France has a broad fintech development market, ranging from focused financial software teams to large technology consultancies with dedicated banking practices. The companies below cover custom fintech platforms, digital banking, payments, lending, trading technology, core modernization, financial APIs, and regulated software engineering.
1. Itexus
Itexus develops custom fintech software for banks, brokers, fintech companies, investment businesses, and other financial organizations. Its work covers digital banking, lending, payments, wallets, wealth management, trading, onboarding, KYC, and financial analytics. The company also handles complex integrations and modernization of existing financial platforms. Itexus operates development offices in Europe and US and serves financial services organizations across the European market, making its delivery model accessible to companies in France. Its portfolio includes more than 300 fintech projects across 23 countries.
Key Facts
- Best for: Custom fintech products and complex financial platforms
- Core services: Fintech software development, fintech app development, legacy modernization, AI consulting, staff augmentation
- Specialization: Banking, trading, wealth management, payments, lending
- Technologies: Java, .NET, TypeScript, Python, cloud infrastructure
- Geographic coverage: France and the wider European market
- Notable strength: Experience with regulated, integration-heavy financial software
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. Sopra Steria
Sopra Steria has a substantial financial services practice covering banks and insurers in France. Its teams work on digital lending journeys, regulatory systems, customer-facing financial services, open finance, APIs, data and AI, and modernization of banking IT environments. Sopra Steria also operates dedicated financial software activities, including Sopra Financing Software and banking technology delivered through its wider software ecosystem. For financial institutions dealing with older systems, regulatory requirements, or large application estates, its combination of engineering and sector knowledge is particularly applicable.
Key Facts
- Best for: Large banking and financial transformation programs
- Core services: Financial software, systems modernization, open finance, API development, data and AI
- Specialization: Banking, insurance, lending, compliance
- Location: Multiple offices across France
- Notable strength: Combination of financial software products and custom technology services
Contact Information
- Website: www.soprasteria.com
- Address: ZAC de la Grande Plaine Bât C 6 rue Brindejonc des Moulinais BP15872, 31506 Toulouse
- LinkedIn: www.linkedin.com/company/soprasteria
- Instagram: www.instagram.com/soprasteria\_group
- Twitter: x.com/soprasteria\_fr
3. Capgemini
Capgemini combines software engineering with a dedicated banking technology practice. Its work includes core banking modernization, cloud-native applications, APIs, microservices, application integration, and complex software programs for financial services organizations. The company also supports banks with the design and implementation of modern core platforms, which makes it suitable for projects that extend beyond a standalone mobile application into wider banking infrastructure. Capgemini has a large French presence, including its France headquarters in Issy-les-Moulineaux and offices across numerous regions.
Key Facts
- Best for: Enterprise banking modernization
- Core services: Custom applications, core banking, cloud development, APIs, application integration
- Specialization: Banking technology and large enterprise systems
- Location: Extensive office network across France
- Notable strength: Ability to combine software engineering with large transformation programs
Contact Information
- Website: www.capgemini.com
- Phone: +33 1 57 99 00 00
- Address: 147 Quai du Président Roosevelt, 92130 Issy-les-Moulineaux, France
- LinkedIn: www.linkedin.com/company/capgemini
- Facebook: www.facebook.com/capgeminifrance
- Instagram: www.instagram.com/capgeminifr
4. Theodo FinTech
Theodo FinTech is one of the more focused options in France. Its financial services team designs and develops digital platforms for banks, fintech companies, investment funds, asset managers, and private banking organizations. Projects include banking apps, digital lending journeys, banking APIs, open finance products, embedded finance, and modernization of existing technology stacks. Client work includes Bpifrance, Qonto, Swan, Yomoni, and Milleis. Its Paris-based fintech practice combines product strategy, design, and software engineering rather than limiting its role to technology consulting.
Key Facts
- Best for: Fintech startups, banks, and new digital financial products
- Core services: Fintech development, mobile banking, APIs, embedded finance, platform modernization
- Specialization: Open finance, payments, lending, investment and banking software
- Location: Paris, France
- Notable strength: Dedicated Theodo FinTech engineering practice
Contact Information
- Website: www.theodo.com
- LinkedIn: www.linkedin.com/company/theodo
5. GFT Technologies
GFT has deep roots in banking technology and maintains a French operation in Niort. Its financial services practice works across banking, capital markets, asset management, and insurance. For banks, its capabilities include digital banking development, open banking infrastructure, API-first systems, cloud-native core platforms, AI, and legacy modernization. GFT also develops banking accelerators such as BankStart and BankLiteX, which can support institutions launching or rebuilding digital banking environments. The company is particularly suited to programs where custom engineering must connect with existing banking platforms or third-party core systems.
Key Facts
- Best for: Digital banking and core modernization
- Core services: Banking software engineering, APIs, cloud, AI, core transformation
- Specialization: Banking, capital markets, asset management
- Location: Niort, France
- Notable strength: Long-standing focus on financial technology
Contact Information
- Website: www.gft.com
- Address: 18 Avenue Leo Lagrange, 79000 Niort, France
- LinkedIn: www.linkedin.com/company/gft-technologies-france
- Facebook: www.facebook.com/gfttechnologies
- Instagram: www.instagram.com/GFT\_Tech
- Twitter: x.com/gft\_tech
6. CGI
CGI works with French banks and financial institutions on application development, systems integration, core modernization, payments, data, cloud, and financial technology transformation. Current banking projects in France involve full-stack Java, React, Angular, .NET, data engineering, and mainframe development for major banking environments. CGI also maintains proprietary financial products covering payments, trade finance, credit, compliance, and wealth management.
Key Facts
- Best for: Complex banking systems and enterprise financial software
- Core services: Application development, system integration, modernization, payments, cloud
- Specialization: Retail banking, investment banking, payments, wealth management
- Location: Offices across France
- Notable strength: Custom delivery combined with proprietary banking solutions
Contact Information
- Website: www.cgi.com
- Phone: 04 42 97 22 20
- Address: 355 Rue Louis de Broglie, Aix-en-Provence 13290
- LinkedIn: www.linkedin.com/company/cgi
- Instagram: www.instagram.com/cgi\_france
- Twitter: x.com/cgi\_fr
7. Inetum
Inetum supports financial institutions with application development, integration, modernization, digital platforms, payments, open finance, risk systems, and cloud-native banking technology. Its application services cover the complete software lifecycle, from building and integrating applications to modernizing legacy environments and operating them after deployment. Within financial services, the company works on digital onboarding, core banking modernization, payment ecosystems, regulatory requirements, and fraud-related technology. Inetum is headquartered in Saint-Ouen-sur-Seine and has a substantial French operation.
Key Facts
- Best for: Application modernization in established financial institutions
- Core services: Application development, integration, modernization, payments, cloud
- Specialization: Banking and financial services
- Location: Saint-Ouen-sur-Seine, France
- Notable strength: Full application lifecycle coverage
Contact Information
- Website: www.inetum.com
- Phone: +33 (0)1 44 04 50 00
- Address: 5-7 Rue Touzet Gaillard, 93400 Saint-Ouen, France
- LinkedIn: www.linkedin.com/company/inetum
- Instagram: www.instagram.com/inetum\_world
- Twitter: x.com/inetum\_world
8. Accenture
Accenture's French banking practice covers technology implementation alongside strategy and business transformation. Its work includes core banking modernization, open banking, open finance, payments, digital channels, lending technology, and cloud-based banking systems. The company also employs software engineers and technical architects specifically for financial services projects, including work with core banking platforms and digital payment environments. Its scale makes it particularly applicable to banks and larger fintech organizations that need engineering combined with architecture, integration, regulatory, data, or organizational work.
Key Facts
- Best for: Large financial institutions and multi-system transformations
- Core services: Banking software implementation, core modernization, open finance, cloud, integration
- Specialization: Banking and financial services
- Location: Paris, Lyon, Nantes, Sophia Antipolis
- Notable strength: Ability to combine engineering with large-scale transformation
Contact Information
- Website: www.accenture.com
- Address: 118 Avenue de France, 75013 Paris, France
- Phone: +33 1 53 23 55 55
9. Talan
Talan was founded in France and combines technology delivery with consulting, data, AI, cloud, and application services. Banking and financial services are among its established sectors, with teams working on digital transformation and technology programs for financial institutions. Its application services include building and integrating software solutions, while its broader technology organization handles architecture, data integration, cloud platforms, and large transformation projects. Talan has offices in Paris and several other French cities, making it a practical option for financial companies seeking local delivery and wider international capacity.
Key Facts
- Best for: Banking projects combining software, data, and transformation
- Core services: Application services, cloud, data, AI, systems integration
- Specialization: Banking and financial services
- Location: Paris and multiple French cities
- Notable strength: French delivery presence combined with international operations
Contact Information
- Website: www.talan.com
- LinkedIn: www.linkedin.com/company/talan
- Facebook: www.facebook.com/talan
- Instagram: www.instagram.com/talan\_world
- Address: 85 r Pierre Berthier, 13290 Aix en Provence
- Phone: +33 4 42 12 74 75
10. Groupe SII
Groupe SII provides software engineering and technology consulting through a substantial operation in France. Its current banking and finance work includes full-stack Java and Angular development for critical business applications, with responsibilities covering requirements analysis, backend development, user interfaces, testing, maintenance, and evolution of complex information systems. Its Île-de-France organization works with major enterprises on digital transformation, engineering, and technology programs.
Key Facts
- Best for: Engineering capacity for banking applications
- Core services: Software development, digital transformation, technology consulting
- Specialization: Enterprise and critical applications
- Financial capabilities: Banking and finance software development
- Location: Île-de-France and other French regions
Contact Information
- Website: sii-group.com
- Address: 8 Rue des Pirogues de Bercy, 75012 PARIS
- LinkedIn: www.linkedin.com/company/sii
- Instagram: www.instagram.com/Groupe\_SII
11. Aubay
Aubay focuses on application services and digital transformation, including work within the banking sector. Its French teams develop and maintain financial applications, including software used for treasury management and regulatory reporting. Current banking work covers application evolution, coding, unit and functional testing, deployment support, and modernization of existing systems. This makes Aubay a reasonable fit for established banks, financial institutions, and fintech teams that need developers to work inside complex existing technology environments. The company maintains French offices in Boulogne-Billancourt, Courbevoie, Nantes, Bordeaux, and Lyon.
Key Facts
- Best for: Banking application development and maintenance
- Core services: Application development, digital transformation, software engineering
- Specialization: Critical enterprise applications
- Financial capabilities: Treasury, regulatory and banking systems
- Location: Multiple French offices
Contact Information
- Website: aubay.com
- E-mail: moc.yabua@atad-tcatnoc
- Phone: +33 (0)1 46 10 67 67
- Address: 13 rue Louis Pasteur, 92100 Boulogne-Billancourt, France
- LinkedIn: www.linkedin.com/company/aubay-data-n-ai
12. ACCENSEO
ACCENSEO is a Paris-based software engineering and IT consulting company that develops custom applications for financial services organizations. Its fintech work includes modernizing transaction platforms, moving legacy systems toward cloud-native architectures, and integrating financial applications with core banking systems and third-party services. The company also develops customer portals, payment workflows, reporting tools, and reconciliation systems for financial businesses.
For companies dealing with established financial infrastructure, ACCENSEO can cover both new software development and the modernization of existing systems. Its services extend from architecture and engineering to integration, cloud infrastructure, maintenance, and ongoing application support.
Key Facts
- Best for: Custom fintech platforms and financial system modernization
- Core services: Custom software development, application modernization, solution integration, cloud services, maintenance
- Specialization: Financial services software and transaction platforms
- Financial capabilities: Payment workflows, reporting, reconciliation, core banking integrations
- Location: Paris, France
Contact Information
- Website: www.accenseo.com
- Email: moc.oesnecca@atsoc-ad.esoj
- Address: 60 Rue François 1er, 75008 Paris, France
- LinkedIn: www.linkedin.com/company/accenseo
13. VISEO
VISEO combines custom software development with financial markets technology. Its French services include modernization of business applications, custom development, application maintenance, data, AI, cloud, cybersecurity, and trading platform transformation. Within financial services, the company has expertise in capital markets technology and Murex, including complex IT transformation work for banks and financial organizations. This makes VISEO particularly suitable where custom software engineering needs to connect with trading, risk, finance, or established enterprise platforms. It is headquartered in Boulogne-Billancourt and has offices in several French cities.
Key Facts
- Best for: Capital markets and enterprise finance technology
- Core services: Custom development, application modernization, managed services, data and AI
- Specialization: Trading platforms and financial systems
- Location: Seven locations in France
- Notable strength: Murex and capital markets technology capabilities
Contact Information
- Website: www.viseo.com
- Phone: +33 01 56 56 71 00
- Address: 94-96, Rue de Paris, 92100 Boulogne-Billancourt
- LinkedIn: www.linkedin.com/company/viseo
- Instagram: www.instagram.com/viseogroup
14. Expleo
Expleo develops, tests, and maintains enterprise web and mobile applications, with banking and financial services among the sectors supported by its software engineering teams. The company reports developing more than 200 critical applications over the past decade across banking, insurance, financial services, and other industries. Its banking practice also covers application development, cloud modernization, digital channels, legacy modernization, system integration, quality engineering, and compliance. Expleo operates extensively in France and maintains an active French organization alongside its global engineering network.
Key Facts
- Best for: Regulated financial platforms requiring engineering and quality assurance
- Core services: Application development, cloud modernization, DevSecOps, testing, system modernization
- Specialization: Banking and financial services
- Location: France
- Notable strength: Software development combined with extensive testing and quality engineering
Contact Information
- Website: expleo.com
- Address: ZI de la Frayère, 4 allée des Cormorans, 06150, Cannes
- Phone: +33 458 052 556
- Email: info\moc.puorgoelpxe@ecnarf_
- LinkedIn: www.linkedin.com/company/expleo-group
- Facebook: www.facebook.com/expleogroup
- Instagram: www.instagram.com/expleo\_group
- Twitter: x.com/ExpleoGroup
15. ALTEN
ALTEN provides IT services and technology engineering to banking, finance, and insurance organizations. Its financial sector work covers mobile banking applications, integrated payment systems, open banking development, credit-risk tools, transaction-monitoring technology, and customer data platforms. A published French digital banking project also describes application architecture and software development delivered by full-stack developers alongside UX and functional specialists. France remains ALTEN's historic core market, with 16 strategic locations across the country and a large local engineering workforce.
Key Facts
- Best for: Large-scale banking engineering programs
- Core services: IT services, application development, digital banking, payments, data
- Specialization: Banking, finance and insurance
- Location: 16 locations across France
- Notable strength: Large French engineering footprint with dedicated financial sector capabilities
Contact Information
- Website: www.alten.com
- Address: 21 bis boulevard Jean Jaurès, 92100 Boulogne-Billancourt
- Phone: +33 1 46 08 70 00
- LinkedIn: www.linkedin.com/company/alten
- Facebook: www.facebook.com/AltenFrance
- Instagram: www.instagram.com/alten\_group
- Twitter: x.com/alten\_france
Conclusion
France offers a varied selection of fintech software development companies, from focused product engineering teams to large technology groups working with banks and financial institutions. The right choice depends on the project, whether it involves launching a new fintech product, modernizing legacy banking systems, building payment infrastructure, improving trading platforms, or integrating financial applications with existing systems. Comparing each company by fintech expertise, technical capabilities, delivery model, and experience with regulated financial software can help narrow the options to the most suitable development partner.