech businesses. Its services cover connections that let third-party applications access banking functions, including account-information and payment-initiation use cases. The company also works on banking platforms, legacy modernization, and compliance-oriented financial integrations.
That scope is useful when an institution needs to expose services through APIs while updating the systems behind them. Andersen combines application development with systems integration, making its work relevant to customer-facing open banking products and the infrastructure that supports them.
Key Facts
- Best for: Banks implementing API-based financial services
- Core services: Open banking API development, banking integration, fintech engineering
- Specialization: Account information, payment initiation, integration architecture
- Headquarters: Warsaw, Poland
- Founded: 2007
- Team size: 1,001–5,000 employees
Contact Information
- Website: andersenlab.com
- Phone: +1 910 916 4176
- Email: moc.balnesredna@tcatnoc
- Address: 7300 State Highway 121, Suite 300, Dallas, Texas, 75070, USA
- LinkedIn: www.linkedin.com/company/andersen-lab
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
- Instagram: www.instagram.com/andersen.global
6. A-listware
A-listware develops custom software and supplies engineering teams for finance-related projects. Its financial technology work includes traditional banking systems, investment platforms, payment-oriented applications, and web and mobile products. The company also supports backend engineering and integrations, which are central to connecting financial applications with bank APIs and other data providers.
Businesses building open banking-enabled products can use these capabilities to develop interfaces, integration layers, and supporting financial software. Its team extension model also gives existing technical departments a way to add developers and testers to banking product work.
Key Facts
- Best for: Engineering teams building API-connected financial applications
- Core services: Custom fintech software, backend development, mobile apps, team extension
- Industries: Banking, investment services, insurance
- Headquarters: London, UK
Contact Information
- Website: a-listware.com
- Phone: +1 (888) 337 93 73
- Email: moc.erawtsil-a@ofni
- Address: North Bergen, NJ 07047, USA
- LinkedIn: www.linkedin.com/company/a-listware
- Facebook: www.facebook.com/alistware
7. Innowise
Innowise has delivered an open banking aggregation platform that connects financial institutions through APIs. The published project included an API gateway, authentication and authorization functions, and infrastructure for accessing banking information through a shared interface. Its engineering teams also work on enterprise software, cloud environments, and system modernization.
This experience is relevant to fintech providers seeking to aggregate financial accounts or establish controlled access to banking data. Innowise can address the integration layer and the surrounding software needed to operate, monitor, and extend a financial platform.
Key Facts
- Best for: API aggregation and connected banking platforms
- Core services: Open banking integration, API gateways, authentication, custom development
- Specialization: Financial data connectivity and platform engineering
- Headquarters: Warsaw, Poland
- Founded: 2007
- Team size: 1,001–5,000 employees
Contact Information
- Website: innowise.com
- Phone: +1 917 267 7727
- Email: moc.esiwonni@tcatnoc
- Address: 50 Franklin St, Office 203, Boston, MA 02110
- LinkedIn: www.linkedin.com/company/innowise-group
- Twitter: x.com/innowisegroup
8. Netguru
Netguru works with banks and fintech businesses on digital product engineering, open finance, and API-connected services. Its financial sector work includes digital banking experiences, payments, and platform development, with attention to how customers interact with information drawn from multiple financial sources.
The company suits programs where open banking is part of a wider customer experience, such as a mobile banking journey or a service built around financial data. Product design, application development, and backend integration can form one engagement, helping teams connect technical services to an accessible interface.
Key Facts
- Best for: Customer-facing open finance and digital banking products
- Core services: Fintech engineering, financial API integrations, digital product design
- Specialization: Product development combining user experience and backend systems
- Headquarters: Poznań, Poland
- Founded: 2008
- Team size: 501–1,000 employees
Contact Information
- Website: www.netguru.com
- Email: moc.urugten@olleh
- Address: Nowe Garbary Office Center, ul. Małe Garbary 9, 61-756 Poznań, Poland
- LinkedIn: www.linkedin.com/company/netguru
9. DashDevs
DashDevs offers dedicated open banking integration and development services. Its teams have worked with APIs from Plaid, TrueLayer, and Salt Edge for account aggregation, financial data access, and payment initiation. The company also has experience with Tarabut, a regulated open banking platform serving the Middle East.
This portfolio connects practical integration work with the regulatory and product requirements of fintech businesses. DashDevs covers provider selection, implementation, testing, and ongoing maintenance, making it relevant to firms adding account connectivity or pay-by-bank functions to an existing product.
Key Facts
- Best for: Open banking API implementation and fintech integrations
- Core services: Account aggregation, payment initiation, API integration, fintech engineering
- Specialization: Banking connectivity and regulated fintech products
- Headquarters: Wilmington, DE, USA
- Founded: 2011
- Team size: 51–200 employees
Contact Information
- Website: dashdevs.com
- Email: moc.svedhsad@ofni
- Address: 1007 North Orange Street, 4th Floor, Wilmington, DE 19801
- LinkedIn: www.linkedin.com/company/dashdevs
- Facebook: www.facebook.com/dashdevs
- Twitter: x.com/dashdevs
10. Relevant Software
Relevant Software develops digital banking platforms and financial applications, including services that depend on open banking APIs. Its work covers account and payment functions, integrations with third-party financial providers, and software built around financial operations. The company also provides product development and modernization services for established technology systems.
Fintech teams can use Relevant Software when banking connectivity needs to be combined with an end-user application or wider service platform. Its financial product experience supports integration architecture and the software layers that use incoming financial data.
Key Facts
- Best for: Custom banking platforms and API-connected applications
- Core services: Digital banking, open banking integrations, payment software, product engineering
- Specialization: Financial software development and system integration
- Headquarters: Lviv, Ukraine
- Founded: 2013
- Team size: 51–200 employees
Contact Information
- Website: relevant.software
- Phone: +19293228942
- Email: erawtfos.tnaveler@emoclew
- Address: Jana Dantyszka 18, Warsaw, 02-054
- LinkedIn: www.linkedin.com/company/relevant-software
- Facebook: www.facebook.com/relevant.software
- Twitter: x.com/RelevantSoft
- Instagram: www.instagram.com/relevant.software
11. Vention
Vention has a dedicated practice for open banking development and API integrations. Its services include technical consulting, custom open banking applications, banking data connections, and integration with payment and account information services. It also works with fintech firms on mobile products and financial system modernization.
The company addresses use cases ranging from personal financial management to payment initiation and lending experiences that require bank data. Vention can support an open banking integration alongside the wider application, either through a complete project or an expanded engineering team.
Key Facts
- Best for: Open banking apps and API integration projects
- Core services: Banking API connectivity, fintech software, mobile apps, technical consulting
- Specialization: Open banking integrations across financial use cases
- Headquarters: New York, NY, USA
- Founded: 2002
- Team size: 1,001–5,000 employees
Contact Information
- Website: ventionteams.com
- Phone: +1 (718) 374-5043
- Email: moc.smaetnoitnev@olleh
- Address: 575 Lexington Avenue, 14th Floor, New York, NY 10022
- LinkedIn: www.linkedin.com/company/ventionteams
- Twitter: x.com/ventionteams
- Instagram: www.instagram.com/ventionteams
12. OSKI Solutions
OSKI Solutions develops custom software for financial services and other sectors, with a fintech practice covering payment-related systems and business process applications. Its engineering includes web development, cloud technologies, integrations, and ongoing product support. These capabilities support services that connect financial data with internal workflows or payment infrastructure.
The company can undertake application development around an open banking implementation, including API-connected backend features, user interfaces, and maintenance. Its combination of financial industry work and software engineering is relevant to organizations building connected financial tools tailored to their operational needs.
Key Facts
- Best for: Custom fintech applications and connected business systems
- Core services: Financial software development, payments integration, cloud engineering
- Specialization: Business-focused software and long-term technical support
- Headquarters: Tallinn, Estonia
- Team size: 51–200 employees
Contact Information
- Website: oski.site
- Email: etis.ikso@tcatnoc
- Address: Kaupmehe tn 7-120, Tallinn, 10114, Estonia
- LinkedIn: www.linkedin.com/company/oski-solutions
13. ScienceSoft
ScienceSoft builds financial software and integrates banking connectivity into lending, payment, and accounting systems. Its services include integrations with Plaid, Yodlee, MX, and Mastercard Open Banking for account verification, transaction insights, and bank-based payment functions. A published accounting software project also involved bank communication through open banking APIs.
That experience is relevant where bank data supports a wider business workflow. ScienceSoft connects open banking integration to borrower verification, financial reconciliation, and payment processing rather than treating account connectivity as a standalone feature.
Key Facts
- Best for: Banking data integration within payment, lending, and accounting software
- Core services: Open banking provider integration, financial software, payment systems
- Specialization: Business workflow automation and financial API connectivity
- Headquarters: McKinney, TX, USA
- Founded: 1989
- Team size: 501–1,000 employees
Contact Information
- Website: www.scnsoft.com
- Phone: +1 214 306 68 37
- Email: moc.tfosncs@tcatnoc
- Address: 5900 S. Lake Forest Drive, Suite 300, McKinney, Dallas area, TX-75070
- LinkedIn: www.linkedin.com/company/sciencesoft
- Facebook: www.facebook.com/sciencesoft.solutions
- Twitter: x.com/ScienceSoft
14. N-iX
N-iX has implemented open banking for a UK financial institution as part of a neobank transformation. Its team developed an API for third-party providers, integrated open banking components into existing architecture, and introduced strong customer authentication. The project also included regulatory reporting and mobile banking development.
This is particularly relevant to banks whose open banking responsibilities sit alongside changes to established systems. N-iX combines API connectivity with banking modernization, security, and product engineering, supporting institutions that need the regulatory interface and the surrounding technology changes.
Key Facts
- Best for: Bank-led open banking implementation and modernization
- Core services: Open banking APIs, mobile banking, cybersecurity, core banking integration
- Specialization: Banking platform transformation and third-party connectivity
- Headquarters: Valletta, Malta
- Founded: 2002
- Team size: 1,001–5,000 employees
Contact Information
- Website: www.n-ix.com
- Phone: +17273415669
- Email: moc.xi-n@tcatnoc
- Address: 4330 W Broward Boulevard – Space P/Q, Plantation, FL 33317
- LinkedIn: www.linkedin.com/company/n-ix
- Facebook: www.facebook.com/N.iX.Company
- Twitter: x.com/N_iX_Global
Comparison Table
| Company | Best for | Headquarters | Founded | Team size |
| Itexus | Custom open banking products and fintech application development | Dover, DE, USA | 2013 | 150+ engineers |
| Software Mind | Fintechs adding bank data and account-to-account payments | Kraków, Poland | 1999 | 1,001–5,000 employees |
| Cleveroad | Banks building consent-managed open banking APIs | — | 2011 | — |
| Zfort Group | Adding open banking integrations to existing financial products | New York, NY, USA | 2000 | 201–500 employees |
| Andersen | Banks implementing API-based financial services | Warsaw, Poland | 2007 | 1,001–5,000 employees |
| A-listware | Engineering teams building API-connected financial applications | London, UK | — | — |
| Innowise | API aggregation and connected banking platforms | Warsaw, Poland | 2007 | 1,001–5,000 employees |
| Netguru | Customer-facing open finance and digital banking products | Poznań, Poland | 2008 | 501–1,000 employees |
| DashDevs | Open banking API implementation and fintech integrations | Wilmington, DE, USA | 2011 | 51–200 employees |
| Relevant Software | Custom banking platforms and API-connected applications | Lviv, Ukraine | 2013 | 51–200 employees |
| Vention | Open banking apps and API integration projects | New York, NY, USA | 2002 | 1,001–5,000 employees |
| OSKI Solutions | Custom fintech applications and connected business systems | Tallinn, Estonia | — | 51–200 employees |
| ScienceSoft | Banking data integration within payment, lending, and accounting software | McKinney, TX, USA | 1989 | 501–1,000 employees |
| N-iX | Bank-led open banking implementation and modernization | Valletta, Malta | 2002 | 1,001–5,000 employees |
How to Choose an Open Banking Development Company
Open banking projects succeed or fail on consent handling, API reliability, and regulatory fit, not on the first successful API call. Whether you are a bank exposing APIs or a fintech consuming them, look for a partner who has run open banking connections in production and knows the rules of your target markets.
Standards and market experience. Open banking rules differ by market: PSD2 and the Berlin Group in the EU, the UK Open Banking Standard, FDX and the CFPB 1033 rule in the US, and the Consumer Data Right in Australia. Ask which standards the team has implemented in production and what certification or conformance testing they passed. Experience in one market does not automatically transfer to another.
Consent and authentication flows. Ask to see consent journeys they have built, including redirect and decoupled authentication, consent renewal, revocation, and dashboards where customers manage access. Poor consent flows cause high drop-off and complaints. Check how they handle strong customer authentication, token storage, and expired consents without breaking downstream features like recurring payments or account refreshes.
Aggregator versus direct connections. Many products use an aggregator such as a third-party data platform, while others connect to bank APIs directly or need a licence of their own. A good partner explains the trade-offs in cost, coverage, data quality, and regulatory responsibility for your case. Be wary of a vendor who recommends only the approach they happen to resell.
Data quality and normalization. Bank APIs return inconsistent formats, missing fields, and uneven transaction descriptions. Ask how they normalize account and transaction data, categorize transactions, and handle duplicates or pending items. For lending or personal finance products, data quality drives decision accuracy, so request examples of the data models and enrichment logic they have built before.
Reliability and monitoring. Bank APIs go down, rate-limit, and change without much notice. Ask how the team monitors connection health per bank, retries failed calls, and alerts on error spikes. Check whether they build fallbacks and clear user messaging for outages. Production monitoring dashboards from past projects are strong evidence of real operating experience.
Security and regulatory support. Open banking involves eIDAS or similar certificates, mutual TLS, FAPI security profiles, and strict data protection. Ask how they manage certificates and keys, and whether they have supported clients through licensing as an AISP or PISP or through bank security reviews. Confirm they can produce documentation your compliance and risk teams will request.
Conclusion
Open banking projects become more demanding as financial products rely on data and payment connections across several institutions. A successful implementation needs more than a functioning endpoint: consent journeys, strong authentication, monitoring, error handling, and clear operational ownership all affect the customer experience. Integration designs must account for differences between markets and the changing behavior of external API providers. For banks, legacy architecture and internal governance can determine how quickly a new service reaches production. For fintech businesses, dependable data access and a useful customer experience are as important as feature breadth. Long-term maintainability is therefore an essential part of open banking development.
Frequently Asked Questions
How much does open banking development cost?
Costs range widely, from tens of thousands of dollars for an integration through an aggregator to several hundred thousand or more for a bank building a compliant API platform or a fintech building direct connections. Main cost drivers are the number of banks and markets, direct versus aggregator connectivity, consent and security requirements, certification, and ongoing monitoring and maintenance.
How long does an open banking project take?
An integration using an existing aggregator can often go live in one to three months. Building direct bank connections or a bank-side API platform usually takes six months or more, because of certification, security reviews, and testing with each bank. Regulatory licensing, if you need it, runs in parallel and can take longer than development.
Do we need a licence to use open banking APIs?
It depends on your market and model. In the EU and UK, accessing account data or initiating payments directly requires authorization as an AISP or PISP, or working under a licensed provider as an agent. Many companies start by using a licensed aggregator to avoid holding a licence themselves. In the US, rules are developing under the CFPB 1033 framework, so get legal advice early.
What is the difference between open banking and open finance?
Open banking covers access to payment accounts, such as balances, transactions, and payment initiation. Open finance extends the same principle to other financial products, including savings, investments, pensions, insurance, and loans. Several markets are moving toward open finance frameworks, so it makes sense to design data models and consent systems that can expand beyond current accounts.
What should we prepare before hiring an open banking developer?
Define the use case, such as account aggregation, payments, or credit decisions, and list the target markets and banks. Clarify your regulatory position: whether you hold a licence, plan to obtain one, or will use an aggregator. Gather your security requirements, expected user volumes, and the systems the data must feed. This lets vendors scope accurately and flag risks early.