FinanceFintech and Banking Software Development
Payments, lending, trading and banking platforms built for regulated markets, with the audit trails, access controls and decision explainability that examination requires.
TRUSTED BY TEAMS
Sodio builds fintech and banking software development across payments, lending, digital wallets, trading platforms, KYC and AML systems and core banking integration, plus financial AI for underwriting, fraud detection and risk. We have delivered in regulated markets:
Yeeld is an FCA-regulated UK consumer fintech where we built Open Banking aggregation across 17 institutions, an AI financial assistant, card issuing and an investment wrapper. Financial software carries a constraint most systems do not — every decision has to be reconstructable years later, by someone who was not there.
/// WHAT MAKES FINANCIAL SOFTWARE DIFFERENT
Every Decision Has to Be Reconstructable
The Core Constraint
Financial software is judged on something most systems never face: whether you can explain, years later, exactly why it did what it did.
Architecture, Not Documentation
That changes the architecture rather than the documentation. Decisions need audit trails at the point they are made, not logs reconstructed afterwards. A declined loan needs the features that drove it, retrievable on request. A flagged transaction needs the rule or score that flagged it. Systems designed to answer "what happened" after the fact rarely survive the first examination.
Regulatory Scope Containment
Regulatory scope is the second constraint, and it is cheaper to contain than to comply with. PCI DSS applies to any system that stores, processes or transmits cardholder data, and to anything that can affect the security of that environment. Tokenising through a compliant provider removes most of that burden before it exists. The same logic applies to data residency and to what developers can see in a non-production environment.
Integration Takes Longer Than Engineering
Integration is the third. Core banking platforms, payment rails and Open Banking providers all have their own approval processes, and an integration that looks like three weeks of engineering becomes three months once certification queues are involved. We establish what access genuinely exists during discovery rather than assuming it from an API reference.
Downtime Is Expensive
And downtime is expensive in a way that is easy to underestimate. A payment platform that fails mid-settlement creates a reconciliation problem, not just an outage.
/// FINANCE SOLUTIONS
Financial Software We Build
Fintech Software Development
Fintech App Development
Banking Software Development
Mobile Banking App Development
Lending Software Development
Payment Software Development
Payment Gateway Integration
Digital Wallet Development
Trading Platform Development
Prop Trading Platform Development
KYC & AML Systems
RegTech & Compliance Software
Core Banking Integration
///AI FOR FINANCIAL SERVICES
AI for Financial Services
AI in a regulated business has an extra requirement: the output has to be explainable to someone who was not in the room. Every model here is built with attribution and an audit trail, not just accuracy.
AI Loan Underwriting
Credit decisioning with feature-level explainability and a decision audit trail, because 'the model said no' is not an answer a regulator accepts.
Fraud Detection & AML AI
Transaction scoring tuned against your own confirmed fraud history, catching more without rejecting good customers.
Generative AI for Financial Services
LLM features for support, document handling and internal knowledge, with grounding, redaction and logging built in.
RPA in Banking
Rules-based automation for reconciliation, onboarding checks, reporting and exception handling across legacy systems.
AI Chatbots for Banking
Support grounded in real account data with scoped permissions and escalation, rather than a generic assistant on a help centre.
Credit Risk & Default Prediction
Risk scoring using transaction and alternative data, for thin-file borrowers a bureau score cannot assess.
Banking Data Analytics
Customer, transaction and portfolio analytics, plus the data engineering that makes any of it trustworthy.
Credit decisioning with feature-level explainability and a decision audit trail, because 'the model said no' is not an answer a regulator accepts.
Learn MoreTransaction scoring tuned against your own confirmed fraud history, catching more without rejecting good customers.
Learn MoreLLM features for support, document handling and internal knowledge, with grounding, redaction and logging built in.
Learn MoreRules-based automation for reconciliation, onboarding checks, reporting and exception handling across legacy systems.
Learn MoreSupport grounded in real account data with scoped permissions and escalation, rather than a generic assistant on a help centre.
Learn MoreRisk scoring using transaction and alternative data, for thin-file borrowers a bureau score cannot assess.
Learn MoreCustomer, transaction and portfolio analytics, plus the data engineering that makes any of it trustworthy.
Learn More///RELATED SOLUTIONS
Related Solutions
Specialised modules and adjacent financial systems built to standard enterprise specifications.
Insurance software, claims automation and underwriting
Learn MoreDeFi, tokenisation, smart contracts and Web3 settlement
Learn MoreIndependent security review for regulated applications
Learn More///STANDARDS AND INTEGRATIONS
Standards, Rails and Systems We Work With
/// HOW WE WORK
How We Work on Financial Projects
Discovery and regulatory mapping
We map the product, the data flows and the systems of record, then identify which regulatory regimes apply and where scope can be contained rather than complied with. Integration access is established here, not assumed.
Free solution architecture
Components, integrations, data boundaries, the compliance controls that apply, and a costed delivery plan that names the external approvals likely to affect the timeline. Yours to keep whether or not you build with us.
MVP in 30 days
A working MVP on the riskiest workflow first. Where licensing, core banking certification or security review apply, we say how much time they add before starting rather than after.
Production build in 90 days
Core build with testing, audit logging, monitoring and agreed integrations. Larger programmes are phased, because one release containing every regulated workflow is a risk nobody needs.
///FEATURED CASES
Future-Proof Software for Your Business
At Sodio, we deliver mobile apps, web apps, blockchain (DApps), AI integrations, SaaS platforms, and custom software development. Our innovative solutions are scalable, secure, and user-friendly, designed to drive growth and efficiency, keeping your business ahead in the competitive landscape. Trust Sodio for your digital transformation needs.
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/// /// FAQ
Frequently Asked Questions
Yes. Yeeld is an FCA-regulated consumer fintech in the UK where Sodio delivered the platform: Open Banking aggregation across 17 institutions, an AI financial assistant, smart accounts with a Visa card issued through Transact Payments Limited, and ISA, GIA and SIPP investment products integrated with WealthKernel. Nostro was a proprietary trading platform that ran for approximately three years before being acquired.
Mostly by keeping it out of scope. PCI DSS applies to any environment that stores, processes or transmits cardholder data, and to systems that can affect the security of that environment. Using a compliant payment provider and tokenising rather than storing card data removes most of the burden before it arrives. Where scope cannot be avoided, we design segmentation, logging and access controls around it and work with your QSA.
It can support them, and in most jurisdictions it cannot make them unaccountably. The requirement is explainability: which features drove the outcome, what the applicant can be told, and a decision audit trail a regulator can reconstruct. We build models with feature-level attribution and keep a human in the loop on declines.
Usually. Modern cores such as Mambu and Thought Machine expose proper APIs. Older platforms often mean an integration layer, event capture or scheduled file exchange instead of live calls. We establish what genuinely exists during discovery rather than reading it from documentation, because core integration is where financial projects overrun most often.
You own the IP. Assignment is written into the engagement, not negotiated afterwards. On data, we work to the principle that production data does not leave the environments you approve, and that developers work against anonymised or synthetic datasets wherever the work allows it.
For a defined scope we target a working MVP in 30 days and a core production build in 90. Finance extends that more often than most sectors: payment licensing, core banking integration approval, security review, penetration testing and regulatory sign-off all sit outside our control. We flag which apply during the free solution architecture so the timeline is honest from the start.
/// RELATED SERVICES
Related Services
Internal linking back into the main service tree.
/// GET STARTED
Start With the Regulatory Map
Tell us what you are building and which regimes apply. We will prepare a free solution architecture covering components, integrations, compliance scope and the external approvals likely to affect your timeline, so you can judge the approach before committing.