Month: 2026-06 — Delivered performance and maintainability improvements across DEFRA/epr-calculator-api and DEFRA/epr-calculator-service, focusing on billing efficiency, data reuse, precision, and code cleanliness. Enabled faster billing runs, consistent calculation ordering, and streamlined data packaging.

May 2026: Delivered core data integrity and billing enhancements across the EPR calculator services, with RAM-integrated calculations and improved billing export fidelity. Achieved notable accuracy gains in material tonnage projections and producer filtering, while fixing critical data-serialization issues in SaSetupCosts and UI display for billing.

April 2026: Key features delivered and major fixes across DEFRA/epr-calculator-api and DEFRA/epr-calculator-service, driving data accuracy, reporting capability, and projection-enabled billing. Highlights include corrected migration parameter order, enhanced data model with SubmissionPeriod and a new projection table, H1/H2 projection support with expanded CSV export, and strengthened robustness for H1-only scenarios with improved tests. These efforts reduced risk of incorrect updates, enabled richer reporting, and improved accuracy of billing projections across submission periods.

March 2026: Delivered core data integrity improvements and modulation features across the calculator stack (service, API, and frontend). Implemented POM data filtering by obligated submitter, suppressed non-actionable Synapse warnings when no POM/NoL, introduced RAG-based late tonnage modulation across results and the cost builder, extended the API with modulation default parameters for materials and tonnage, and enhanced frontend visibility of modulation parameters. These changes improve data accuracy, reduce log noise, and provide clearer visibility into modulation factors for late reporting tonnage, aligning with business goals of reliable reporting and cost calculations.

February 2026 monthly summary for DEFRA epr-calculator projects. Delivered key features that modernize invoicing and billing data layers, improving accuracy, maintainability, and reliability. By migrating current-year invoiced total calculations post-rebill and replacing stored procedures with service- and EF-based implementations, the platform now supports more robust data flows and easier evolution.

January 2026 performance summary for the DEFRA EPR Calculator suite: delivered core data-model enhancements, advanced partial-obligations calculations, and reliability improvements across API, service, and frontend. Business value includes improved personnel-change tracking, scalable partial obligations processing, accurate reporting for compliance, and stronger deployment hygiene.

December 2025 monthly summary focusing on key accomplishments in the DEFRA EPR calculator suite. The team delivered targeted improvements to error handling and Synapse-origin error reporting across the calculator service and API, strengthening observability, triage efficiency, and overall reliability. Work completed aligns with business goals of reducing downtime, accelerating issue resolution, and improving the accuracy of user-facing calculations.