What is fintech-wallet?

FinTech Wallet Platform is a demonstration of how a digital wallet system for a bank or payments company could be built using a microservices architecture, where the overall system is split into several small, independently deployable services instead of one large application. It handles things a real financial product would need: user registration and login with multi-factor authentication, identity verification documents, wallet balances, peer-to-peer money transfers recorded with proper double-entry bookkeeping, automated risk scoring to catch suspicious transactions, and sending email and text message notifications to users. The system is organized into five separate services that each do one job: authentication and identity checks, wallet balance and deposit or withdrawal handling, transaction processing between users, compliance and risk checks, and multi-channel notifications. These services talk to each other in two ways, using Apache Kafka to broadcast events like a completed transaction that other services react to, and using gRPC for direct request and response calls between services that need an immediate answer, such as checking a user's risk status before allowing a transfer. Each service is built with the NestJS framework in TypeScript, following a layered design that separates business rules from technical details like databases, and is backed by a shared PostgreSQL database and Redis for caching, one-time codes, and background job queues. The project includes infrastructure code written in Terraform to provision the AWS resources needed to run it in the cloud, such as networking, container hosting, and the database, along with a GitHub Actions pipeline meant to build and deploy each service automatically. Each of the five services also has its own separate documentation file with more detailed setup instructions. The project is released under the MIT license.