Dilwoar Hussain focused on security hardening and stability improvements for the alphagov/notifications-template-preview repository during October 2025. He addressed a critical vulnerability by upgrading the ImageMagick package in the Dockerfile to a stable, Debian Bullseye-compatible version, reducing exposure to known CVEs and ensuring safer template rendering in production environments. His work centered on DevOps and package management, leveraging Dockerfile best practices to maintain predictable builds without altering public APIs. The update was delivered as a single, well-documented patch, supporting secure release practices and providing clear traceability for future audits, reflecting a targeted and methodical approach to infrastructure maintenance.