Fintech software development
Fintech software development company
for teams that run regulated money.
TrustChange is an EU-based fintech software development company for licensed VASPs, PSPs, EMIs, neobanks and banks. We deliver custom fintech software development end to end — architecture, build, integration, hardening and run — with MiCA, PSD2, AML/Travel Rule and GDPR engineered into every layer, not bolted on before audit.
- EU-based engineers
- MiCA and PSD2-aware design
- GDPR-compliant delivery
- Client-owned code
Scope
What we build for fintech
Our fintech custom software development covers the six systems that have to agree with each other every second of the day. Product, compliance and procurement leads see the same scope: one team, one plan, one line of accountability.
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01
Ledger core
A double-entry ledger is the single source of truth. Every balance can be rebuilt from its entries.
- Double-entry postings
- Idempotent writes
- Daily reconciliation
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02
Accounts & limits
Accounts, sub-accounts and holds in one model. Limits are rules, not code branches.
- Holds and releases
- Tiered limits
- Fee schedules
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03
Payment rails
SEPA, card and crypto rails behind one internal contract. Adding a rail stays a config job.
- SEPA and SEPA Instant
- Card acquiring links
- On-chain transfers
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04
Identity & risk
One onboarding flow feeds every product. Vendor swaps stay cheap because the flow is yours.
- KYC and KYB
- Sanctions screening
- Case review queue
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05
Data & reporting
An event log feeds the warehouse. Finance, risk and the regulator read the same numbers.
- Event sourcing
- Warehouse models
- Regulatory extracts
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06
Platform operations
You cannot run money you cannot see. Metrics, alerts and audit trails ship on day one.
- Service dashboards
- Immutable audit log
- 24/7 on-call runbooks
Architecture
Reference architecture for fintech
Software development for fintech has to survive vendor swaps, rule changes and a five-year roadmap. We keep the ledger free of vendor logic, so a new bank, acquirer or chain is an adapter, not a rebuild.
Card and bank rail work is detailed on our payment gateway engineering service. Key handling and custody sit with our wallet and custody engineers. Fiat-to-crypto flows live on on- and off-ramp integration, and matching-venue work on crypto exchange development.
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Experience
Web and mobile clients, plus the back-office console your team works in.
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Product services
Payments, wallets, cards and treasury logic. Each service owns its own data.
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Platform core
Ledger, accounts, limits and the event log. This layer never depends on a vendor.
- 04
Rails & vendors
Banks, acquirers, custodians and chains sit behind adapters we own.
- 05
Controls & evidence
AML rules, retention, access control and audit trails cut across every layer.
Interfaces
Controls, evidence and audit interfaces
Every fintech solutions software development company earns its keep at audit time. Each audience — engineering, back office, finance, oversight — gets a named surface. Nobody queries the database directly.
| Surface | Shape | Guarantee |
|---|---|---|
| Public API | REST + webhooks | Versioned, signed, replay-safe |
| Streaming | WebSocket | Balances and payment status |
| Internal bus | Event log | Ordered, replayable, audited |
| Back office | Admin console | Roles, approvals, four-eyes |
| Finance | Batch extract | Daily ledger and fee files |
| Oversight | Report pack | Evidence for your auditor |
Delivery
End-to-end fintech development services
Our end to end fintech development services run from discovery through 24/7 operation. Hardening is a phase, not a hope: we test failure, access reviews and evidence packs before launch, not after regulators ask.
- 01
Discovery
2–4 weeks
Target architecture, rail list, control map and a costed delivery plan.
- 02
Core build
Iterative
Ledger, accounts and the event log built behind a hardened API.
- 03
Rail integration
In parallel
Banks, acquirers and chains wired in through adapters you own.
- 04
Hardening
Before launch
Load tests, failure drills, access review and an evidence pack.
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Run
Ongoing
24/7 cover with named engineers. Roadmap work continues beside it.
Engagement
Engagement models for fintech software development
Procurement gets four commercial shapes for the same engineering bench. Scope shifts as you learn — the contract should shift with it, without switching fintech software development agency mid-programme.
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Fixed-scope build
A defined core, a fixed price, a dated plan. Best when the scope is settled.
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Dedicated team
A standing squad with a lead. Best for long roadmaps and steady releases.
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Staff augmentation
Senior engineers inside your team. Best when you own the plan already.
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CTO advisory
Architecture and hiring guidance. Best before you commit to a build.
Questions
Fintech software development FAQs
The questions technical, product, compliance and procurement leads bring to the first call. Bring the rest to the discovery session.
Rule mapping is detailed on our compliance engineering page. Delivery patterns and evidence live on how we deliver. Related specialised builds: fintech app development company, fintech product development company, banking software development company, AI fintech software development, open banking API integration, fintech software development outsourcing, fintech mobile app development company, fintech web development company, financial software development company and financial services software development.
What kind of fintech software development company is TrustChange?
We are an EU-based engineering partner, not a packaged SaaS or a legal-advice firm. Our engineers build custom fintech software for licensed VASPs, PSPs, EMIs, neobanks and banks, and we hand the code, the cloud accounts and the runbooks to your team.
Do we have to replace our current core to work with a fintech development company?
Rarely. Most software development for fintech we do sits beside an existing core: a thin ledger, an event log and a hardened API in front. Traffic moves across in stages, so a live product keeps running while the new platform proves itself.
How do you handle MiCA, PSD2, AML/Travel Rule and GDPR during the build?
Compliance runs beside the code, not after it. Our compliance engineering practice maps each obligation to a control, a log line and an evidence artefact, and each release ships with the audit trail already assembled.
Which engagement models do you offer for fintech custom software development?
Four. A fixed-scope build for settled scope, a dedicated team for long roadmaps, staff augmentation when you own the plan, and CTO advisory before a build is committed. The same engineering bench sits behind all four contracts.
Who owns the code and the intellectual property?
You do. TrustChange delivers bespoke, client-owned fintech software development solutions. There is no white-label lock-in, no per-seat licence and no hidden vendor tax after go-live — the repositories, the pipelines and the cloud accounts stay with you.
How quickly can you start on a new fintech programme?
A discovery engagement usually starts within two to four weeks of a signed statement of work. That phase returns a target architecture, a rail and vendor list, a control map and a costed delivery plan you can take to your board.
Book a discovery call with our fintech engineers
Bring a rough scope, your target licences and a rail list. TrustChange comes back with an architecture view, a control map, a risk list and a costed plan for your fintech solutions development company shortlist. No demo theatre, no boilerplate deck.