Security in fintech software is not something that can be added once the product is almost ready. It affects architecture, integrations, access controls, data handling, testing, infrastructure, and even the way development teams release new features.
For fintech companies in the UK, that becomes especially important when software connects with payment providers, banking APIs, identity services, customer accounts, or other systems handling sensitive financial data. A secure development approach helps reduce technical risk without turning every product update into a long, complicated process. The companies in this article work with fintech and financial software where security, reliability, and controlled delivery are part of the development work from the start.
1. Itexus
At Itexus, we develop secure fintech software for companies operating in the UK, including banking platforms, payment systems, digital wallets, trading applications, and wealth management products. Security is handled as part of the development process rather than as a final check. That means we look at architecture, access controls, data handling, integrations, infrastructure, testing, and compliance requirements before they become expensive problems later. For products dealing with payments or sensitive financial data, we also work with encryption, multi-factor authentication, audit trails, role-based access, and controls aligned with requirements such as GDPR and PCI DSS.
A fair amount of risk in fintech sits outside the main application itself. Payment providers, Open Banking APIs, KYC and AML services, broker connections, market data feeds, and older banking systems can all create weak points if they are poorly integrated. Itexus works on these parts as well, including secure API design, credential handling, sandbox testing, monitoring, fallback logic, and vulnerability checks.
Key Highlights:
- Secure development for fintech companies serving the UK market
- Security controls built into architecture, integrations, testing, and deployment
- Experience with regulated banking, payments, trading, and investment software
- Support for KYC, AML, auditability, access control, and sensitive data protection
- Security testing includes vulnerability assessment and penetration testing
Services:
- Secure software development for fintech
- Banking and payment platform development
- Cybersecurity and compliance support
- Secure API and third-party integration development
- Quality assurance and security testing
- Legacy system modernization
- DevOps, cloud security, monitoring, and incident support
Contact Information:
- Website: itexus.com
- E-mail: [email protected]
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- LinkedIn: www.linkedin.com/company/itexus
- Instagram: www.instagram.com/itexus.soft
- Address: 8, The Green, STE road, Dover, DE 19901
2. Appinventiv
Appinventiv provides fintech software development services in the UK, covering custom financial applications, system integration, cybersecurity, and modernization of older platforms. Their security work is tied closely to the software itself rather than treated as a separate layer. They build products for areas such as digital payments, lending, investment management, compliance, financial reporting, and fraud detection, with machine learning and AI used where it fits the product.
Security requirements also shape how Appinventiv handles transactions, data, and integrations. Their fintech development work can include fraud monitoring, compliance management, secure payment processing, and controls for decentralized finance platforms. Legacy systems are part of the picture too, since older financial software often needs stronger security without forcing a complete rebuild.
Key Highlights:
- Cybersecurity included alongside application development and integration
- Experience with payments, lending, investment, compliance, and fraud detection
- Support for modernizing older financial systems
- AI and machine learning applied to fraud and risk-related functions
Services:
- Custom financial software development
- Fintech cybersecurity
- Fintech system integration
- Legacy financial system upgrades
- Fraud detection software
- Compliance management software
- Digital payment software development
Contact Information:
- Website: appinventiv.com
- E-mail: [email protected]
- Twitter: x.com/appinventiv
- LinkedIn: www.linkedin.com/company/appinventiv
- Instagram: www.instagram.com/appinventiv
- Address: 3rd Floor, 86-90 Paul Street, EC2A 4NE, London, UK
- Phone: +44-753-900-0641
3. Daffodil Software
Daffodil Software works with fintech companies in the UK on secure web and mobile applications, accounting systems, trading platforms, wealth management software, insurance tools, and payment processing systems. Their development process runs from product discovery through design, engineering, testing, deployment, and ongoing support.
Daffodil Software develops fintech products with requirements such as GDPR, PCI DSS, AML rules, payment regulations, and other UK financial frameworks in mind. They also handle application security, cloud services, software testing, and legacy modernization, which matters when a business is improving an existing platform rather than starting with a clean codebase. AI and automation can also be used for compliance checks, transaction processing, risk analysis, and other repetitive financial operations.
Key Highlights:
- Security and compliance considered across the development lifecycle
- Support for both new products and older fintech systems
- Familiarity with UK financial and data protection requirements
- AI and automation capabilities for financial operations
Services:
- Custom fintech application development
- Application security
- Software testing
- Legacy modernization
- Managed cloud services
- Payment and POS software development
Contact Information:
- Website: www.daffodilsw.com
- E-mail: [email protected]
- Facebook: www.facebook.com/daffodilsw
- Twitter: x.com/daffodilsw
- LinkedIn: www.linkedin.com/company/daffodil-software-ltd-
- Address: 124 City Road, EC1V 2NX, London, UK
- Phone: +1 518 676 2958
4. Andersen
Andersen develops financial software for banks, fintech companies, neobanks, lenders, investment businesses, and other financial organizations, with services available through their UK presence in London. Secure development is built around architecture, regulatory requirements, data protection, and testing from the beginning.
Andersen works with controls connected to GDPR, PSD2 and PSD3, AML and KYC requirements, and PCI DSS. They also cover cybersecurity, data governance, cloud infrastructure, support, and software architecture, rather than limiting security work to code review at the end. Financial software can also involve biometric authentication, secure transaction processing, audited smart contracts, and protected API connections, depending on the system being built.
Key Highlights:
- Fintech software services available in the UK
- Security and compliance addressed from architecture through release
- Work across banking, payments, lending, investment, wallets, and digital assets
- Support for GDPR, AML, KYC, PCI DSS, and payment regulation requirements
Services:
- Fintech security and compliance development
- Cybersecurity services
- Fintech software development
- Solution architecture
- Data governance
- Support and maintenance
Contact Information:
- Website: andersenlab.com
- E-mail: [email protected]
- Facebook: www.facebook.com/AndersenSoftwareDev
- Twitter: x.com/AndersenLabs
- LinkedIn: www.linkedin.com/company/andersen-lab
- Instagram: www.instagram.com/andersen.global
- Phone: +44 207 048 6755
- Address: 1 St Katharine’s Way, 6th floor, London E1W 1YL, UK
5. A-listware
A-listware provides software development, IT outsourcing, and cybersecurity services to businesses in the UK, with financial technology among the industries they support. Their fintech-related work covers banking, payments, lending, insurance, and investment software, while security can be handled through cybersecurity specialists, QA engineers, infrastructure teams, and secure cloud management. They also develop compliance and risk management systems, which matters for financial products where access, data handling, and operational controls cannot be separated from the application itself.
A-listware can modernize legacy applications, manage infrastructure, and support systems after release. Development moves through planning, architecture, UI and UX, implementation, testing, deployment, and maintenance. For fintech businesses that already have an internal engineering team, they can also add dedicated developers, DevOps engineers, cybersecurity experts, or QA specialists without taking over the whole development process.
Key Highlights:
- Experience across fintech, banking, payments, lending, insurance, and investment
- Cybersecurity specialists can work alongside development and infrastructure teams
- Support for compliance, risk management, and security-related business software
- Legacy modernization and ongoing application management are also covered
Services:
- Custom software development
- Cybersecurity services
- IT outsourcing
- Cloud application development
- Legacy software modernization
- Testing and QA
- Infrastructure services
Contact Information:
- Website: a-listware.com
- E-mail: [email protected]
- 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
6. AI Software Developers
AI Software Developers builds fintech systems for businesses in the UK, with a particular focus on secure digital finance products. They develop digital banking software, mobile wallets, peer-to-peer lending platforms, crypto exchanges, and RegTech tools.
Machine learning, AI, cloud infrastructure, data analytics, and blockchain form part of their fintech technology work. AI Software Developers can apply these tools to fraud detection, automated risk assessment, financial data analysis, and compliance processes, while blockchain is used where immutable records or smart contracts are required. Secure cloud deployment is another part of the service, giving them responsibility for infrastructure as well as the application layer.
Key Highlights:
- Focus on digital banking, wallets, lending, crypto, and RegTech
- Security and compliance considered during software design
- AI and machine learning used for fraud and risk-related functions
Services:
- Digital banking development
- Fintech software development
- Secure mobile wallet development
- Peer-to-peer lending software
- Crypto exchange development
Contact Information:
- Website: aisoftwaredevelopers.co.uk
- E-mail: [email protected]
- Facebook: www.facebook.com/Aisoftwaredevelopersuk
- Twitter: x.com/AISoftwareDevv
- Instagram: www.instagram.com/aisoftwaredevelopersuk
- Address: 62 Bush Street, Middlesbrough, TS56BW, United Kingdom
- Phone: (+44) 7526 914988
7. Lightflows
Lightflows is a fintech software development company. They create payment and digital wallet systems, investment and wealth management software, accounting applications, financial reporting tools, insurance software, and other custom financial products. Security is built into this work through risk assessment, secure architecture, encryption, tokenisation, logging, and compliance checks, rather than being left until the final testing stage.
Their development process connects security with several other disciplines. Lightflows uses an initial discovery phase to define requirements, then moves through design, development, testing, and deployment, with QA and DevOps running alongside the product work.
Key Highlights:
- Secure development practices include encryption, tokenisation, logging, and risk assessment
- ISO 27001 certified and Cyber Essentials Plus accredited
- Security, QA, DevOps, and regulatory checks are connected to the wider development process
- Support for blockchain and AI-based financial applications
Services:
- Custom fintech software development
- Security and regulatory compliance
- Fintech web and mobile application development
- Quality assurance and automated testing
- DevOps and CI/CD
- Payments and digital wallet development
Contact Information:
- Website: www.lightflows.co.uk
- E-mail: [email protected]
- Facebook: www.facebook.com/lightflowsdigital
- LinkedIn: www.linkedin.com/company/lightflows
- Instagram: www.instagram.com/lightflows
- Address: 1-2 Paris Garden , London SE1 8ND, United Kingdom
8. Vention
Vention offers financial software development services, working with banks, payment companies, lenders, wealth management firms, insurers, and other financial businesses. Their security work begins early in the development cycle, with compliance requirements, authentication, data protection, and system architecture considered before the product reaches deployment.
Older infrastructure is another area Vention handles, especially when a financial company needs to improve security without replacing an entire system at once. They can modernise legacy applications, move workloads to cloud environments, introduce safer integrations, and add monitoring or automated testing around existing services.
Key Highlights:
- Financial software development services for companies in the UK
- Cybersecurity built into architecture, integration, and deployment work
- Support for banking, payments, lending, insurance, and investment software
- Experience with authentication, secure APIs, and compliance tooling
- Legacy modernisation and cloud migration included in the broader security work
Services:
- Bespoke financial software development
- Cybersecurity
- Cloud development and migration
- Legacy system modernisation
- DevOps
- QA and security testing
Contact Information:
- Website: ventionteams.com
- E-mail: [email protected]
- Twitter: x.com/ventionteams
- LinkedIn: www.linkedin.com/company/ventionteams
- Instagram: www.instagram.com/ventionteams
- Address: 30 Churchill Place, E14 5RE, London
- Phone: +44 207 117 2842
9. Foundry 5
Foundry 5 is a software company focused on fintech products that have to meet financial, security, and compliance requirements from the start. They work with payment infrastructure, Open Banking, ledgers, digital assets, and other systems where reliability matters because failures can affect real transactions.
Their development process treats fraud controls, secure authentication, audit evidence, and financial risk as engineering requirements rather than tasks to add shortly before launch. Architecture choices and delivery decisions are recorded as the product is built, which can help with FCA reviews, SOC 2 work, and PCI-related audits. They also address problems such as unstable integrations, manual reconciliation, and legacy infrastructure, with attention to idempotency, safe failure, system uptime, and clean handover to internal engineering teams.
Key Highlights:
- Experience with Open Banking, payment rails, ledgers, and digital assets
- Audit documentation created alongside development
- Focus on stable systems and safe handling of financial transactions
Services:
- Web development
- Custom fintech software development
- Mobile application development
- Secure authentication implementation
- System modernisation
- UX and UI design
Contact Information:
- Website: foundry-5.com
- E-mail: [email protected]
- LinkedIn: www.linkedin.com/company/foundry-5
- Instagram: www.instagram.com/foundry.5
- Address: 5 St. John’s Lane, London, EC1M 4BH
- Phone: 0203 1938 835
10. Ficode
Ficode develops fintech software from its UK base in Birmingham, with work covering financial applications, API integrations, cloud systems, blockchain, AI, and data management. Their development model breaks delivery into planning, design, development, testing, and release stages, which gives security and regulatory checks a place throughout the process rather than leaving them until the end.
Their technical range is fairly broad, which is useful when security depends on more than one part of the system. Ficode can combine mobile or web development with backend services, databases, cloud infrastructure, and blockchain components, while API integration connects financial software with external services. Testing is part of each development cycle, and their work can also involve AI-based forecasting, automation, and data analysis where financial businesses need more structured handling of operational or risk-related information.
Key Highlights:
- UK-registered software company with a Birmingham office
- Fintech development built around staged planning, testing, and deployment
- Attention to regulatory compliance and protection of financial data
- Support for cloud, blockchain, AI, and API-based financial systems
Services:
- Fintech software development
- API integration
- Cloud computing
- AI development
- Data management
- Blockchain integration
Contact Information:
- Website: www.ficode.com
- E-mail: [email protected]
- Facebook: www.facebook.com/FicodeTechnologies
- Twitter: x.com/ficodetech
- LinkedIn: www.linkedin.com/company/ficode-technologies-limited
- Instagram: www.instagram.com/ficodetechnologieslimited
- Address: Regus Business Centre, Fort Dunlop Fort Pkwy, Birmingham, B24 9FD, U.K.
- Phone: +44 800 102 6860
11. Softomate Solutions
Softomate Solutions develops fintech software for banks, investment firms, insurers, credit unions, and other regulated financial businesses. Their security approach starts with the system architecture and covers areas such as encrypted data storage, OAuth-based authentication, access control, audit trails, and secure API connections. They also build compliance functions into the software itself, including KYC and AML checks, transaction monitoring, FCA reporting workflows, and UK GDPR data handling.
Connecting older financial systems with newer services is another part of Softomate Solutions’ work. They build Open Banking and PSD2 integrations, connect platforms such as CRM and accounting systems, and use middleware when direct APIs are not available. AI is used for fraud detection, credit risk assessment, transaction screening, and regulatory document processing, while compliance teams still keep control over higher-risk decisions.
Key Highlights:
- FCA, UK GDPR, AML, KYC, and PSD2 requirements built into software workflows
- Encryption, secure authentication, audit trails, and access controls
- Open Banking and financial platform integration
- AI-based fraud detection and risk scoring
- Support for legacy financial systems
Services:
- FCA compliance automation
- Bespoke fintech software development
- AML and KYC workflow development
- Open Banking API integration
- AI fraud detection
- Financial system integration
Contact Information:
- Website: www.softomatesolutions.com
- E-mail: [email protected]
- Facebook: www.facebook.com/softomatesolutions
- Instagram: www.instagram.com/softomate
- Address: 17 Albemarle Park, Stanmore, London, HA7 4HL
- Phone: 07442 569900
12. WEBBYLAB
WEBBYLAB offers financial software for banks, payment providers, neobanks, digital wallet companies, processing businesses, and other fintech organisations, with services available in the UK through its London office. Their work covers systems that process transactions and sensitive customer data, including payment gateways, issuing software, money transfer applications, banking infrastructure, and back-office tools. Complex integrations are a central part of WEBBYLAB’s fintech engineering. They can connect software directly with payment schemes, processing centres, Banking-as-a-Service providers, and other third-party systems, while middleware is used to organise data exchange between platforms that were not originally designed to work together.
Key Highlights:
- Experience with payment processing, banking, wallets, and financial infrastructure
- Secure integrations with payment and banking systems
- KYC and fraud prevention built into financial applications
- Support for financial companies working under regulatory requirements
Services:
- Payment gateway development
- Mobile banking software
- Digital wallet and money transfer development
- Fraud prevention and KYC software
- Middleware development
Contact Information:
- Website: webbylab.com
- Facebook: www.facebook.com/webbylab
- LinkedIn: www.linkedin.com/company/webbylab
- Instagram: www.instagram.com/webbylab
- Address: 50 Essex Street, WC2R 3JF London, United Kingdom
13. Blackthorn Vision
Blackthorn Vision works with fintech businesses in the UK as part of its wider software development activity across Europe and the US. Their financial software work combines product development with cloud engineering and data-heavy applications, which puts security across several parts of the system rather than only in the user-facing application. For financial teams dealing with sensitive information, that can include protected infrastructure, controlled data processing, and reliable backend services.
Cloud migration is also part of Blackthorn Vision’s fintech capabilities. Moving an older financial application into a newer environment can create security and access-control issues if the underlying architecture is not handled carefully, so their work extends into infrastructure and system modernisation. They also provide analytics-focused engineering for financial products that depend on large amounts of operational or transactional data.
Key Highlights:
- End-to-end financial product development
- Cloud migration and infrastructure work
- Experience with data-intensive financial applications
Services:
- Custom fintech software development
- Cloud migration
- Software modernisation
- Data analytics development
- Backend development
- Software engineering support
Contact Information:
- Website: blackthorn-vision.com
- E-mail: [email protected]
- Facebook: www.facebook.com/blackthornvision
- LinkedIn: www.linkedin.com/company/blackthorn-vision
- Instagram: www.instagram.com/blackthorn_vision
- Address: Twarda 18, 00-831 Warszawa, Poland
14. DeepInspire
DeepInspire builds fintech software for companies across digital banking, payments, trading, lending, investment management, personal finance, and Banking-as-a-Service. Their security work covers secure authorisation, encryption, biometric controls, KYC, KYB, AML, and GDPR requirements. They also deal with payment connections such as SWIFT, SEPA, BACS, and FPS, where the security of integrations and transaction flows is just as important as the application interface.
DeepInspire handles backend architecture, cloud infrastructure, custom APIs, analytics, and third-party integrations alongside the main application. Trading and exchange software is built around stability, scalability, and protected data handling, while payment and wallet systems include controls for financial transactions and personal information.
Key Highlights:
- Fintech development services for UK financial companies
- KYC, KYB, AML, GDPR, encryption, and biometric security
- Support for major UK and international payment systems
- Secure API and third-party financial integrations
- Cloud, blockchain, and AI capabilities
Services:
- Digital banking software development
- Trading and exchange platform development
- Payment and digital wallet development
- Compliance and security development
- KYC and KYB solutions
- Cloud and DevOps
Contact Information:
- Website: deepinspire.com
- E-mail: [email protected]
- Facebook: www.facebook.com/deepinspire
- Twitter: x.com/DeepInspireCom
- LinkedIn: www.linkedin.com/company/deepinspire
- Instagram: www.instagram.com/deepinspire_com
- Address: 71-75 Shelton Street, Covent Garden, London WC2H 9JQ, UK
- Phone: +44 20 4577 1162
Conclusion
Secure software development for fintech companies in the UK comes down to much more than protecting code. Financial products depend on safe data handling, reliable integrations, controlled access, regular testing, and systems that can meet regulatory requirements without slowing every release to a crawl.
The companies in this article approach that work in different ways. Some focus heavily on banking and payment infrastructure, while others combine fintech development with cloud security, AI, compliance automation, legacy modernisation, or fraud prevention. The right fit depends on what needs protecting, what already exists, and how complex the financial environment is. In fintech, security is rarely one feature. It is usually the thread running through the whole product.