The Challenge
A rapidly growing financial services startup needed to overhaul entirely their monolithic backend. The existing system was struggling to handle peak transaction loads, and looming regulatory requirements necessitated a significant upgrade in data encryption and access logging.
The Solution
We architected and deployed a hardened, modular REST API layer specifically designed for financial transactions. We implemented strict end-to-end encryption for all data in transit and at rest, integrating a dedicated secrets management system. The API was built with rate limiting, circuit breakers, and comprehensive compliance logging built-in.
System Architecture
The API is powered by Node.js and structured with Prisma for type-safe database access to PostgreSQL. HashiCorp Vault is integrated for dynamic secrets and encryption key management. The system sits behind an AWS API Gateway configured with WAF rules, ensuring protection against common web exploits and DDoS attacks.
Technology Stack
The Outcome
Successfully processed over $5M in transaction volume during the first month with 99.99% API uptime. The new architecture passed stringent third-party penetration testing and compliance audits on the first attempt, enabling the client to secure their Series A funding.