Case study · Fintech

Anonymized client – Fintech: a PCI-ready payment gateway

We rebuilt a fintech's payment gateway from a fragile monolith into a PCI-ready, multi-region platform designed to absorb traffic spikes without downtime.

The client is anonymized, so results are shown as ranges rather than exact figures.

Software Development DevOps & Cloud

Client (anonymized): A UK payments company
Industry: Fintech
Country: United Kingdom
Year: 2025
Duration: 16 weeks

Tech stack

LaravelReactPostgreSQLRedisAWSKubernetesTerraform

Measurable results

The numbers

99.99%

Uptime target

AWS regions

Up to 63%

Faster API responses

16 wks

Discovery to cut-over

The problem

The legacy PHP monolith went down during traffic spikes, costing the client merchants and trust.
The upcoming PCI DSS audit required network segmentation and audit trails the old system couldn't provide.
The in-house team of three couldn't rebuild and run production at the same time.

The solution

Split the monolith into a Laravel core API, a tokenisation service and a webhook dispatcher, deployed on EKS across two AWS regions.
Codified every resource in Terraform with segmented VPCs, KMS encryption and immutable audit logs.
Migrated live traffic gradually with a strangler pattern, designed for zero downtime.

Architecture