During March 2026, Jason developed a cross-hypervisor sandbox testing capability for the UKGovernmentBEIS/inspect_ai repository, enabling scalable and reproducible model testing across any VM hypervisor supported by Hashicorp Vagrant. He engineered the Inspect Vagrant Sandbox and integrated an automated pricing data plugin, allowing cost-aware evaluation and budgeting for experiments. Jason focused on plugin development and comprehensive documentation, using Markdown to create an extensions documentation page that accelerates onboarding and improves feature discoverability. His work demonstrated depth in Vagrant and plugin architecture, addressing both technical and usability challenges to support broader test coverage and more transparent cost management for model evaluation.