London is home to companies building software for banks, fintech businesses, and financial organisations that need secure platforms, integrations, and customer-facing products. This list covers providers working with banking applications, payment infrastructure, core system modernisation, and related financial technology projects.
1. Itexus
Itexus develops custom banking and fintech software for financial organisations, including banks, fintech companies, investment businesses, and other regulated service providers. Its banking projects cover digital banking platforms, payment solutions, lending systems, digital wallets, customer onboarding, KYC workflows, card management, and integrations with existing financial infrastructure.
The company works on both new financial products and the modernisation of existing systems. Its development scope includes web and mobile applications, backend platforms, cloud solutions, data engineering, quality assurance, and integration with banking APIs and third-party services.
Key Facts
- Best for: Banks and fintech companies building custom financial platforms
- Core services: Banking software development, fintech applications, payment systems, lending platforms
- Specialization: Digital banking, financial integrations, regulated software products
- Location: Global delivery with European development offices
- Notable strength: Experience with complex fintech systems and banking workflows
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- Address: Żurawia 6/12/lok 776, 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. ELEKS
ELEKS provides software engineering services for financial institutions, including banking applications, payment solutions, data platforms, and enterprise software. The company works with projects involving digital banking, customer portals, transaction processing, and integration with existing banking environments.
Its financial technology services include software architecture, application development, quality assurance, cybersecurity, cloud engineering, and data solutions. ELEKS also supports organisations that need to update older banking systems while maintaining operational stability.
Key Facts
- Best for: Financial organisations requiring custom engineering services
- Core services: Banking software, cloud solutions, data engineering, QA
- Specialization: Enterprise software and financial technology
- Industries: Banking, finance, insurance
- Location: London, UK
Contact Information
- Website: www.eleks.com
- Phone: +44-20-4583-0843
- Email: moc.skele@ofniskele
- Address: Moor Place, 1 Fore Street Avenue, London, United Kingdom, EC2Y 9DT
- LinkedIn: www.linkedin.com/company/eleks
- Facebook: www.facebook.com/ELEKS.Software
- Twitter: x.com/ELEKSSoftware
3. Andersen
Andersen develops banking software for financial companies through its London presence. The company works on digital banking applications, payment systems, lending platforms, customer management solutions, and integrations between banking services.
Its teams support full-cycle development, from software design and architecture to implementation and maintenance. Andersen also works with technologies related to AML, KYC, PSD2, GDPR, cloud platforms, and banking system integrations.
Key Facts
- Best for: Banks needing custom software development and dedicated teams
- Core services: Digital banking, payment software, lending platforms, integrations
- Specialization: Financial software development and enterprise applications
- Location: London, UK
- Notable strength: Experience with regulated software environments
Contact Information
- Website: andersenlab.com
- Phone: +44 207 048 6755
- Email: moc.balnesredna@nv
- Address: 1 St Katharine's Way, 6th floor, London E1W 1YL, UK
- LinkedIn: www.linkedin.com/company/andersen-lab
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
- Instagram: www.instagram.com/andersen.global
4. Vention
Vention provides software development services for fintech and banking companies, supporting projects related to payments, digital banking, investment platforms, and financial applications. Its London team works with businesses that need additional engineering capacity or complete product development support.
The company develops APIs, backend systems, mobile applications, and platforms connected to financial services. Its work includes open banking integrations, system modernisation, and development support for companies building regulated financial products.
Key Facts
- Best for: Fintech companies requiring flexible engineering support
- Core services: Banking applications, APIs, software development, modernisation
- Specialization: Fintech, payments, investment software
- Location: London, UK
- Notable strength: Supports different engagement models
Contact Information
- Website: ventionteams.com
- Phone: +442071172842
- Email: moc.smaetnoitnev@olleh
- Address: London, 30 Churchill Place, E14 5RE
- LinkedIn: www.linkedin.com/company/ventionteams
- Twitter: x.com/ventionteams
- Instagram: www.instagram.com/ventionteams
5. Scott Logic
Scott Logic works with financial organisations on software engineering, technology consulting, cloud solutions, and digital product development. The company has experience with banking environments where reliability, security, and integration with existing systems are important.
Its services include application development, platform modernisation, data solutions, architecture consulting, and customer experience design. The company works with banks and financial organisations that need structured technology changes rather than isolated software projects.
Key Facts
- Best for: Banks modernising complex technology environments
- Core services: Software engineering, cloud, data, application modernisation
- Specialization: Enterprise financial systems
- Industries: Banking, finance, government
- Location: London, UK
Contact Information
- Website: www.scottlogic.com
- Phone: +44 20 3787 4085
- Email: moc.cigolttocs@yrag
- Address: Office 0109, Cannon Green, 27 Bush Lane, London, EC4R 0AN
- LinkedIn: www.linkedin.com/company/scott-logic-limited
6. Appinventiv
Appinventiv develops fintech and banking software for organisations that need mobile applications, web platforms, backend systems, and digital financial products. Its London presence supports projects for financial companies working on customer applications and internal banking tools.
The company combines software engineering with cloud, AI, data analytics, and cybersecurity capabilities. Its banking-related projects can include automation, reporting systems, payment features, and applications built around specific financial workflows.
Key Facts
- Best for: Financial businesses developing digital products
- Core services: Banking software, mobile apps, backend development
- Specialization: Fintech applications and digital platforms
- Location: London, UK
- Notable strength: Combination of product development and emerging technologies
Contact Information
- Website: appinventiv.com
- Phone: + 44 - 753 - 900 - 0641
- Address: 3rd Floor, 86-90 Paul Street, EC2A 4NE London, UK
- LinkedIn: www.linkedin.com/company/appinventiv
- Twitter: x.com/appinventiv
- Instagram: www.instagram.com/appinventiv
7. Limeup
Limeup develops banking applications and financial software from its London office. The company works on digital banking platforms, eWallets, payment solutions, account management systems, and customer-facing financial applications.
Its projects include UX design, frontend and backend development, API integrations, security testing, and ongoing product support. Limeup focuses on custom solutions that connect with existing financial systems.
Key Facts
- Best for: Companies creating customer-facing banking products
- Core services: Banking apps, payment solutions, UX/UI design, integrations
- Specialization: Digital financial products
- Location: London, UK
- Notable strength: Focus on custom banking applications
Contact Information
- Website: limeup.io
- Phone: +44 20 8135 6600
- Email: oi.puemil@olleh
- Address: Queens House, 180 Tottenham Ct Rd, London W1T 7PD
- LinkedIn: www.linkedin.com/company/limeup
- Facebook: www.facebook.com/limeup.io
- Twitter: x.com/limeup\_io
- Instagram: www.instagram.com/limeup.io
8. TatvaSoft
TatvaSoft provides custom software development services for financial organisations through its UK operations. Its banking-related work includes lending platforms, financial workflows, reporting systems, and applications supporting business processes.
The company develops web and mobile applications, cloud solutions, and enterprise platforms. Its experience includes software maintenance, application modernisation, and development team support.
Key Facts
- Best for: Financial organisations needing custom enterprise software
- Core services: Financial software, web applications, cloud development
- Specialization: Business process automation and enterprise systems
- Location: London, UK
- Notable strength: Long-term software development support
Contact Information
- Website: www.tatvasoft.com
- Phone: +44 742 409 8452
- Email: moc.tfosavtat@ofni
- Address: 307, Euston Road, London NW1 3AD, United Kingdom
- LinkedIn: www.linkedin.com/company/tatvasoft
- Facebook: www.facebook.com/TatvaSoft
- Twitter: x.com/tatvasoft
9. N-iX
N-iX provides software engineering services for financial organisations, including banking system modernisation, payment integrations, data platforms, and automation solutions. The company works with businesses that need support with complex technology environments.
Its banking-related services include API connectivity, compliance automation, customer lifecycle management, risk solutions, and cloud transformation.
Key Facts
- Best for: Banks modernising technology infrastructure
- Core services: Banking software, cloud, integrations, data solutions
- Specialization: Enterprise financial technology
- Location: London, UK
- Notable strength: Experience with large-scale software projects
Contact Information
- Website: www.n-ix.com
- Phone: +442037407669
- Email: moc.xi-n@tcatnoc
- 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
10. Itransition
Itransition develops software for financial organisations, including banking platforms, payment systems, analytics solutions, and enterprise applications. Its teams work on custom development, integration, and modernisation projects.
The company supports both customer-facing banking products and internal financial systems. Its capabilities include application development, cloud solutions, data analytics, and automation.
Key Facts
- Best for: Organisations improving existing banking software
- Core services: Banking systems, integrations, cloud development
- Specialization: Enterprise application development
- Location: London, UK
- Notable strength: Experience with complex software environments
Contact Information
- Website: www.itransition.com
- Phone: +447464999606
- Email: moc.noitisnarti@ofni
- Address: Office 3-01, 3rd Floor, 3 Shortlands, W6 8DA
- LinkedIn: www.linkedin.com/company/itransition
- Facebook: www.facebook.com/Itransition
- Twitter: x.com/itransition
11. Zudu
Zudu develops custom software products for businesses, including solutions for financial services. Its work covers mobile applications, web platforms, cloud systems, and digital products requiring secure user experiences.
The company supports projects from discovery and design through development and maintenance, making it suitable for organisations building customer-facing banking tools.
Key Facts
- Best for: Financial businesses creating digital products
- Core services: Custom software, mobile applications, cloud development
- Specialization: Digital platforms and applications
- Location: UK
- Notable strength: Product-focused development approach
Contact Information
- Website: zudu.co.uk
- Email: ku.oc.uduz@tcatnoc
- Address: Clockwise, Commercial Quay, 84 Commercial St, Leith, Edinburgh EH6 6LX
- LinkedIn: www.linkedin.com/company/zudu
- Instagram: www.instagram.com/zuduofficial
12. Waracle
Waracle creates digital products for regulated industries, including financial services. Its development work includes mobile applications, customer platforms, connected systems, and software designed around user-facing experiences.
The company combines product strategy, UX design, engineering, and cloud development for businesses working in financial and regulated markets.
Key Facts
- Best for: Companies building customer-focused financial products
- Core services: Mobile apps, digital platforms, software engineering
- Specialization: Digital product development
- Location: UK
- Notable strength: Experience with regulated industries
Contact Information
- Website: waracle.com
- Email: moc.elcaraw@gnitekram
- Phone: 0330 808 4436
- Address: 7 Harp Lane, London, EC3R 6DP
- LinkedIn: www.linkedin.com/company/waracle
- Facebook: www.facebook.com/waracle
- Twitter: x.com/WaracleUK
- Instagram: www.instagram.com/waracle
13. CGI
CGI provides software engineering and technology consulting services for financial organisations. The company works with banks and enterprises on software delivery, cloud adoption, data platforms, and technology transformation projects.
Its teams support organisations dealing with complex systems where reliability, security, and long-term maintainability are important factors.
Key Facts
- Best for: Large financial organisations requiring engineering expertise
- Core services: Software development, cloud, data, consulting
- Specialization: Enterprise technology delivery
- Location: London, UK
- Notable strength: Experience with large-scale software projects
Contact Information
- Website: www.cgi.com
- Phone: +44 (0)20 7637 9111
- Address: 14th Floor, 20 Fenchurch Street, London, EC3M 3BY
- LinkedIn: www.linkedin.com/company/cgi
- Facebook: www.facebook.com/cgigroup
- Twitter: x.com/cgi\_global
Conclusion
Banking software development projects require a balance between financial expertise, secure engineering practices, and the ability to connect new products with existing systems. Companies in this list cover different needs, from building digital banking applications and payment platforms to modernising complex banking infrastructure. The right choice depends on the project scope, regulatory requirements, technology environment, and level of development support required.