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Payment platform modernization for fintech
Confidential fintech client
fintech cloudbackenddevops
Challenge
The client operated on a monolithic Java architecture that couldn’t keep up with growing transaction volumes. Deployments took hours and required maintenance windows. Lack of autoscaling caused issues during peak hours.
Solution
We conducted a step-by-step migration - no big-bang rewrite. Key elements:
- Monolith decomposition into microservices (domain-driven bounded contexts)
- Migration to Kubernetes (EKS) with Terraform IaC
- CI/CD pipeline with automated tests and canary deployments
- Event-driven architecture with Apache Kafka for transaction processing
Results
- 40% reduction in infrastructure costs (right-sizing + spot instances)
- 99.99% uptime vs. 99.5% before migration
- 8-minute deployments (vs. 4 hours previously)
- 3x throughput increase with no hardware changes
"The PST team delivered a solution that cut our infrastructure costs by 40% and reduced deployment time from hours to minutes."
Jan Kowalski
CTO, fintech client
Published: 15 January 2026