Businesses looking for fintech software development companies in London can choose from financial technology specialists, product development teams and larger engineering consultancies. This list covers companies with a London presence alongside providers serving the UK from other locations, with those differences identified in each entry. Compare their financial software experience, project focus and delivery services to find a suitable match for your requirements.
1. Itexus
Itexus builds financial software for banks, brokers, investment firms, and fintech businesses. It works on digital banking, trading platforms, wealth management, payments, and lending. It also builds the integrations that connect these products to financial infrastructure. The company is headquartered in the United States, has development offices in Europe, and serves the UK market.
A project can include product discovery, interface design, backend development, testing, and ongoing support. Itexus also modernizes legacy systems and recovers troubled projects. That makes it a fit both for extending an existing platform and for building a new financial product.
Key Facts
- Core services: Fintech software development, mobile applications, integrations, testing and maintenance.
- Financial domains: Banking, trading, wealth management, payments, lending and insurance.
- Project focus: New products, complex integrations and legacy system modernisation.
- Geographic coverage: US headquarters and European development offices, serving the UK market.
Contact Information
- Website: itexus.com
- E-mail: moc.suxeti@ofni
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- LinkedIn: www.linkedin.com/company/itexus-fintech-software
- Instagram: www.instagram.com/itexus.soft
- Address: 8, The Green, STE road, Dover, DE 19901
2. GoodCore
GoodCore builds bespoke financial software from its UK base in Croydon, Greater London. It offers fintech product development, cloud migration, API integration, and upgrades to existing systems. It built a loan management system for a UK loan provider, a useful reference for lenders choosing a supplier.
Its process runs from discovery and design through development, deployment, and maintenance. Besides new apps, GoodCore works on business-critical platforms that must stay online while their technology changes underneath. It can also integrate AI into existing systems.
Key Facts
- Core services: Bespoke development, cloud migration, API integration and ongoing support.
- Financial domains: Banking, lending, investing and payments.
- Relevant project: Loan management software for a UK loan provider.
- Location: Croydon, Greater London, UK.
Contact Information
- Website: www.goodcore.co.uk
- E-mail: ku.oc.erocdoog@tcatnoc
- Facebook: www.facebook.com/goodcoresoftware
- LinkedIn: www.linkedin.com/company/goodcore-software
- Address: Airport House, Purley Way, Croydon CR0 0XZ
- Phone: 020 8781 6903
3. Scott Logic
Scott Logic works with investment banks and capital markets firms on complex financial systems. Its UK-based consultants build trading apps and modernize legacy platforms. They also build data pipelines, analytics tools, and reporting workflows. The company has a London office and other UK locations.
It built the HTML5 charting component of SaxoTraderGO, a concrete example of interfaces used by traders. Scott Logic also works on operational resilience and the controls around financial software. That includes auditability and regulatory reporting requirements.
Key Facts
- Core services: Bespoke engineering, data platforms, legacy modernisation and testing.
- Specialisation: Capital markets and investment banking technology.
- Relevant project: HTML5 charting for SaxoTraderGO.
- Location: London office with additional UK teams.
Contact Information
- Website: www.scottlogic.com
- E-mail: moc.cigolttocs@snoitacilppa
- LinkedIn: www.linkedin.com/company/scott-logic-limited
- Address: Office 0109, Cannon Green, 27 Bush Lane, London, EC4R 0AN
- Phone: +44 20 3787 4085
4. A-listware
A-listware builds custom financial software and provides dedicated engineering teams. It delivers web apps, mobile products, and systems that combine both. Its clients work in banking, insurance, lending, and investment. Its UK base is in St Leonards-on-Sea, East Sussex, an option outside London for distributed delivery.
Besides development, A-listware offers quality assurance, infrastructure support, and cybersecurity. Consider it when you need extra engineering capacity, or development plus technical support. Its team model lets you add outside specialists to your own development team.
Key Facts
- Core services: Financial software development, dedicated teams, QA and technical support.
- Product types: Web applications, mobile applications and custom fintech systems.
- Financial domains: Banking, insurance, lending and investment.
Contact Information
- Website: a-listware.com
- E-mail: moc.erawtsil-a@ofni
- Facebook: www.facebook.com/alistware
- LinkedIn: www.linkedin.com/company/a-listware
- Address: St. Leonards-On-Sea, TN37 7TA, UK
- Phone: +44 (0)142 439 01 40
5. GFT Technologies
GFT Technologies helps financial institutions modernize core banking and adopt cloud technology. It also builds data platforms and does software engineering. Its London office is a local contact point for a larger international delivery team. Its clients include Deutsche Bank, for credit risk technology, and Salt Bank, for digital banking delivery.
GFT suits established institutions that are replacing or extending major systems. Its projects often change applications, infrastructure, and data together, not just one customer app. It also uses AI to support modernization and automation inside existing technology environments.
Key Facts
- Core services: Core banking modernisation, cloud delivery, data engineering and AI implementation.
- Project focus: Enterprise financial systems and banking transformation.
- Relevant clients: Deutsche Bank and Salt Bank.
Contact Information
- Website: www.gft.com
- Facebook: www.facebook.com/gfttechnologies
- Twitter: x.com/gft_tech
- LinkedIn: www.linkedin.com/company/gft-technologies
- Instagram: www.instagram.com/gft_tech
- Address: 9th floor, 107 Cheapside, London. EC2V 6DN
- Phone: +44 20 3372 9200
6. Kindgeek
Kindgeek offers custom fintech development, pre-built financial software, and dedicated teams. Its platforms cover neobanking, payments, personal finance management, and lending. The company works from London and Lviv, with a separate sales contact for London.
Buyers can commission a bespoke product or adapt Kindgeek's existing fintech infrastructure. It builds banking and payment apps, and Jaja Finance is one of its examples. Kindgeek also connects products to banking APIs, payment processors, and card networks. It provides advisory services and AI implementation too.
Key Facts
- Core services: Custom fintech development, white-label platforms, dedicated teams and consulting.
- Financial domains: Banking, payments, lending and personal finance management.
- Delivery options: Bespoke software or adaptation of pre-built platforms.
- Geographic presence: London and Lviv.
Contact Information
- Website: www.kindgeek.com
- E-mail: moc.keegdnik@selas
- Facebook: www.facebook.com/kindgeek
- Twitter: x.com/kindgeeks
- LinkedIn: www.linkedin.com/company/kindgeek
- Instagram: www.instagram.com/kindgeeks
7. Endava
Endava provides engineering and technology services for retail banking, commercial banking, and capital markets. Based in London, it helps financial institutions modernize core systems, use data better, and build customer-facing services. It also works in payments.
Its financial work includes organizational dashboards and cloud-based workflow systems. Endava fits programs where software development runs alongside infrastructure changes, data engineering, and operational improvement. It can also act as an extension of a bank's own team, while the bank keeps ownership of its technology strategy.
Key Facts
- Core services: Software engineering, core modernisation, data solutions and cloud delivery.
- Financial domains: Retail banking, commercial banking, capital markets and payments.
- Project focus: Financial institution transformation and enterprise delivery.
Contact Information
- Website: www.endava.com
- Facebook: www.facebook.com/endava
- LinkedIn: www.linkedin.com/company/endava
- Instagram: www.instagram.com/endava
- Address: 125 Old Broad Street, London, EC2N 1AR, UK
8. DataArt
DataArt builds and modernizes software for financial services firms, with a London office for its UK work. It covers banking, lending, asset management, capital markets, insurance, and payments. Typical work includes core platform upgrades, onboarding and KYC workflows, reporting systems, and financial data infrastructure.
The company also does cloud development, quality engineering, and ongoing support. It built Invesco's Basecamp platform for financial advisers. DataArt is a strong pick when a project means consolidating data, integrating several systems, or making an established financial platform more reliable.
Key Facts
- Core services: Custom software, legacy modernisation, data engineering and cloud development.
- Financial domains: Banking, asset management, capital markets, insurance and payments.
- Relevant project: Invesco Basecamp.
- UK presence: London office.
Contact Information
- Website: www.dataart.com
- E-mail: moc.traatad@selas-ku
- Facebook: www.facebook.com/dataart
- Twitter: x.com/DataArt
- LinkedIn: www.linkedin.com/company/dataart
- Address: 55 King William Street, London, EC4R 9AD, United Kingdom
- Phone: +44 (0) 20 7099 9464
9. Andersen
Andersen builds custom platforms for banks, fintech startups, neobanks, and other financial institutions. It offers product consulting, web and mobile apps, interface design, MVP development, and long-term maintenance. The company has a representative office in London and delivery teams in other countries.
Its fintech work includes payment processing, lending platforms, wealth management tools, and third-party integrations. Andersen also runs security testing and builds tools for compliance workflows. You can hire it for a new product, or add engineers to an existing program through dedicated teams and staff augmentation.
Key Facts
- Core services: Fintech development, UX/UI design, integrations, testing and maintenance.
- Financial domains: Banking, payments, lending and wealth management.
- Engagement options: Project delivery, dedicated teams and staff augmentation.
Contact Information
- Website: andersenlab.com
- E-mail: moc.balnesredna@tcatnoc
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
- LinkedIn: www.linkedin.com/company/andersen-softwaredev
- Instagram: www.instagram.com/andersen.global
- Address: 1 St Katharine's Way, 6th floor, London E1W 1YL, UK
- Phone: +44 207 048 6755
10. ELEKS
ELEKS builds financial applications for banks, asset managers, fund administrators, and trading businesses. It covers the investment lifecycle: portfolio operations, trading and post-trade workflows, reporting, and risk analysis. It also builds banking apps and payment platforms. A London office supports its international delivery team.
Its technical work extends to software re-engineering, cloud migration, data science, and quality assurance. ELEKS fits projects that need both a user app and heavy work on the systems behind it. Examples are data processing, transaction handling, or integration with existing software.
Key Facts
- Core services: Financial application development, re-engineering, cloud migration and QA.
- Financial domains: Banking, investment management, trading, cards and payments.
- Product types: Desktop, web and mobile software.
Contact Information
- Website: eleks.com
- Facebook: www.facebook.com/ELEKS.Software
- Twitter: x.com/ELEKSSoftware
- LinkedIn: www.linkedin.com/company/eleks
- Address: Moor Place, 1 Fore Street Avenue, London, UK, EC2Y 9DT
- Phone: +44-20-4583-0843
11. Softwire
Softwire helps financial services firms modernize software, improve data infrastructure, and turn AI prototypes into working systems. Its London team is part of a UK consultancy. Its services include digital product development, systems engineering, and customer experience design.
Its financial clients include Starling Bank, Railpen, and Tax Systems. Those projects cover digital banking delivery, pension data, and tax software. Softwire focuses on existing systems and data foundations. It helps organizations add new features while their established platforms and reporting keep running.
Key Facts
- Core services: Systems engineering, digital product development, data platforms and AI implementation.
- Project focus: Legacy modernisation and financial data infrastructure.
- Relevant clients: Starling Bank, Railpen and Tax Systems.
Contact Information
- Website: www.softwire.com
- E-mail: moc.eriwtfos@ofni
- Address: 315 Highgate Studios, 53-79 Highgate Road, London NW5 1TL
- Phone: +44 (0)20 7485 7500
12. Intellectsoft
Intellectsoft builds financial software for online banking, mobile financial apps, payments, and blockchain systems. It combines application engineering with product design, system integration, and dedicated development teams. The company has a London presence within its international operations.
For banks, it builds custom online platforms and mobile interfaces, and connects them to existing banking systems. Intellectsoft also builds AI-based financial tools and offers data and business intelligence services. It suits businesses that want one partner for customer-facing software and the application architecture behind it.
Key Facts
- Core services: Custom software, mobile development, system integration and dedicated teams.
- Financial domains: Online banking, payments and digital financial services.
- Additional capabilities: AI development, data analytics and product design.
- UK presence: London.
Contact Information
- Website: www.intellectsoft.net
- E-mail: ten.tfostcelletni@ofni
- Facebook: www.facebook.com/Intellectsoft
- Twitter: x.com/Intellectsoft
- LinkedIn: www.linkedin.com/company/intellectsoft
- Address: 500 Fashion Ave Fl 8A, New York City, NY 10018, USA
- Phone: +44 20 3887 0078
13. Computools
Computools builds digital banking platforms, payment systems, investment software, and financial risk management tools. Its London office is on St Bride Street. It also offers software engineering, modernization, data engineering, cloud migration, and dedicated development teams.
One of its projects is a banking platform integrated with Visa card processing. It includes transaction controls, spending limits, and parental approvals. That shows how Computools combines customer interfaces with payment infrastructure. It also builds financial analytics software for products where data processing is central.
Key Facts
- Core services: Financial software, system modernisation, data engineering and cloud migration.
- Financial domains: Banking, payments, investment and risk management.
- Relevant capability: Banking platform integration with Visa card processing.
Contact Information
- Website: computools.com
- E-mail: moc.slootupmoc@so
- Address: London, Second Floor Office, 10 St Bride Street, EC4A 4AD
- Phone: +48 516 280 275
14. 10Pearls
10Pearls offers custom fintech development, product design, software modernization, and quality assurance. In finance, it builds risk management systems, regulatory technology, and insurance software. The company has a London office in Paddington as part of its international operations.
It also works with AI and machine learning, including fraud detection, risk monitoring dashboards, and automated financial workflows. It modernized a finance and procurement platform, an example of its work on established enterprise software. Consider 10Pearls when a brief mixes app development with changes to architecture, testing, or delivery processes.
Key Facts
- Core services: Fintech development, product design, modernisation and QA.
- Financial specialisations: Risk management, regulatory technology and insurance software.
- Additional capabilities: AI, machine learning and workflow automation.
Contact Information
- Website: 10pearls.com
- E-mail: moc.slraep01@ofni
- Facebook: www.facebook.com/10Pearls
- Twitter: x.com/TenPearls
- LinkedIn: www.linkedin.com/company/10pearls
- Address: 2 Kingdom Street, Paddington, London, W26BD
- Phone: +44 7355 204066
15. Synechron
Synechron provides software engineering and consulting to financial services firms and has an office in London. It works in investment banking, capital markets, wealth management, retail banking, and payments. Its services include product engineering, legacy modernization, cloud delivery, and data integration.
The company also implements and upgrades established financial platforms, including Murex. That helps institutions that mix custom development with third-party trading or banking systems. Its teams also handle test automation and DevOps, so they support both implementation and the release process.
Key Facts
- Core services: Software engineering, systems integration, modernisation, cloud and DevOps.
- Financial domains: Banking, capital markets, wealth management and payments.
- Platform experience: Murex implementation, upgrades and testing.
- Geographic presence: London office within a global delivery network.
Contact Information
- Website: www.synechron.com
- LinkedIn: www.linkedin.com/company/synechron
- Instagram: www.instagram.com/synechroninc
- Address: Level 7, 95 Gresham Street, London - EC2V 7NA, United Kingdom
- Phone: +44 203 866 3888
Conclusion
London offers a broad choice of fintech software development companies, from specialist teams focused on financial products to large engineering consultancies serving banks and investment organisations. The companies on this list cover digital banking, payments, lending, trading, wealth management, financial data and legacy modernisation, with different combinations of local presence and international delivery.
The right provider depends on the project's technical scope, financial domain and delivery requirements. Businesses should compare relevant portfolio experience, integration capabilities, security and compliance expertise, team location, and ongoing support before selecting a development partner. This helps narrow the 15 companies to those best aligned with the product's architecture, development stage and long-term needs.