Luxembourg's financial sector creates demand for developers that understand banking systems, payments, investment management, compliance, AML/KYC, and regulated data. The companies below combine software engineering with financial technology expertise and either maintain a Luxembourg presence or provide clearly defined services to the European financial market.
1. Itexus
Itexus builds custom fintech software for banks, investment firms, brokers, insurers, and financial technology companies. It develops mobile and online banking, digital wallets, lending systems, and trading platforms. Its work also covers wealth management software, digital assets, insurance applications, and financial analytics.
Itexus connects products to payment providers, KYC and AML platforms, banking APIs, and market data services. It also integrates brokers, exchanges, and legacy core banking systems. The company serves financial organizations across Europe as part of its international delivery. It fits Luxembourg businesses that do not need their engineering team to sit locally.
Key Facts
- Best for: Banks, fintech companies, brokers, wealth managers, and financial organizations developing complex products.
- Core services: Fintech software development, fintech apps, product discovery, UI/UX, AI implementation, DevOps, QA, cybersecurity, and support.
- Fintech areas: Banking, payments, lending, trading, investment management, digital assets, and insurance.
- Location coverage: Europe, North America, the UK, MENA, and other international markets.
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: Twarda 14, 00-824 Warszawa, Poland
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
2. Kreios
Kreios is a Luxembourg company that combines custom software engineering with RegTech development. Its software factory designs, builds, and maintains web applications and enterprise systems. Its REGMATIX platform handles regulatory oversight for financial institutions.
Kreios also works with Luxembourg's investment fund sector. In 2026, it announced cooperation with the Association of the Luxembourg Fund Industry to digitalize regulatory operations and compliance processes. Fund managers, financial institutions, and teams building compliance-heavy platforms get both custom development and knowledge of financial regulation.
Key Facts
- Best for: RegTech, investment fund, compliance, and regulated financial software projects.
- Core services: Custom software development, enterprise systems, software maintenance, and RegTech.
- Financial focus: Regulatory reporting, fund compliance, document controls, and financial regulation.
- Location: Sandweiler, Luxembourg.
Contact Information
- Website: www.kreios.lu
- Email: ul.soierk@ofni
- Phone: +352 27 95 85 20
- Address: 23, Rue du Cimetiere, L-5214 Sandweiler, Luxembourg
- LinkedIn: www.linkedin.com/company/kreios-regmatix
3. InTech
InTech has worked on technology projects for Luxembourg's financial sector for more than two decades. In finance, it has built investment fund management systems and private banking customer relationship applications, and helped digitalize financial services.
Software development sits alongside architecture, technical consulting, mobile engineering, and information systems work. InTech also has mobile banking experience, including development connected with the Eboo digital banking solution. Its background fits established banks, financial institutions, and fintech teams that are modernizing existing systems.
Key Facts
- Best for: Financial institutions requiring local development and financial-sector knowledge.
- Core services: Software development, architecture consulting, mobile development, and IT project delivery.
- Financial experience: Investment funds, private banking, digital financial services, and banking applications.
- Location: Kayl, Luxembourg.
Contact Information
- Website: www.intech.lu
- Phone: +352 53 11 53-1
- Address: 208, rue de Noertzange, L-3670 Kayl, Luxembourg
- LinkedIn: www.linkedin.com/company/intech
- Facebook: www.facebook.com/InTechLuxembourg
- Instagram: www.instagram.com/intech_lux
- Twitter: x.com/intech_lux
4. Deepy
Deepy is a Luxembourg custom software company that builds web, mobile, cloud, backend, API, and data projects. Its fintech work includes AML/KYC applications, InsurTech compliance systems, and projects for European fintech organizations.
Its stack includes React, Next.js, Node.js, Python, PostgreSQL, and AWS, plus mobile, APIs, cloud infrastructure, and security. Fintech startups and scale-ups can work with Deepy from an early MVP through production. It is a good match when the product involves identity checks, regulatory workflows, or secure financial data.
Key Facts
- Best for: Fintech startups and scale-ups developing web, mobile, or cloud products.
- Core services: Web and mobile development, backend engineering, APIs, cloud, DevOps, AI, and security.
- Fintech experience: AML/KYC and regulated InsurTech projects.
- Location: Esch-sur-Alzette, Luxembourg.
Contact Information
- Website: www.deepy.lu
- Email: ul.ypeed@tcatnoc
- Phone: +352 28 99 38 58
- Address: 6C, Porte de France, L-4360 Esch-sur-Alzette, Luxembourg
- LinkedIn: www.linkedin.com/company/deepy
5. Abacus
Abacus is based in Luxembourg and offers software engineering, solution architecture, application integration, and regulatory programs. It also handles infrastructure and project delivery. Financial services and fintech are among its sectors, and it has experience in European banking environments.
Its engineers build custom applications and data quality systems, design databases, and set up regulatory reporting. Abacus is a better fit for complex financial infrastructure, modernization, and integration work than for a simple consumer app.
Key Facts
- Best for: Banks and financial organizations with complex architecture, data, or integration requirements.
- Core services: Software engineering, solution architecture, project delivery, applications, integration, and data architecture.
- Industries: Financial services, fintech, private equity, public sector, and other regulated organizations.
- Location: Kopstal, Luxembourg.
Contact Information
- Website: abac.lu
- Email: ul.caba@tcatnoc
- Phone: +352 26 38 99 75
- Address: 96, route de Mersch, L-8181 Kopstal, Luxembourg
6. Jiway
Jiway builds financial software for banks and other financial professionals from its base in Luxembourg. Its MozaIK platform offers modular solutions that connect to core banking systems. They handle customer relationship management, document management, automated workflows, and other banking processes.
For more than 15 years, Jiway has worked with private and universal banks in Luxembourg and abroad. It combines software development, banking process automation, regulatory support, and system integration. Financial institutions that need to extend their existing banking infrastructure are its main audience.
Key Facts
- Best for: Banks and financial institutions extending or modernizing existing banking systems
- Core services: Financial software development, banking system integration, workflow automation, document management, and business relationship management
- Specialization: Modular banking applications and core banking extensions
- Financial focus: Private banking, universal banking, regulatory processes, and financial operations
- Location: Windhof, Luxembourg
Contact Information
- Website: jiway.lu
- Email: ul.yawij@ofni
- Phone: +352 26 84 54 61
- Address: Building SolarWind, 13, rue de l’Industrie, L-8399 Windhof
- LinkedIn: www.linkedin.com/company/jiway
7. Worldline
Worldline's Luxembourg operation provides technology for payments and financial institutions. In digital banking, it builds mobile banking apps for iOS, Android, and web, covering everything from UX/UI to product delivery.
Beyond apps, Worldline runs payment processing and issuing, and offers digital banking, open banking, and secure financial data exchange. Its Luxembourg entity also operates SOFiE, which businesses and banks use to exchange files securely.
Key Facts
- Best for: Banks, payment providers, and financial institutions.
- Core services: Digital banking applications, payments, issuing, open banking, and financial integrations.
- Specialization: Banking and payment infrastructure.
- Location: Bertrange, Luxembourg.
Contact Information
- Website: worldline.com
- Phone: +352 355 66 444
- Address: Atrium Business Park, 33, rue du Puits Romain, 8070 Bertrange, Luxembourg
- LinkedIn: www.linkedin.com/showcase/worldline-merchant-services
- Facebook: www.facebook.com/WorldlineMerchantServices
- Instagram: www.instagram.com/worldline
8. Deloitte
Deloitte combines financial services consulting with software engineering and systems integration. Its Luxembourg Avaloq practice supports digital banking transformation. The team handles architecture, technical design, data migration, API integration, and configuration, as well as custom software development, testing, and implementation.
Deloitte Engineering adds product software development and application modernization. This setup suits larger banking and wealth management projects. In those, engineering must line up with operating models, regulation, platform selection, and organizational change.
Key Facts
- Best for: Large banks, wealth managers, and financial institutions undertaking platform transformation.
- Core services: Custom software, system integration, architecture, data migration, testing, and engineering.
- Financial technology: Digital banking, Avaloq implementation, APIs, and financial platform modernization.
- Location: Luxembourg.
Contact Information
- Website: www.deloitte.com
- Address: 5 Avenue de la Fonte, L-4364 Esch-sur-Alzette, Luxembourg
- Phone: +352 45145 1
- LinkedIn: www.linkedin.com/company/deloitte
- Facebook: www.facebook.com/Deloitte
- Instagram: www.instagram.com/deloittelu
9. CGI
CGI has operated in Luxembourg for more than 20 years and works with banks, insurers, public bodies, and other organizations. Locally, it handles IT development and application maintenance. It also works on APIs, DevOps, data, automation, and digital transformation.
Financial technology is a large part of CGI's wider business. The company builds banking software for payments, fraud detection, AML, KYC, customer due diligence, and credit operations. Institutions that want both application engineering and established banking platforms can get them from one vendor.
Key Facts
- Best for: Banks and insurers requiring enterprise-scale development and application maintenance.
- Core services: IT development, application maintenance, APIs, DevOps, automation, and consulting.
- Fintech capabilities: Payments, fraud detection, AML, KYC, and banking platforms.
- Location: Bertrange, Luxembourg.
Contact Information
- Website: www.cgi.com
- Phone: +352 265 147 20
- Address: 7 zone d'activité de Bourmicht, Luxembourg, 8070
- LinkedIn: www.linkedin.com/company/cgi
- Facebook: www.facebook.com/CGIGroup
- Twitter: x.com/cgi_global
10. Aubay
Aubay works on critical applications and digital transformation projects across Europe. Its Luxembourg operation serves the local financial industry. Recent Luxembourg technical roles show direct work on retail banking and digital banking applications.
Its engineers build .NET applications, Java and Angular systems, backend services, APIs, and microservices. They also work with SQL, testing, and production deployment. Aubay is a practical choice for banks and financial organizations that need engineers to extend existing platforms.
Key Facts
- Best for: Banking application development, maintenance, and digital transformation.
- Core services: Application development, backend engineering, APIs, microservices, and software maintenance.
- Technologies: .NET, C#, Java, Angular, SQL, REST, and SOAP.
- Location: Luxembourg City and the Luxembourg financial market.
Contact Information
- Website: www.aubay.com
- Phone: +35 (0)2 299 25 01
- Address: 38, Parc d'Activités, L-8308 Capellen
- LinkedIn: www.linkedin.com/company/aubay
- Facebook: www.facebook.com/AubayFrance
- Instagram: www.instagram.com/aubayfrance
- Twitter: x.com/groupeaubay
11. Sword Technologies
Sword Technologies builds custom enterprise software from its Luxembourg operation. Locally, it offers software analysis and design, full-stack development, data and AI, and project management. It also works on digital transformation and customer communication platforms.
In Luxembourg, Sword currently runs banking projects built on Oracle FLEXCUBE. Its developers handle integration, development, configuration, and technical delivery for core banking environments. So Sword brings both custom engineering and hands-on financial software work.
Key Facts
- Best for: Enterprise financial applications and core banking development.
- Core services: Custom enterprise software, analysis, design, project management, data, and AI.
- Banking technology: Oracle FLEXCUBE development, integration, and configuration.
- Location: Windhof, Luxembourg.
Contact Information
- Website: www.sword-group.com
- Phone: +352 26 11 26 11
- Address: 2, Rue d’Arlon, L-8399 Windhof, Luxembourg
- LinkedIn: www.linkedin.com/company/sword-group
- Facebook: www.facebook.com/SwordGroup
- Twitter: x.com/sword_group
12. Finologee
Finologee builds digital finance and RegTech platforms for banks, asset servicing firms, insurers, payment providers, and other regulated organizations. The Luxembourg company works on banking connectivity, professional payments, and KYC and AML processes. It also builds regulatory APIs and financial data exchange.
Finologee builds and runs its own products. BKO is a banking connectivity and payments platform. KYC Manager handles digital onboarding and customer lifecycle management, and the company also offers regulatory solutions for financial institutions. Its teams work with APIs, cloud infrastructure, DevSecOps, and continuous delivery, and adapt products to Luxembourg's regulated financial environment.
Key Facts
- Best for: Banks, asset managers, payment providers, and regulated financial institutions
- Core services: Fintech software development, banking platforms, payment technology, KYC/AML software, regulatory APIs, and financial integrations
- Specialization: Digital banking infrastructure, RegTech, professional payments, and financial data exchange
- Location: Leudelange, Luxembourg
- Notable strength: Development and operation of regulated financial platforms for the Luxembourg market
Contact Information
- Website: finologee.com
- Email: moc.eegolonif@ofni
- Phone: +352 27 75 08-1
- Address: 7, rue Jean Fischbach, L-3372 Leudelange, Luxembourg
- LinkedIn: www.linkedin.com/company/finologee
- Facebook: www.facebook.com/finologee
- Instagram: www.instagram.com/finologee_sa
13. ITSS
ITSS specializes in banking software and technology services, with deep knowledge of the Temenos ecosystem. It handles core banking transformation, financial integrations, and payments modernization. It also works on fund administration technology, development support, and software maintenance.
Besides implementing partner platforms, ITSS builds bespoke banking software. Its Luxembourg entity in Windhof works on financial software, system integration, and custom development. The Windhof team also covers product development, testing, and application services.
Key Facts
- Best for: Temenos projects, core banking transformation, and financial platform modernization.
- Core services: Banking software development, system integration, product development, testing, implementation, and maintenance.
- Financial focus: Core banking, payments, fund administration, asset management, and fintech integrations.
- Location: Windhof, Luxembourg.
Contact Information
- Website: www.itssglobal.com
- Address: 6 Rue D'arlon, L-8399 Windhof
- LinkedIn: www.linkedin.com/company/itss
- Instagram: www.instagram.com/itss.global
- Twitter: x.com/TeamITSS
14. Luxapps
Luxapps builds business software, web applications, mobile apps, and custom platforms in Luxembourg. Its platforms include applications for fiduciaries, compliance, KYC/AML, finance, and other regulated activities.
The company offers iOS and Android development, progressive web apps, business API integrations, maintenance, and EU-based hosting. Fintech is not its only focus. Still, its custom development, KYC/AML workflows, compliance tools, and finance applications make it a clear option for regulated software projects.
Key Facts
- Best for: Luxembourg businesses needing locally developed, compliance-focused applications.
- Core services: Custom platforms, web development, mobile apps, API integration, and maintenance.
- Financial capabilities: Fiduciary software, finance applications, KYC/AML, and compliance workflows.
- Location: Kahler, Luxembourg.
Contact Information
- Website: luxapps.lu
- Email: ul.sppaxul@ofni
- Address: 2 rue de l'École, L-8376 Kahler, Luxembourg
15. ARHS Group
ARHS Group offers bespoke software development and IT engineering from Luxembourg. It builds enterprise applications, web platforms, mobile apps, and data systems. It also handles system integration, cloud solutions, and digital trust technologies.
Financial services are part of its Luxembourg work. ARHS engineers build banking applications in Java and modernize existing systems, with attention to security, performance, and integration. ARHS Cube holds PSF status in Luxembourg, which supports the group's work with regulated financial firms. ARHS Group is now part of Accenture.
Key Facts
- Best for: Banks and financial institutions requiring custom enterprise software development
- Core services: Bespoke software development, system integration, mobile development, cloud, data engineering, and digital trust
- Financial focus: Banking applications and regulated financial-sector IT
- Location: Belvaux, Luxembourg
- Notable strength: Custom development combined with experience working in Luxembourg's regulated financial sector
Contact Information
- Website: www.arhs-group.com
- Email: moc.puorg-shra@ofni
- Phone: +352 26 11 02 1
- Address: 13, Boulevard du Jazz, L-4370 Belvaux, Luxembourg
Conclusion
Luxembourg offers a strong mix of fintech specialists, software engineering firms, and larger technology providers serving banks, investment companies, payment businesses, and other regulated financial organizations. The right choice depends on the project, whether the priority is custom fintech development, banking modernization, payments, RegTech, KYC/AML, core system integration, or financial data platforms. Comparing each company's technical capabilities, financial-sector experience, and delivery model can help businesses identify a development partner that fits both their product requirements and regulatory environment.