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 focuses on custom fintech software for banks, investment firms, brokers, insurers, and financial technology companies. Its development work covers mobile and online banking, digital wallets, lending systems, trading platforms, wealth management software, digital assets, insurance applications, and financial analytics.
The company also handles integrations with payment providers, KYC and AML platforms, banking APIs, market data services, brokers, exchanges, and legacy core banking systems. Itexus works with financial organizations across Europe as part of its wider international delivery coverage, which makes it suitable for Luxembourg businesses that do not require their engineering team to be based 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: Żurawia 6/12/lok 766, 00-503, 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 combines custom software engineering with RegTech development from Luxembourg. Its software factory designs, builds, and maintains web applications and enterprise systems, while its REGMATIX platform focuses specifically on regulatory oversight for financial institutions.
The company also works with Luxembourg's investment fund ecosystem. In 2026, Kreios announced cooperation with the Association of the Luxembourg Fund Industry on digitalizing regulatory operations and compliance processes. This mix of custom development and financial regulation knowledge is particularly applicable to fund managers, financial institutions, and businesses building compliance-heavy platforms.
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. Its finance experience includes investment fund management systems, private banking customer relationship applications, and the digitalization of financial services.
Software development forms part of its broader project delivery model, alongside architecture, technical consulting, mobile engineering, and information systems work. InTech also has experience with mobile banking, including development connected with the Eboo digital banking solution. This makes its background particularly applicable to established banks, financial institutions, and fintech teams 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-based custom software company working on web, mobile, cloud, backend, API, and data projects. Its fintech experience includes AML/KYC applications, InsurTech compliance systems, and work for European fintech organizations.
The engineering stack covers React, Next.js, Node.js, Python, PostgreSQL, AWS, mobile development, APIs, cloud infrastructure, and security. That combination can suit fintech startups and scale-ups building a product from an early MVP through production, particularly when the project 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 operates from Luxembourg and covers software engineering, solution architecture, application integration, regulatory programs, infrastructure, and project delivery. Financial services and fintech are among the sectors it works with, including experience involving European banking environments.
Its engineering scope stretches from custom applications and data quality systems through database architecture and regulatory reporting. The company is therefore more suited to complex financial infrastructure, modernization, and integration work than to a straightforward consumer app project.
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 develops financial software for banks and other financial professionals from its base in Luxembourg. Its MozaIK platform provides modular solutions that connect with core banking systems and support customer relationship management, document management, automated workflows, and other banking processes.
The company has worked with private and universal banks in Luxembourg and international markets for more than 15 years. Its combination of software development, banking process automation, regulatory support, and system integration makes it suitable for financial institutions that need to extend existing banking infrastructure.
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. Its digital banking capabilities include mobile banking applications spanning iOS, Android, and web, with support covering UX/UI through product delivery.
Beyond app development, Worldline provides payment processing, issuing, digital banking, open banking, and secure financial data exchange services. Its Luxembourg entity also operates SOFiE, which is used by businesses and banks 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, covering architecture, technical design, data migration, API integration, configuration, custom software development, testing, and implementation.
Deloitte Engineering expands that scope to product software development and application modernization. The combination is particularly suited to larger banking and wealth management projects in which engineering has to be coordinated with operating models, regulation, platform selection, and organizational transformation.
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 maintained operations in Luxembourg for more than 20 years and works with banks, insurers, public bodies, and other organizations. Its local services include IT development and application maintenance, alongside APIs, DevOps, data, automation, and digital transformation.
Financial technology is a substantial part of CGI's wider product and services portfolio. The company develops banking software covering payments, fraud detection, AML, KYC, customer due diligence, and credit operations. This breadth can suit institutions looking for both application engineering and established banking platforms.
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, with a Luxembourg operation serving the local financial industry. Its recent Luxembourg technical roles show direct involvement in retail banking and digital banking application development.
The work includes .NET applications, Java and Angular systems, backend services, APIs, microservices, SQL, testing, and production deployment. This is a practical fit for banks and financial organizations that need engineering teams 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 provides custom enterprise software development from its Luxembourg operation. Its local capabilities include software analysis and design, full-stack development, data and AI, project management, digital transformation, and customer communication platforms.
The company's current Luxembourg activity also includes banking projects built around Oracle FLEXCUBE. Its developers work on integration, development, configuration, and technical delivery for core banking environments. This gives Sword a direct connection to both custom engineering and financial software.
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 develops digital finance and RegTech platforms for banks, asset servicing firms, insurers, payment providers, and other regulated organizations. Based in Luxembourg, its engineering work covers banking connectivity, professional payments, KYC and AML processes, regulatory APIs, and financial data exchange.
The company builds and operates products such as BKO, a banking connectivity and payments platform, KYC Manager for digital onboarding and customer lifecycle management, and regulatory solutions for financial institutions. Its development approach includes APIs, cloud infrastructure, software engineering, DevSecOps, and continuous delivery, with products adapted 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 focuses on banking software and technology services, with particular depth in the Temenos ecosystem. Its capabilities include core banking transformation, financial integrations, payments modernization, fund administration technology, development support, and software maintenance.
ITSS also develops bespoke banking software in addition to implementing partner platforms. The company maintains a Luxembourg entity in Windhof, where its local activity includes financial software, system integration, custom development, 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 develops business software, web applications, mobile apps, and custom platforms from Luxembourg. Its broader platform ecosystem includes applications for fiduciaries, compliance, KYC/AML, finance, and other regulated activities.
The company provides iOS and Android development, progressive web apps, business API integrations, maintenance, and EU-based hosting. Its work does not focus exclusively on fintech, but the combination of custom development, KYC/AML workflows, compliance tooling, and financial-sector applications gives it a clear place in 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 provides bespoke software development and IT engineering services from Luxembourg. Its development capabilities cover enterprise applications, web platforms, mobile applications, data systems, system integration, cloud solutions, and digital trust technologies.
Financial services form part of its Luxembourg work. ARHS engineers work on banking applications that require Java development, modernization of existing systems, security, performance, and integration. ARHS Cube also holds PSF status in Luxembourg, supporting the group's work with organizations operating in the regulated financial sector. 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.