Scaling a Fintech SaaS Platform with AWS Serverless Architecture

Strategic Need for Infrastructure Overhaul

The company’s monolithic infrastructure created critical bottlenecks across the platform — affecting everything from response time to release velocity. As transaction volumes spiked, performance degradation and instability became more frequent. Every new feature shipped carried the risk of breaking something downstream.

Inspirit was brought in to lead a legacy system modernization, with a focus on delivering a cloud-native, scalable architecture that would support business growth while improving system reliability and cost-efficiency.

Two major challenges emerged during the project

Rebuilding with AWS Serverless and Microservices

To meet these challenges, we leveraged event-driven patterns, implemented real-time monitoring, and designed with fault isolation from day one.

We re-architected the platform using a modern AWS serverless architecture designed specifically for fintech infrastructure that needs to scale rapidly and perform under load. Key components included:

• AWS ECS Fargate to enable scalable, container-based compute with zero server management overhead
• AWS Lambda to break core logic into lightweight, event-triggered microservices
• Amazon Aurora (PostgreSQL) and AWS RDS to resolve performance constraints and support high-volume relational data
• AWS SQS and SNS for reliable messaging and asynchronous, fault-tolerant service communication

Together, these services enabled a cost-optimized, high-availability system that positioned the client to scale seamlessly.