Engineering for
Fintech.
Fintech projects fail when the engineering and the compliance posture are sequenced wrong. SDEN engineers them together, and ships products that survive a regulator's review without slowing down the roadmap.
What we engineer
Fintech is the sector where engineering shortcuts get expensive fastest. A misjudged data model produces a reconciliation problem the operations team cannot unwind. A misjudged authentication boundary leaks customer money. A misjudged deployment story stops trades. The shortcuts that other sectors absorb as technical debt show up here as regulatory findings, customer escalations, and lost licenses.
SDEN's engineering posture is the one fintech teams need: typed end-to-end so the data model cannot drift silently, multi-tenant isolation at the type level so cross-tenant leaks are impossible by construction, audit logs that are tamper-evident and retained on the cadence regulators expect, and regional hosting (US, Canada, or EU) with a SOC 2 / CCPA / PIPEDA posture from day one. None of this is exotic. It is the bar, and most vendors do not meet it.
Payments, ledgers, KYC, reconciliation: engineered to be auditable
Fintech engineering at SDEN spans the surface most teams need: payment flows integrated against Stripe, Adyen, or local acquirers; double-entry ledgers that reconcile in real time and survive the operational events the schedule did not anticipate; KYC integrations against the providers regulators recognize (Onfido, Veriff, Sumsub); and the audit trail that proves every state change happened in the order the system claims.
The architectural defaults we apply on fintech engagements are explicit: PostgreSQL with row-level security for tenant isolation, encryption at rest with KMS-managed keys (customer-managed keys available where the threat model requires it), append-only audit logs exported to an isolated destination, MFA via WebAuthn for staff access, and the OWASP ASVS Level 2 bar as the engineering floor (Level 3 where the threat model demands it).
Audit-ready posture from launch, not as a remediation project
Fintech teams that ship with SDEN do not spend the year after launch retroactively remediating the security and compliance posture for an audit. The posture is in the architecture from day one, and the documentation a buyer's security review will ask for (DPA, sub-processor list, threat model, retention policy, incident response runbook) is in the repository, not on a roadmap.
What we will not pretend: we are not your compliance officer. The licenses, the regulatory filings, and the relationships with the supervisory authorities stay on your side. The engineering posture we ship is the substrate that lets you do that work without the engineering being the bottleneck.
The constraints specific to fintech
Per-tenant isolation enforced at the type level
Tenant ID is a required type, not an optional field. A query that forgets to scope is a compile error, not a runtime data leak.
Tamper-evident audit logs
Audit logs append to an isolated destination so a compromise of the application cannot retroactively rewrite the trail. Retained for at least 12 months, longer where the regulator requires it.
Regional hosting by default
Deploy in your region (US, Canada, or EU) on AWS, GCP, or Azure, chosen on the threat model, never silently changed.
Reversible by design
Every AI-assisted decision in the product has a non-AI fallback that the business can return to within minutes. Fintech regulators reward reversibility.
Domains a fintech engagement leans on
Every SDEN engagement spans multiple domains. These are the ones that ship most of the work in this vertical.
Software & mobile development
SDEN designs and ships production web platforms, SaaS applications, and native and cross-platform mobile apps, from a blank page to App Store, Play Store, and live production.
Cybersecurity
SDEN treats cybersecurity as an engineering discipline applied to every line of code, from threat modeling at the design stage to continuous monitoring once the product is live.
AI & machine learning
SDEN audits the AI integrations a business already runs, designs the custom workflows it should run next, and ships them to production with the evaluation harnesses that keep them honest: RAG, agents, classification, generation.
Cloud & infrastructure
SDEN designs, deploys, and operates cloud infrastructure on AWS, GCP, and Azure across US, Canadian, and EU regions, with cost discipline and Infrastructure as Code by default.
Fintech:
questions we get asked.
Direct answers to the questions we get asked the most. If yours isn't covered, write to the team.
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