Fintech Software Development — Payments, Banking and Trading Systems
Fintech is the domain where the regulation is now as demanding as the engineering. A payments or banking system today has to prove operational resilience, evidence its third-party dependencies, report incidents on a clock and survive supervisory scrutiny. We build the software and the evidence layer together, because retrofitting the second one onto the first is where most fintech budgets go to die.
Our work in this sector began with trading bots for foreign exchange, moved through blockchain and cryptocurrency investment and trading platforms, and now centres on banking services and payment systems.
What we build
- Payment systems — initiation, routing, reconciliation and settlement, including instant payment flows and the reporting they oblige.
- Banking and account services — ledgers, onboarding, KYC workflows and account aggregation against open banking APIs.
- Trading and investment platforms — order handling, market data ingestion and the low-latency paths that actually matter, separated from the paths that do not.
- Digital asset systems — custody integrations, exchange connectivity and the controls a licensed operator has to demonstrate.
- Risk and back office — limits, fraud signals, dispute handling and the reporting that regulators and auditors ask for.
The compliance surface has changed
Several regimes now land on the same systems at once, and they are engineering requirements rather than paperwork:
- Operational resilience — the Digital Operational Resilience Act has applied since January 2025, and supervisory attention has since moved from readiness assessments to how ICT risk is actually managed: third-party dependency mapping, incident response and tested recovery under real operating conditions.
- Instant payments — availability and adoption now carry periodic reporting obligations for payment service providers in the euro area, which means the data has to be captured by the system rather than assembled by hand each period.
- Payment services reform — PSD3 and the accompanying Payment Services Regulation reached political agreement in late 2025 and carry a multi-year implementation period, so the sensible posture now is building for stronger authentication, fraud-data sharing and API quality rather than waiting for the final text.
- Digital assets — firms operating in crypto-asset services face a defined licensing path under MiCA, with transitional arrangements closing during 2026.
- AI in credit and pricing — credit scoring and insurance pricing sit inside the EU AI Act's high-risk categories, whose obligations became enforceable on 2 August 2026.
How we engineer for audit
Regulated systems are distinguished less by their features than by their ability to answer questions afterwards. We build immutable audit trails, deterministic reconciliation, idempotent payment operations that survive retries without double-spending, and structured logging designed for the report a supervisor will eventually ask for. Third-party dependencies are inventoried and monitored, because under current resilience rules an outage at a provider is your incident to explain.
Where we would push back
Not every financial product needs a bespoke core. Licensed banking-as-a-service providers, payment orchestrators and card issuing platforms now cover a great deal of ground, and building those layers yourself adds regulatory burden without adding differentiation. We would rather integrate the commodity parts and spend the budget where your product is actually distinct. Similarly, distributed ledgers earn their place where multiple parties genuinely lack trust in a common record, and rarely otherwise.
Our fintech expertise
- Payments and settlement
- Core banking integration
- Trading and market data
- Operational resilience
- Audit trails and reporting
- Distributed ledger systems
Frequently asked questions
Do we need to build our own payment infrastructure?
Usually not all of it. Licensed banking-as-a-service providers, payment orchestrators and issuing platforms now cover a great deal of the commodity layer, and rebuilding it yourself adds regulatory obligations without adding differentiation. We normally integrate those parts and concentrate the budget on whatever makes your product distinct.
How does operational resilience regulation affect the build?
It turns things that were once operational habits into engineering requirements. Third-party dependencies have to be inventoried and monitored, incidents have to be detected and reported on a defined clock, and recovery has to be tested rather than assumed. Building that instrumentation alongside the system is considerably cheaper than reconstructing it under supervisory pressure.
Can you work with our existing core banking system?
Yes, and this is the more common engagement. We build around existing cores and ledgers through their APIs or file interfaces rather than proposing to replace them, since replacement projects in this sector carry risk out of proportion to most of the benefits claimed for them.
Is blockchain the right choice for our product?
Sometimes, but far less often than it is proposed. A distributed ledger earns its place where several parties genuinely do not trust a shared record and no neutral operator exists. Where one organisation controls the data, a conventional database with proper audit trails is faster, cheaper and easier to operate. We will say which case you are in before any build starts.
Does the EU AI Act apply to financial products?
It can. Credit scoring and insurance pricing fall within the Act's Annex III high-risk categories, whose obligations became enforceable on 2 August 2026, so a model used to make or materially influence those decisions carries documentation, logging, oversight and robustness requirements. Whether your specific system is in scope is a determination for your counsel, and we build the technical evidence those obligations depend on.
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