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Banco Caja Social · Banking · 2023 — 2024

CDT Digital: opening a CD without setting foot in a branch

We built the entire product, from the full frontend to the integrations with the bank's core systems. It was the bank's best product three years in a row, the team won an award for it, and it's still in production exactly as we built it.

raised in the first two years (≈ USD 500K)
COP 2B+
Type
Employment
Stack
  • React
  • Next.js
  • NestJS
  • TypeScript
  • Azure DevOps
  • SonarCloud
  • Google Analytics
Status
View live (opens in a new tab)

The challenge

Opening a certificate of deposit (CDT) meant going to a branch. The bank wanted to move account opening and deposit collection to digital without giving up the security and compliance a financial product requires.

What we built

I joined the team in my second year at the bank, after a year in the Marketing department. We built the MVP and then the improved version: the entire frontend for the opening flow and every integration with the services connected to the bank’s core business.

  • A 100% online opening experience that’s easy to follow and secure.
  • Frontend in React and Next.js, middle-tier services in NestJS, and TypeScript across the stack.
  • Code quality and security with SonarCloud, CI/CD on Azure DevOps, and user behavior tracking with Google Analytics.

How we worked

We used TDD (test-driven development), a methodology that was new to me and turned out to be the best I’ve worked with. At a bank, every release goes through strict quality and information security controls. That rigor is what let us ship a product that’s still running exactly as we left it.

The result

  • We hit the account opening and deposit targets set by management within the first six months.
  • We raised over COP 2 billion (≈ USD 500K) in the first two years.
  • It was the bank’s best product three years in a row, and the team won an award for it.
  • It’s still in production exactly as we built it.
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