Money math has to be exact
Rounding, currency handling, and reconciliation are unforgiving, and a ledger that drifts erodes trust with users and partners. We build transaction systems with ledger integrity designed in, not patched on.
002Fintech Software Development
Fintech software development with compliance built into the architecture
Webisoft builds fintech products that move real money without incident: payment systems, digital banking platforms, trading tools, and the compliance workflows around them.
Our senior Montreal engineers design for PCI DSS and SOC 2 environments from the first commit: ledger integrity, audit trails, and access controls as architecture, not afterthoughts.
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When to bring us in
Signs your fintech product needs a senior engineering team
Financial software punishes shortcuts harder than any other category: money math has to be exact, regulators expect evidence, and every integration is a dependency you answer for. Here are the situations where an engagement with us pays for itself:
A compliance audit is on the calendar
PCI DSS assessments and SOC 2 audits want evidence in the systems themselves: access controls, encryption, and logs that reconstruct events. Software built for audit passes it; software patched for audit fights it.
Transaction volume is outgrowing the stack
What worked at launch strains as volume grows: queues back up, reconciliation windows stretch, and incidents multiply. We re-architect for the volume you are heading toward, without pausing the business.
Banking and payment integrations multiply
Processors, banking partners, KYC vendors, and data providers each bring their own API, sandbox, and failure modes. We build an integration layer that keeps each one replaceable instead of load-bearing.
Fraud and risk checks are manual
Reviews queue up, rules live in analysts' heads, and growth multiplies the backlog. We build risk workflows that automate the clear cases and route the ambiguous ones to humans with full context.
A prototype needs to become a product
The demo that raised the round was built for speed, not for money movement at scale. We harden it, or scope the rebuild honestly, the same way our MVP development work plans for what comes after launch.
What we build
Payments, digital banking, and trading platforms: fintech software development by Webisoft
We build financial software with the discipline that moving other people's money demands: exact accounting, defense in depth, and audit trails on every state change. Every build is scoped around your product, your partners, and the regulations that apply to them.
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Payment systems
Processing flows, wallets, payouts, and reconciliation built on idempotent operations and double-entry accounting, so every cent is accounted for on both sides.
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Digital banking platforms
Onboarding, accounts, cards, and transfers built on your banking partners' rails, with the controls and reporting those partnerships require.
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Trading and investment platforms
Order flows, portfolio views, and market data integration engineered for correctness under concurrency, where a race condition is a financial event.
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Lending and credit workflows
Origination, underwriting workflow, and servicing tools that keep every decision documented and every balance reconstructable.
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KYC, AML, and compliance tooling
Identity verification integrations, transaction monitoring, and regulatory reporting workflows that make compliance an operating capability rather than a quarterly scramble.
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Fintech data and AI
Analytics, risk scoring workflows, and automation built with the same controls as the core product. Our AI development services bring intelligent systems into regulated environments responsibly.
The Webisoft advantage
What our fintech software engagements include
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Compliance-grade architecture
PCI DSS scoping, SOC 2 control alignment, encryption in transit and at rest, and least-privilege access are architectural decisions made at the start, because bolting them on later means rebuilding under audit pressure.
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Ledger integrity by design
Double-entry patterns, idempotent money movement, and reconciliation jobs are built into the core, so the books balance by construction rather than by monthly heroics.
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Audit trails on every state change
Every balance change, permission grant, and configuration edit is logged and reconstructable, which is what regulators, partners, and your own incident reviews will ask for.
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Written, executable deliverables
Architecture decisions, integration contracts, and control mappings are documented so your compliance team, your partners, and any future engineers can verify how the system works.
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Diligence-ready engineering
We build to the standard investors and acquirers check for, the same standard our technical due diligence practice applies when assessing other teams' fintech codebases.
Our process
How a fintech software project runs
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Scoping and regulatory mapping
1We define the product, the money flows, the partners involved, and which standards and regulations apply to each part, so compliance scope is known before design starts.
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Architecture and integration design
2Ledger design, integration contracts with processors and banking partners, and the security architecture are written down with trade-offs stated, and reviewed before the build.
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Incremental delivery behind controls
3Features ship to staging and then production behind flags and limits, so new money movement paths prove themselves on small volume before they carry real load.
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Testing, reconciliation, and security review
4Money paths get automated tests as a rule, reconciliation runs against partner records, and security review covers every path that touches funds or credentials.
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Launch and monitoring
5Go-live comes with monitoring on the metrics that matter in fintech: settlement status, reconciliation breaks, latency, and error rates, with runbooks for the failures worth planning for.
Why Webisoft
Why choose Webisoft for fintech software development?
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Builders who respect money math
Financial correctness is an engineering discipline: exact arithmetic, idempotency, and reconciliation are treated as core requirements, not edge cases to fix after launch.
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Senior people on your problem
The engineers who scope your engagement are the engineers who do the work. No bait and switch between the pitch team and the delivery team.
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North American, in your timezone
We work from Montreal, in your business hours, under Canadian contract and privacy law. When a settlement question comes up, it gets answered the same day.
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Integration depth with financial partners
Processors, banking APIs, KYC vendors, and market data feeds each have their own quirks. We verify sandbox access and partner requirements early, before they can surprise the schedule.
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Honest about scope and risk
Some features should wait until the compliance footing exists, and some builds should start smaller than planned. We say so, because in fintech the expensive mistakes are the ones nobody flagged.
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Leadership on tap afterwards
When the project surfaces a need for ongoing technical leadership, our fractional CTO service continues the work with the same people and full context.
FAQ
Frequently asked questions
(6)- Typical scope covers payment and money movement systems, digital banking and trading platforms, lending workflows, and the compliance tooling around them: KYC and AML integrations, transaction monitoring, and reporting. It also includes the engineering substrate fintech depends on, such as ledger design, reconciliation, and audit logging.
- It depends on what the product touches. PCI DSS applies when cardholder data is stored, processed, or transmitted. SOC 2 is the attestation enterprise partners commonly ask for. KYC and AML obligations come from the financial regulations of each operating jurisdiction, usually flowing through banking and processing partners. Mapping the applicable set is a standard first step of a build.
- Through layers rather than a single control: encryption in transit and at rest, least-privilege access, secrets management, dependency scanning, and explicit security review on every path that touches funds or credentials. Logging and alerting are part of the security design, because detecting and reconstructing an incident matters as much as preventing one.
- Yes, that is the normal shape of a fintech build: the product sits on rails provided by processors, banking-as-a-service platforms, and data providers, connected through their APIs. The engineering questions are about reliability and replaceability, handling partner downtime gracefully and keeping any single vendor swappable, which is why the integration layer deserves as much design as the product itself.
- Most products start on a banking-as-a-service or processor platform because it compresses time to market and inherits much of the compliance burden. Going direct to bank partnerships makes sense later, when volume, unit economics, or product needs outgrow the platform. A well-architected system keeps that migration possible by isolating partner-specific code behind interfaces.
- A focused first release typically ships in months, with the schedule driven by partner onboarding, compliance review, and integration testing more than by feature development. Partner timelines are the least controllable part, so starting those applications early is standard practice. A scoping phase produces a concrete estimate for the specific product and partners involved.
