Payment Pipeline Modernisation

Challenge

A UK-based fintech was running a monolithic payment processing system that could not scale beyond peak-day volumes. Deployments required full-system downtime, and the lack of observability made incident response slow and error-prone.

Approach

• Decomposed the monolith into event-driven microservices using SQS, SNS, and EventBridge
• Implemented exponential backoff retry with dead-letter queues for payment resilience
• Introduced structured logging, distributed tracing, and real-time dashboards
• Migrated incrementally using the strangler fig pattern — zero downtime throughout

Results

Technologies