ahuanca solution yape challenge

[IanAleksandr]

General solution

• Added two NestJS microservices: transaction-service (REST + PostgreSQL/Prisma + outbox) and anti-fraud-service (Kafka worker).
• Implement Hexagonal architecture, shared Avro contracts, and Docker-based infrastructure (Postgres, Redpanda, Schema Registry) with multi-stage builds that bundle compiled code, Prisma artifacts, and contracts.
• Ensure end-to-end flow: REST creation → outbox publish → Kafka message → anti-fraud decision → status update + secondary publish.

Highlights
Transaction Service

• REST API with validation, Swagger docs, Prisma repositories, and outbox publisher.
• Kafka publisher + schema registry integration; Prisma migrations and scripts for Docker runtime.
• Comprehensive unit/e2e tests for domain logic, services, persistence, and messaging.

Anti-Fraud Service
Kafka consumer evaluating transactions with deterministic decision engine.
Publishes status-change events via schema registry, exposes health logging, and wires Logger/DI.
Unit tests for decision process and service behavior.

Platform & Tooling
Shared contracts/avro folder copied into both images.
README documents architecture, Docker workflows, troubleshooting, and manual verification steps.

Testing
cd transaction-service && npm test
cd anti-fraud-service && npm test
Also I made a manual end-to-end verification via docker compose build --no-cache && docker compose up, POST transaction from container, observe anti-fraud logs.