Web & App Development for FinTech Startups
Dashboards, payment flows, and financial tools built with the security and precision your users expect.
FinTech products move fast — and AI builders have made it easier than ever to get a working dashboard, payment flow, or account management UI in front of users quickly. But money introduces failure modes that don't show up in a demo: rounding errors in financial calculations, unverified payment webhooks, and authentication that isn't ready for real account access.
We help FinTech founders review and harden apps that handle real money — whether that's an AI-generated MVP that's about to onboard its first paying users, or an existing product that needs a security pass before a fundraising or compliance milestone.
What Matters Most for FinTech
- Accurate handling of currency, decimals, and financial calculations
- Secure integration with payment processors and banking APIs
- Strong authentication, including support for multi-factor auth
- Clear audit trails for transactions and account changes
- Performance under real transaction volume, not just demo data
How We Approach It
- Review and hardening of payment integrations such as Stripe and Plaid
- Correct handling of money values to avoid rounding and precision bugs
- Authentication flows with multi-factor support where needed
- Database design that supports clear transaction history and reconciliation
- Performance tuning for real transaction volume and usage patterns
Frequently Asked Questions
Our app handles payments — what should we check before launch?
Start with how money values are stored and calculated (to avoid floating-point errors), how payment provider webhooks are verified, and whether sensitive data ever touches your own servers unnecessarily. We cover all of this in an AI App Rescue audit.
Can you integrate Stripe or Plaid into our existing app?
Yes — we regularly add or harden payment and banking integrations on top of existing codebases, including AI-generated ones.
Do you help with PCI compliance?
We help implement the technical practices PCI compliance relies on, such as never storing raw card data and using tokenized payment flows. Full PCI certification also involves a broader compliance process.
We Also Build For
Healthcare & HealthTech
From patient portals to clinical dashboards — built with the privacy, accessibility, and reliability healthcare products demand.
Learn moreE-commerce
Storefronts, checkout flows, and admin dashboards that convert — and hold up under real traffic.
Learn moreLegal Tech
Document workflows, client portals, and case management tools built with the precision and confidentiality legal work demands.
Learn moreBuilding for FinTech? Let's make sure it's production-ready.
Whether you need a security review, new features, or a full AI App Rescue, we can scope a fixed-price engagement around your stack.
Get in Touch