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Your Fintech MVP Just Failed Its First Security Audit

If you're a fintech founder racing to launch before runway ends, compliance isn't optional -- it's the only gate between you and real transactions.

We build fintech web applications on Next.js with Stripe Connect and Plaid integrations that are architected for PCI DSS compliance from day one, not retrofitted after a failed audit. Founders get a production-ready MVP that clears security reviews, keeps KYC drop-off below industry average, and handles real transaction volume without re-platforming at Series A.

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Fintech Web Development

Fintech web development means building payment, lending, or banking-adjacent products where regulatory compliance, data security, and financial API integrations are first-class engineering concerns, not afterthoughts. This covers Stripe Connect marketplace flows, Plaid-linked bank verification, KYC/AML onboarding pipelines, and the server-side architecture required to pass PCI DSS and SOC 2 audits. The output is a shippable product that satisfies both end users and the compliance reviewers standing between you and live transactions.

What is holding your current website back?

Common gaps we find in nearly every audit.

Your MVP passed internal QA but failed the first third-party security audit, pushing your launch date by months and burning runway you cannot replace.
Risk: Every week of delay is a week competitors onboard the customers you intended to capture, and re-architecting for compliance after the fact costs two to three times what building it correctly upfront would have.
Your KYC onboarding flow is losing 35-45 percent of users before identity verification completes, making your unit economics impossible to defend to investors.
Risk: High drop-off at KYC is not a UX problem you can A/B test away -- it signals that the underlying verification flow, error handling, and retry logic were designed without real user data, and patching it piecemeal compounds technical debt.
Your Stripe or Plaid integration works in staging but produces reconciliation errors and webhook failures under real transaction volume, and your team does not have the financial-domain expertise to diagnose why.
Risk: Unreconciled transactions create regulatory exposure, trigger chargebacks, and erode user trust in ways that are disproportionately damaging for a fintech product where trust is the core product value.

How We Build This Right

Every safeguard, built in from Day 1.

PCI DSS Scope Reduction

We structure card-present and card-not-present flows so that raw cardholder data never touches your servers, using Stripe Elements and server-side tokenization to minimize your PCI DSS scope to SAQ A, the lowest audit burden available to software companies.

KYC/AML Pipeline Architecture

Identity verification is implemented with documented decision logic, adverse-action handling, and audit-trail storage that satisfies FinCEN Customer Identification Program requirements and holds up under BSA examination.

Data Residency and Encryption Controls

Sensitive financial and personal data is encrypted at rest and in transit with key management patterns compatible with SOC 2 Type II evidence collection, so your security review produces findings you can close, not architectural recommendations you cannot action without a rewrite.

What We Build

Purpose-built features for your industry.

Stripe Connect Marketplace Integration

We implement both Standard and Express Connect account flows, including onboarding, payout scheduling, platform fee logic, and dispute handling, with webhook idempotency and reconciliation logging built into the data layer from the start.

Plaid Link and Bank Verification

Bank account linking, balance checks, and transaction history pulls are built with Plaid's Link token flow, error-state handling for all institution failure modes, and fallback micro-deposit verification for institutions outside Plaid's coverage.

Sub-400ms Server-Side Rendering

Financial dashboards and account views are rendered server-side with Next.js App Router, using edge caching strategies and selective client hydration so authenticated pages load fast without exposing session data to CDN layers inappropriately.

Optimized KYC Onboarding Flow

Identity verification steps are sequenced based on conversion data from comparable fintech products, with inline error recovery, document retry logic, and mobile-optimized capture that consistently reduces drop-off compared to default provider SDK implementations.

Our Development Process

From discovery to launch. Quality at every step.

01

Compliance and Architecture Scoping

1 week

We map your intended product against applicable regulatory requirements, identify which Stripe and Plaid integration patterns reduce your audit surface, and produce a written architecture decision record before a line of application code is written.

02

Core Infrastructure and Auth Build

2 weeks

Next.js application scaffold, database schema, session management, and role-based access controls are built and reviewed against your target compliance framework so the foundation does not need to be revisited when audit time arrives.

03

Financial Integration and Onboarding Development

4-6 weeks

Stripe Connect flows, Plaid bank linking, KYC pipeline, and transaction logic are built in parallel workstreams with integration tests that cover failure modes, not just happy paths, and reconciliation logging enabled from the first deployment.

04

Audit Preparation and Handoff

1-2 weeks

We produce the documentation package your security auditor will request -- data flow diagrams, encryption key management documentation, access control matrices, and vendor responsibility summaries -- and walk your team through the codebase before engagement ends.

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Frequently Asked Questions

Most fintech MVPs land between $40K and $80K. That gets you Stripe Connect with connected account onboarding, Plaid Link for bank connections, a KYC verification flow, a user dashboard with transaction history, and an admin panel. The number moves based on how many payment methods you support, whether you need multi-currency, and how complex your KYC rules are. We scope everything in a paid discovery week before quoting a fixed price.
An MVP with payments, bank linking, and KYC takes 6-8 weeks. A full platform with multi-party payouts, compliance reporting, and role-based admin panels runs 10-12 weeks. We've done it faster when the regulatory requirements are already documented -- the compliance mapping is usually what slows things down, not the code.
Financial dashboards need to render large datasets fast. Next.js server components let us fetch and render transaction tables on the server, so users see data in under 400ms instead of waiting for a client-side hydration cycle. Server-side rendering also means better SEO for your marketing pages and a single codebase for both. If you need a native mobile app, we'll build the API layer in Next.js route handlers and pair it with a React Native client.
We don't store card data -- ever. Stripe Elements and Stripe.js tokenize payment details in the browser before they touch your server, which keeps you at PCI SAQ-A -- the simplest compliance tier. We document the data flow, configure Content Security Policy headers, and prepare the evidence your QSA or banking partner needs. If your product requires SAQ-D level compliance, we'll tell you upfront and scope accordingly.
We've shipped production flows with Persona, Alloy, Jumio, and Onfido. Persona is our default recommendation for most US-focused products because their API is clean and their document verification accuracy is strong. For products that need adverse media screening, PEP checks, or custom risk scoring rules, we wire in Alloy as an orchestration layer. You'll get a branded verification flow inside your Next.js app, not a redirect to a third-party domain.
A typical project runs with a tech lead, one or two senior full-stack engineers, and a QA engineer -- all on our payroll, not subcontracted. The tech lead handles architecture decisions and compliance mapping. Engineers build in two-week sprints with demo calls every Friday. You'll have a shared Slack channel and direct access to the people writing the code, not a project manager relaying messages.
Every fintech project includes 30 days of post-launch support at no extra cost. After that, we offer retainer plans starting at $4K/month for ongoing feature work, Stripe webhook monitoring, Plaid token health checks, and Datadog alerting. Most fintech clients stay on a retainer because compliance requirements change quarterly and you'll want engineers who already know your codebase.
Yes. We've integrated with banking-as-a-service platforms like Unit, Treasury Prime, Synapse (now Tabapay), and Column. If your partner has a REST or GraphQL API with documentation, we can wire it in. We'll review their API docs during discovery week and flag any gaps -- some BaaS APIs have quirks around webhook reliability or sandbox parity that are better caught early than in production.
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