Multi-Bank Digital Wallet & Yield Management System

Author
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2025

Overview

Witty a digital wallet with integrated investments partnered with Blend to integrate a secure and scalable architecture to support seamless transactions and financial services for unbanked individuals, driving financial inclusion through seamless access to deposits, transfers, withdrawals, bill payments, and investments.

Challenge

  • A large share of Colombia’s population remains unbanked, limiting access to financial services.
  • High costs and complex requirements of traditional banking exclude many individuals.
  • Slow, inefficient ACH-based interbank transactions delay payments and disrupt cash flow.
  • The client aimed to bridge this gap with a secure, low-cost digital wallet enabling transactions without a traditional bank account.

Solution

  • Secure Web access (Public Subnet): Amazon CloudFront for in-app optimized content delivery, AWS WAF for security, and ALB for load balancing.
  • Backend (Private Subnet): Amazon Elastic Container Service (ECS) for secure backend services within an Amazon VPC to manage transaction processing and financial operations.
  • Storage Stack: Amazon S3 buckets for logging and storing security-related data, Amazon RDS instances for secure database management.
  • Identity & Authentication: AWS Cognito for secure user authentication and access control.
  • Security & Compliance: AWS GuardDuty monitors threats, AWS KMS encrypts sensitive data, and Amazon VPC isolates internal services for maximum security.  

Impact

  • Faster, more cost-effective payments, making financial services accessible to a broader population.
  • Reduced banking infrastructure and transaction costs via digital transactions and Cloud-native architecture.
  • Enabled scalable, pay-as-you-go model through AWS cloud services.
  • Accelerated transaction processing and improved user satisfaction.
  • Enhanced operational efficiency and long-term sustainability via automation.
  • Validated the cost-effectiveness of Witty’s digital financial model for advancing financial inclusion.

Key Data Points

60%
reduction in overhead expenses
40%
decrease in user fee
50%
reduction in long-term operational expenses