The Challenge
Our client, a rapidly growing US-based FinTech startup, was struggling with a legacy monolithic architecture. As their user base expanded, the system experienced significant latency issues, frequent downtimes during peak trading hours, and skyrocketing AWS infrastructure costs.
The primary bottlenecks were:
- Tightly coupled database queries leading to deadlocks.
- Inability to scale individual components independently.
- Slow deployment cycles due to the massive codebase size.
Our Approach
The LensCraft team conducted a comprehensive 2-week architectural audit. We proposed a phased migration to a microservices architecture running on AWS Elastic Kubernetes Service (EKS).
Key Technical Decisions:
- Domain-Driven Design (DDD): We identified bounded contexts (User Management, Transactions, Notifications) to split the monolith logically.
- Event-Driven Communication: Implemented AWS SNS and SQS to decouple services and ensure reliable asynchronous communication.
- Database Segregation: Migrated from a single massive PostgreSQL instance to specialized databases (PostgreSQL for transactions, DynamoDB for high-volume logs).
The Results
The transformation yielded immediate and measurable results:
- Latency Reduced by 40%: API response times dropped significantly.
- Cost Reduction: AWS infrastructure costs were reduced by 25% through optimized resource allocation and auto-scaling.
- Zero Downtime Deployments: The engineering team can now deploy individual services independently without affecting the entire platform.
"LensCraft didn't just fix our code; they transformed our entire engineering capability." — CTO, FinTech Startup