
Dev Arrowsmith delivered end-to-end enhancements to the ministryofjustice/hmpps-electronic-monitoring-create-an-order and related API repositories, building robust order creation, variation, and monitoring workflows for electronic monitoring. They engineered backend endpoints and frontend flows using TypeScript, JavaScript, and Spring Boot, focusing on data integrity, validation, and user experience. Their work included feature flag frameworks, comprehensive form validation, and integration of file uploads with type and size enforcement. By refactoring UI components and standardizing error handling, Dev improved maintainability and reduced user errors. Test automation with Cypress and Jest ensured reliability, while configuration management and documentation updates supported scalable, compliant deployments.

September 2025: Delivered substantive data, UI, and testing improvements across two HMPS Electronic Monitoring repositories, driving data integrity, faster and safer workflows, and improved developer experience.
September 2025: Delivered substantive data, UI, and testing improvements across two HMPS Electronic Monitoring repositories, driving data integrity, faster and safer workflows, and improved developer experience.
August 2025 monthly summary: Delivered end-to-end enhancements to the electronic monitoring order creation platforms (API and UI), with a focus on data integrity, flexible order variation, and improved user experience. Key features delivered include a new Order Variation endpoint with backend variation creation and confirmation UX, comprehensive validation improvements across frontend and backend (including 200-character input limits and postcode alignment), and expanded enforcement zone map uploads with PNG support. Additional work improved navigation flow from Check Your Answers pages, updated map tool UX (opening in a new tab) and related help text. These changes were reinforced by scenario and integration tests and controlled via feature flags to enable safe rollout. The work delivers measurable business value by enabling faster, compliant order changes, reducing user errors, and increasing map upload flexibility for field teams. Technologies demonstrated include backend API design and testing, frontend validation and UX enhancements, test automation, and feature-flag controlled deployments.
August 2025 monthly summary: Delivered end-to-end enhancements to the electronic monitoring order creation platforms (API and UI), with a focus on data integrity, flexible order variation, and improved user experience. Key features delivered include a new Order Variation endpoint with backend variation creation and confirmation UX, comprehensive validation improvements across frontend and backend (including 200-character input limits and postcode alignment), and expanded enforcement zone map uploads with PNG support. Additional work improved navigation flow from Check Your Answers pages, updated map tool UX (opening in a new tab) and related help text. These changes were reinforced by scenario and integration tests and controlled via feature flags to enable safe rollout. The work delivers measurable business value by enabling faster, compliant order changes, reducing user errors, and increasing map upload flexibility for field teams. Technologies demonstrated include backend API design and testing, frontend validation and UX enhancements, test automation, and feature-flag controlled deployments.
July 2025 monthly summary: Delivered performance, UX, and reliability improvements across two HM Prison & Probation Service electronic monitoring projects, translating into faster feedback cycles, clearer user guidance, and more maintainable backend code. Key features and fixes reduced release friction, improved data integrity, and strengthened developer velocity.
July 2025 monthly summary: Delivered performance, UX, and reliability improvements across two HM Prison & Probation Service electronic monitoring projects, translating into faster feedback cycles, clearer user guidance, and more maintainable backend code. Key features and fixes reduced release friction, improved data integrity, and strengthened developer velocity.
June 2025: Strengthened test infrastructure, expanded DDv5 coverage, and enforced data completeness for monitoring conditions across two HM Prison and Probation Service electronic monitoring projects. Delivered concrete business value by improving data integrity, reducing regression risk, and enabling readiness for DDv5 notification workflows across both frontend and API layers.
June 2025: Strengthened test infrastructure, expanded DDv5 coverage, and enforced data completeness for monitoring conditions across two HM Prison and Probation Service electronic monitoring projects. Delivered concrete business value by improving data integrity, reducing regression risk, and enabling readiness for DDv5 notification workflows across both frontend and API layers.
May 2025 produced a focused set of UX improvements, reliability enhancements, and governance improvements across the HM PPS electronic monitoring projects. Key user-facing updates clarified the service purpose on the Start page, added an invitation-only banner, and refined copy; UI/UX updates on monitoring conditions streamlined data entry and disabled unsupported options; time display formatting is standardized to HH:mm for readability; order/task statuses were clarified with an 'Optional' label for Additional Documents; and a new feature flag framework enabled safer, dynamic toggling for Cypress tests and deployment configurations. These changes span both the front-end EMO create-an-order and the API, delivering clearer onboarding, better data quality, more deterministic test outcomes, and safer rollout of new data dictionary versions.
May 2025 produced a focused set of UX improvements, reliability enhancements, and governance improvements across the HM PPS electronic monitoring projects. Key user-facing updates clarified the service purpose on the Start page, added an invitation-only banner, and refined copy; UI/UX updates on monitoring conditions streamlined data entry and disabled unsupported options; time display formatting is standardized to HH:mm for readability; order/task statuses were clarified with an 'Optional' label for Additional Documents; and a new feature flag framework enabled safer, dynamic toggling for Cypress tests and deployment configurations. These changes span both the front-end EMO create-an-order and the API, delivering clearer onboarding, better data quality, more deterministic test outcomes, and safer rollout of new data dictionary versions.
December 2024: Delivered end-to-end Monitoring Start/End Time capture and display for the HMPS electronic monitoring order flow. Refactored date/time input components to support combined date and time selections, enhanced form validation, and ensured times are correctly processed, validated, and displayed across the UI and API payloads (including the check your answers pages). This work improves data accuracy for monitoring, supports compliance reporting, and provides a clearer audit trail.
December 2024: Delivered end-to-end Monitoring Start/End Time capture and display for the HMPS electronic monitoring order flow. Refactored date/time input components to support combined date and time selections, enhanced form validation, and ensured times are correctly processed, validated, and displayed across the UI and API payloads (including the check your answers pages). This work improves data accuracy for monitoring, supports compliance reporting, and provides a clearer audit trail.
November 2024: Delivered end-to-end order submission capabilities for the electronic monitoring project across API and UI layers. Implemented an API endpoint with comprehensive validation and robust error handling, establishing reliable submission workflows and clearer user feedback. Delivered a UI flow enabling users to submit orders from the frontend with updated status handling and improved error messaging. Implemented resilience against Serco integration failures by catching and surfacing unexpected submission errors, reducing unhandled failure scenarios. Result: reduced submission friction, improved data quality, and faster processing of orders. Technologies demonstrated include REST API design, input validation, exception handling, frontend-backend integration, UI/UX error messaging, and test automation.
November 2024: Delivered end-to-end order submission capabilities for the electronic monitoring project across API and UI layers. Implemented an API endpoint with comprehensive validation and robust error handling, establishing reliable submission workflows and clearer user feedback. Delivered a UI flow enabling users to submit orders from the frontend with updated status handling and improved error messaging. Implemented resilience against Serco integration failures by catching and surfacing unexpected submission errors, reducing unhandled failure scenarios. Result: reduced submission friction, improved data quality, and faster processing of orders. Technologies demonstrated include REST API design, input validation, exception handling, frontend-backend integration, UI/UX error messaging, and test automation.
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