This list covers development companies that integrate aggregation APIs such as Plaid, MX or Tink into banking, lending and wealth products. Account aggregation services connect accounts held at different financial institutions and make authorized data available in a single application. Banks, lenders, wealth platforms, and fintech developers use this information for personal financial management, verification, cash-flow analysis, and digital onboarding. Open banking APIs have expanded the ways customers can grant access, while consent management, institution coverage, refresh reliability, and data quality remain essential implementation questions.
1. Itexus
Itexus integrates account aggregation providers into banking, lending and personal finance apps. Itexus develops financial software for banks, fintech companies, lenders, and wealth-management businesses. Its API integration work includes open banking connections with providers such as Plaid, Yodlee, and MX, along with account-linking workflows, transaction synchronization, and financial data processing. Teams can use that experience to connect existing financial products to account aggregation infrastructure without rebuilding every banking connection.
The company also handles custom banking applications, cloud backends, and fintech modernization. That combination is relevant when aggregated data must feed dashboards, lending decisions, personal finance features, or internal banking systems. For businesses seeking a tailored product rather than a standalone aggregation API, Itexus brings both application engineering and provider-integration work into one delivery process.
Key Facts
- Best for: Custom fintech products using external account aggregation APIs
- Core services: Account aggregation and open banking integration, fintech software development
- Specialization: Banking applications, financial data integrations, transaction synchronization
- 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. FintegrationFS
FintegrationFS is a fintech engineering firm that works on bank-data integrations for US fintech products. Its Plaid practice covers Auth, Transactions, Identity, Assets and Income, Investments, Liabilities and Transfer, and the team also works with MX, Finicity, Yodlee, Akoya and Stripe Financial Connections. It offers fixed-scope audits of existing Plaid implementations, fixes and optimization work, and ongoing support plans.
Published case studies include a bank data sync tool for a US payment platform built on Plaid, MX and Meld, the Frank Spend personal finance layer, the Solstice Money app and a personal wealth management app in Singapore. It suits teams that need a new aggregation integration or a repair of an existing one.
Key Facts
- Best for: Plaid, MX and Yodlee integration builds and audits
- Core services: Aggregator API integration, implementation audits, optimization, support
- Specialization: Multi-aggregator bank data connectivity for US fintechs
- Founded: 2014
- Team size: 51–200 employees
Contact Information
- Website: fintegrationfs.com
- Email: moc.sfnoitargetnif@napra
- Phone: +1 (408) 418-2891
- Address: 3952 Sapphire Loop, Round Rock, TX 78681
- LinkedIn: www.linkedin.com/company/mobilefirst-applications
3. Django Stars
Django Stars builds custom fintech software, including web and mobile apps, integrations with banking APIs and modernization of existing systems. Its personal finance management offering lists bank account aggregation as a feature, alongside work in digital banking, lending, mortgages, wealth management, accounting and financial analytics.
Published fintech projects include MoneyPark, a Swiss online mortgage broker, Molo Finance, a UK mortgage lender, the Saudi bank SAIB and Repositax, a US tax and compliance platform. The company suits fintechs that need a full product team to design and build the application around an aggregation provider, from consent screens to analytics.
Key Facts
- Best for: Full-cycle fintech products with banking API integrations
- Core services: Fintech app development, software integration, UI/UX, modernization
- Specialization: Personal finance, lending, mortgage and banking software
- Headquarters: Kyiv, Ukraine
- Founded: 2008
- Team size: 51–200 employees
Contact Information
- Website: djangostars.com
- Email: moc.sratsognajd@ofni
- Address: 2810 N Church St, Ste 27948, Wilmington, DE 19802, USA
- LinkedIn: www.linkedin.com/company/django-stars
4. Velmie
Velmie provides a digital banking platform, a white-label application and API middleware for financial companies, together with system integration services. Its work covers bank connectivity and partner bank connections, payment rails, card issuing, KYC and AML screening integrations, customer onboarding and back-office tooling.
That middleware and integration layer is what an aggregation project needs between a data provider and the customer-facing product: connections to banks and third-party services, onboarding journeys and the web and mobile channels that present the data. Velmie has offices in New York, London, Dubai, Vilnius and Warsaw, and suits banks and fintechs that want a ready platform base rather than a build from scratch.
Key Facts
- Best for: Fintechs wanting a white-label platform with bank connectivity
- Core services: Digital banking platform, API middleware, system integration, onboarding
- Specialization: Bank connectivity and integration middleware for financial products
Contact Information
- Website: velmie.com
- LinkedIn: www.linkedin.com/company/velmie
5. OSKI Solutions
OSKI Solutions develops software for financial technology businesses, including banking, lending, and other data-intensive applications. Its API development services cover the integration layer needed to connect multiple systems, authenticate users, and move information between a customer-facing product and external providers. The team works with REST and GraphQL interfaces, cloud platforms, and secure access patterns.
For an account aggregation initiative, those capabilities are useful in building the application surrounding a licensed banking-data provider: consent flows, backend orchestration, normalized account records, and reporting interfaces. OSKI also works on custom product development, so the integration can be designed around a fintech's actual business workflow rather than treated as an isolated API connection.
Key Facts
- Best for: Custom financial applications with multi-system integrations
- Core services: Fintech software development, API development, cloud engineering
- Specialization: Backend integrations and financial application delivery
- Headquarters: Tallinn, Estonia
- Team size: 51–200 employees
Contact Information
- Website: oski.site
- Email: etis.ikso@tcatnoc
- LinkedIn: www.linkedin.com/company/oski-solutions
6. A-listware
A-listware supplies software engineers and development teams for companies building or extending technology products. Its financial services work includes application development and IT infrastructure support, with teams available for backend systems, integrations, and cloud-based delivery. This makes the firm relevant when a business needs engineering resources to implement an external account aggregation service inside an existing application.
Account data projects require more than a successful connection to a bank. Product teams also need reliable data storage, authorization, user interfaces, and handling of exceptions when connections change. A-listware's staffing and engineering model gives organizations a way to increase technical capacity for that work while retaining control of the underlying product and provider choices.
Key Facts
- Best for: Financial technology teams adding development capacity
- Core services: Software engineering teams, financial software, IT infrastructure
- Specialization: Dedicated engineering support and system integration
- 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. DashDevs
DashDevs engineers banking and fintech products with open banking connectivity at their core. Its financial data aggregation work includes integrations with Plaid, TrueLayer, and Salt Edge, as well as custom API layers that connect customer accounts to lending, payment, and financial management products. The firm also develops the related consent, security, and transaction workflows required to use external account data.
One notable project involved building an open banking platform for Tarabut, including integrations across banks in Bahrain. DashDevs is relevant to organizations that need both a working aggregation interface and the surrounding financial application, rather than a standalone feed of normalized data.
Key Facts
- Best for: Custom open banking and embedded finance platforms
- Core services: API integration, fintech development, digital banking
- Aggregation capabilities: Multi-bank connectivity and account information access
- Notable projects: Tarabut open banking platform
- 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
8. Intellias
Intellias develops digital banking platforms, financial APIs, and data integration systems. Its banking work includes creating an API layer for third-party connections and building data infrastructure that brings information from multiple sources into a common environment. The company also works with financial institutions on service modernization and analytics-driven banking products.
An Intellias case study involving a German digital banking platform describes a data system designed to aggregate, store, and process information from several sources. Its experience with connected banking products is relevant to organizations building unified financial views alongside broader digital banking functionality.
Key Facts
- Best for: Digital banking modernization and integrated financial platforms
- Core services: Banking software, API development, data platform engineering
- Aggregation capabilities: Multi-source data integration and processing
- Industries: Banking, fintech, financial services
- Founded: 2002
- Team size: 1,001–5,000 employees
Contact Information
- Website: intellias.com
- Email: moc.sailletni@ofni
- Phone: +1 857 444 0442
- Address: 500 West Madison Street, Suite 1000, Chicago, IL 60661
- LinkedIn: www.linkedin.com/company/intellias
- Instagram: www.instagram.com/intellias_global
- Facebook: www.facebook.com/Intellias.GlobalPage
9. Andersen
Andersen develops open banking software, account information services, and APIs for financial institutions. Its offering includes personalized account management platforms, secure financial data exchange, and integration of internal banking systems with outside services. It also develops payment initiation and banking-as-a-service solutions for organizations extending digital banking capabilities.
The firm's banking integration practice covers account information service development and custom middleware. Andersen suits projects in which account aggregation must work within a wider banking architecture, including customer authentication, security controls, account interfaces, and connections to existing systems.
Key Facts
- Best for: Custom account information and open banking software
- Core services: Open API development, banking integrations, custom middleware
- Specialization: Account information services and financial data security
- Industries: Banking and fintech
- Headquarters: Warsaw, Poland
- Founded: 2007
- Team size: 1,001–5,000 employees
Contact Information
- Website: andersenlab.com
- Email: moc.balnesredna@tcatnoc
- Phone: +48 22 390 64 08
- Address: 1 Rondo Daszyńskiego, 23rd floor, Warsaw, 00-843, Poland
- LinkedIn: www.linkedin.com/company/andersen-lab
- Instagram: www.instagram.com/andersen.global
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
10. Innowise
Innowise builds custom financial technology systems, including open banking platforms and API aggregation solutions. A published banking project covers the development of an open banking platform with PSD2-related functionality, API authentication, and integration into an existing technical environment. That work relates directly to the access controls and infrastructure required for account aggregation.
Businesses using Innowise can connect data-sharing requirements to broader software development and modernization work. The company supports custom implementations for financial institutions that need an API architecture adapted to their internal systems, security requirements, and product workflows.
Key Facts
- Best for: Custom open banking platform engineering
- Core services: Software development, banking integration, API aggregation
- Notable projects: Open banking and PSD2-related integration
- Industries: Banking and fintech
- Headquarters: Warsaw, Poland
- Founded: 2007
- Team size: 1,001–5,000 employees
Contact Information
- Website: innowise.com
- Email: moc.esiwonni@tcatnoc
- Phone: +48 (787) 027 706
- Address: Rondo Daszyńskiego 2B, The Warsaw HUB B
- LinkedIn: www.linkedin.com/company/innowise-group
- Twitter: x.com/innowisegroup
11. ScienceSoft
ScienceSoft develops banking and financial applications that combine account management, reporting, data analytics, and integrations with other systems. Its banking solutions cover customer-facing account functions and modernization projects, while its data engineering capabilities support financial information processing and reporting.
For account aggregation initiatives, ScienceSoft is relevant as a software engineering partner that can build the application and integration layers around third-party financial data sources. Its work in banking, investment software, and analytics supports projects where aggregated financial information feeds dashboards, internal decisions, and customer services.
Key Facts
- Best for: Enterprise financial software and analytics
- Core services: Banking software, API development, data integration
- Specialization: Custom financial systems and reporting
- Industries: Banking, investment, financial services
- Headquarters: McKinney, TX, USA
- Founded: 1989
- Team size: 501–1,000 employees
Contact Information
- Website: www.scnsoft.com
- Email: moc.tfosncs@ue
- Phone: +371 66 011 905
- Address: Terbatas iela 14-3 Riga, LV-1011
- LinkedIn: www.linkedin.com/company/sciencesoft
- Facebook: www.facebook.com/sciencesoft.solutions
- Twitter: x.com/ScienceSoft
12. Itransition
Itransition designs and develops custom financial software for banking, fintech, and investment organizations. Its services include modernizing banking applications, developing mobile banking products, and building financial analytics systems. These capabilities are relevant to projects that must bring data from multiple providers into a secure user experience.
For account aggregation, the company fits organizations commissioning a tailored financial portal or application rather than purchasing a proprietary aggregation API. Its engineering services can support integration, data processing, reporting, and digital experiences built around connected financial information.
Key Facts
- Best for: Custom financial portals and banking applications
- Core services: Fintech development, banking software, financial analytics
- Specialization: Enterprise financial software engineering
- Industries: Banking, lending, investment
- Founded: 1998
- Team size: 1,001–5,000 employees
Contact Information
- Website: www.itransition.com
- Email: moc.noitisnarti@ofni
- Phone: +1 720 207 2820
- Address: 160 Clairemont Ave, Suite 200, Decatur, GA 30030
- LinkedIn: www.linkedin.com/company/itransition
- Facebook: www.facebook.com/Itransition
- Twitter: x.com/itransition
13. Softjourn
Softjourn develops fintech integrations that connect applications to financial data aggregators and open banking providers. Its integration services include Plaid, TrueLayer, and Salt Edge, enabling access to account and transaction data. The company also works with digital banking, investment, and expense management products that require accurate data from external financial systems.
A Softjourn case study describes integration work involving Finicity, including the architectural changes and security considerations required when adding a financial data provider to an existing platform. That experience makes Softjourn relevant for teams modernizing established applications as well as those launching new connected financial products.
Key Facts
- Best for: Financial data provider integrations and fintech modernization
- Core services: Open banking APIs, financial integrations, software engineering
- Integrations: Plaid, TrueLayer, Salt Edge, Finicity
- Industries: Fintech, banking, expense management
- Headquarters: Fremont, CA, USA
- Founded: 2001
- Team size: 201–500 employees
Contact Information
- Website: softjourn.com
- Phone: +1.510.744.1528
- Address: 39270 Paseo Padre Pkwy, Suite 251, Fremont, CA 94538
- LinkedIn: www.linkedin.com/company/softjourn-inc
- Instagram: www.instagram.com/softjourn
- Facebook: www.facebook.com/Softjourn
- Twitter: x.com/Softjourn
14. N-iX
N-iX provides software development and technology consulting for financial institutions, including digital banking, lending, capital markets, and data-led financial products. Its published banking work includes open banking implementation, customer authentication, and modernization of mobile channels for a specialist bank.
For an account aggregation initiative, N-iX offers engineering expertise around the financial application and the bank-facing integration layer. The company is relevant when external account connectivity must be incorporated into a larger modernization effort involving digital channels, security, and financial data platforms.
Key Facts
- Best for: Bank modernization and integrated financial platforms
- Core services: Fintech software development, open banking, digital banking
- Notable projects: Open banking implementation for a specialist bank
- Industries: Financial services and banking
- Headquarters: Valletta, Malta
- Founded: 2002
- Team size: 1,001–5,000 employees
Contact Information
- Website: www.n-ix.com
- Email: moc.xi-n@tcatnoc
- Phone: +442037407669
- Address: London EC3A 7BA, 6 Bevis Marks
- 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 fintech products using external account aggregation APIs | Dover, DE, USA | 2013 | 150+ engineers |
| FintegrationFS | Plaid, MX and Yodlee integration builds and audits | — | 2014 | 51–200 employees |
| Django Stars | Full-cycle fintech products with banking API integrations | Kyiv, Ukraine | 2008 | 51–200 employees |
| Velmie | Fintechs wanting a white-label platform with bank connectivity | — | — | — |
| OSKI Solutions | Custom financial applications with multi-system integrations | Tallinn, Estonia | — | 51–200 employees |
| A-listware | Financial technology teams adding development capacity | London, UK | — | — |
| DashDevs | Custom open banking and embedded finance platforms | Wilmington, DE, USA | 2011 | 51–200 employees |
| Intellias | Digital banking modernization and integrated financial platforms | — | 2002 | 1,001–5,000 employees |
| Andersen | Custom account information and open banking software | Warsaw, Poland | 2007 | 1,001–5,000 employees |
| Innowise | Custom open banking platform engineering | Warsaw, Poland | 2007 | 1,001–5,000 employees |
| ScienceSoft | Enterprise financial software and analytics | McKinney, TX, USA | 1989 | 501–1,000 employees |
| Itransition | Custom financial portals and banking applications | — | 1998 | 1,001–5,000 employees |
| Softjourn | Financial data provider integrations and fintech modernization | Fremont, CA, USA | 2001 | 201–500 employees |
| N-iX | Bank modernization and integrated financial platforms | Valletta, Malta | 2002 | 1,001–5,000 employees |
How to Choose an Account Aggregation Development Company
Most account aggregation projects do not build bank connections from scratch. They integrate one or more aggregation networks into a lending, wealth or personal finance product. The partner you pick should understand how those networks behave in production, how consent works in your markets, and how to turn raw account data into decisions.
Hands-on aggregator experience. Ask which aggregation APIs the team has shipped to production, such as Plaid, MX, Tink, Yodlee or Finicity, and in which countries. Request a walkthrough of a past integration: how they handled webhooks, token refresh, institution outages and re-authentication. A team that has only used sandbox environments will underestimate the work of keeping live connections stable.
Multi-provider and fallback design. Coverage and connection quality vary by institution and region, so many products end up using more than one network. Check whether the partner designs a provider-agnostic data layer, routes institutions to the best-performing source, and can switch providers without rewriting the app. Ask how they would monitor success rates per institution and alert on degradation.
Consent and regulatory knowledge. Your obligations depend on where you operate: PSD2 and its successors in Europe, the UK open banking framework, or the CFPB's personal financial data rights rule in the US. A good partner can explain consent capture, renewal periods, revocation and data retention for your markets, and builds consent screens and audit logs that a compliance team can review.
Data normalization and enrichment. Raw transactions arrive in different formats, with messy merchant names and inconsistent categories. Ask how the team normalizes accounts and transactions across providers, deduplicates records, and handles pending versus posted items. If you need cash-flow analysis or income verification, look for experience building categorization, recurring-payment detection and income models, not only data display.
Security of financial credentials and data. Aggregated data is sensitive, and access tokens are effectively keys to customer accounts. Check how tokens are encrypted and stored, how access is segregated between environments, and whether the partner has worked under SOC 2, ISO 27001 or PCI DSS controls. Ask for their approach to logging that avoids writing account numbers or balances into application logs.
Ongoing maintenance model. Aggregation integrations need continuous upkeep as providers change APIs, institutions migrate to new connection methods and regulations evolve. Ask what support looks like after launch: who watches connection health, how quickly API deprecations are handled, and whether the team documents the integration well enough for your own engineers to take it over.
Conclusion
Account aggregation is moving beyond displaying balances and transactions in one place. Financial institutions increasingly need consent controls, stable data access, and the ability to turn raw financial records into useful decisions. An aggregation network provides the underlying connections, while software engineering determines how that information fits into a working product. Coverage and data permissions should be tested against real customer journeys before committing to an architecture. Clear ownership of security, error handling, and continuing integration maintenance matters as much as the initial connection experience.
Frequently Asked Questions
How much does it cost to build an account aggregation feature?
A focused integration of one aggregation API into an existing app typically costs far less than a full product, often in the tens of thousands of dollars, while a multi-provider platform with enrichment and analytics can reach several hundred thousand. The main drivers are the number of providers and markets, data enrichment needs, consent and compliance work, and whether you also pay per-connection fees to the aggregation network.
How long does an account aggregation integration take?
A basic integration that links accounts and shows balances and transactions often takes a few weeks to two months. Projects that add multiple providers, transaction categorization, income or cash-flow analysis, and formal security review usually run three to six months. Provider contracting and production access approvals can add time, so start those conversations early.
Should we build our own bank connections or use an aggregator?
Most companies should use an aggregator. Building and maintaining direct connections to many institutions requires licensing in some markets, bank partnerships and constant upkeep. Direct API connections make sense mainly for a small number of high-volume institutions or when you already hold the necessary regulatory permissions. A common pattern is an aggregator for broad coverage plus a few direct integrations where quality matters most.
Do we need a license to use account aggregation?
It depends on the market and your role. In the EU and UK, accessing account data under open banking rules generally requires registration as an account information service provider, unless you rely on a licensed aggregator acting as the regulated party. In the US, the CFPB's data rights rule sets obligations for data access and use. Confirm your position with legal counsel before choosing an architecture.
What should we prepare before hiring a development partner?
Define the use case precisely, such as onboarding, underwriting, budgeting or wealth views, and the markets and institutions you must cover. List the data you actually need, your existing systems, and any compliance requirements. If you already have accounts with aggregation providers, share contract terms and usage limits. This lets a partner estimate scope accurately and recommend providers that fit.