Custom Financial Software Development UK

Financial systems don’t leave much room for error. Whether you’re running a growing fintech product, building tools for internal finance teams, or updating legacy systems, getting the tech side right is non-negotiable. That’s where tailored software makes the difference.

In the UK, there’s a growing pool of specialists who don’t just code features – they understand FCA-regulated environments, PSD2, Open Banking APIs, and how real-time data flows through payments, lending, analytics, and everything in between. This page dives into the teams that build those systems, what they actually deliver, and how to spot the ones who’ll go beyond the brief.

1. LenGreo

Lengreo provides custom financial software development in the UK, working with fintech startups, SaaS providers, and regulated firms that need more than just off-the-shelf solutions. Our work connects strategy, development, and compliance under one roof. We’ve seen firsthand how fragmented software processes can slow things down, especially in finance, where timing and data accuracy matter. So instead of just shipping code, we partner up to get the right structure in place from the start.

In the UK market, we support financial platforms with tailored systems that align with FCA regulations, PSD2, and Open Banking needs. Whether it’s building out tools for payment processing, improving customer onboarding, or connecting backend finance ops with CRM or BI layers, we handle the moving parts without making things more complex than they need to be. Our delivery is structured around real collaboration – not handoffs – so we stay close from spec to scale.

Key Highlights:

UK-based delivery for fintech and financial service clients
Support across product design, development, and long-term maintenance
Hands-on integration with compliance, analytics, and CRM tools
Work models suited for growing fintech teams or legacy upgrades
Practical coordination across tech, marketing, and business goals

Services:

Custom financial software development
Mobile and web app development for fintech
Open Banking API integration
Secure onboarding and KYC flow implementation
Product strategy and business analysis
Website and platform development with compliance support

Contact Information:

Website: Lengreo
Email: hi@lengreo.com
Phone Number: +31 686 147 566
LinkedIn: Lengreo
Instagram: @lengreo
Twitter: @Lengreo

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2. Vention

Vention develops custom financial software for UK-based fintech firms, banks, and enterprises dealing with regulatory complexity or scale. Their local presence in London supports direct collaboration, while engineering capacity is drawn from global delivery hubs. Projects range from building new digital banking platforms to modernising back-office operations, with attention to both security and long-term maintainability.

They approach UK financial software development as a mix of high-trust engineering and operational partnership. Whether it’s helping a fintech scale payments infrastructure, supporting a wealth platform’s growth, or simplifying legacy system migration, the work stays tied to the client’s business model. Vention also offers options for dedicated pods, short-term builds, and long-haul delivery teams, depending on the client’s internal structure and pace of change.