Supplier Self-Billing Platform

The problem

Supplier billing was previously supplier-initiated and manually reconciled, which made it slow to process and harder to guarantee compliance with the Groceries Supply Code of Practice (GSCOP) — a strict regulatory requirement for how UK grocers must handle supplier payments.

What changed

• Built the core microservices for a self-billing model, where the retailer generates and issues supplier invoices directly, using Java and Spring Boot.
• Implemented automated tax calculation logic and full audit trails for every invoice generated, to satisfy GSCOP compliance requirements end to end.
• Used SQL Server for transactional invoice data and MongoDB for higher-volume audit/event logging.
• Set up AKS deployments backed by Azure DevOps CI/CD pipelines.

Result

• 100% GSCOP compliance on all generated supplier invoices, with a complete audit trail for every transaction.
• Deployment lead time cut by 30% after moving to AKS with Azure DevOps CI/CD, versus the previous release process.