
Over six months, Stefan Hristov engineered cloud infrastructure and cost management solutions across several Ministry of Justice repositories, including cloud-optimisation-and-accountability and modernisation-platform-environments. He delivered features such as Grafana dashboard enhancements for cost visibility, S3 bucket policy modernization using Terraform, and multi-destination S3 data export pipelines. Stefan’s technical approach emphasized infrastructure as code, leveraging Terraform, HCL, and AWS IAM to centralize policy management, streamline provisioning, and improve governance. His work addressed operational complexity by deprecating legacy CI/CD workflows, aligning vulnerability management policies, and automating Slack notifications, resulting in more maintainable, auditable, and secure cloud environments with reduced operational overhead.
November 2025 monthly summary: Delivered governance and infrastructure simplification initiatives for the cloud optimisation and accountability project. Key initiatives included: (1) AWS infrastructure management migration — deprecated Terraform provisioning and introduced IAM policy guidance; added policy guidance on IAM Trust Relationships and removed Terraform resources, simplifying the provisioning surface and reducing tooling debt; (2) Vulnerability management policy alignment — continued using Dependabot for CVE management, with documentation updates reflecting this policy; (3) Slack notifications for new GitHub issues — implemented a GitHub Actions workflow to post new issue alerts to Slack, updated the channel ID, and later removed the workflow to minimize noise. Overall, these efforts improve security governance, reduce operational and compliance risk, and streamline issue-response and deployment workflows.
November 2025 monthly summary: Delivered governance and infrastructure simplification initiatives for the cloud optimisation and accountability project. Key initiatives included: (1) AWS infrastructure management migration — deprecated Terraform provisioning and introduced IAM policy guidance; added policy guidance on IAM Trust Relationships and removed Terraform resources, simplifying the provisioning surface and reducing tooling debt; (2) Vulnerability management policy alignment — continued using Dependabot for CVE management, with documentation updates reflecting this policy; (3) Slack notifications for new GitHub issues — implemented a GitHub Actions workflow to post new issue alerts to Slack, updated the channel ID, and later removed the workflow to minimize noise. Overall, these efforts improve security governance, reduce operational and compliance risk, and streamline issue-response and deployment workflows.
Summary for 2025-10: Implemented a comprehensive infrastructure cleanup by deprecating Terraform configurations and CI/CD workflows, removing Auth0 integration and legacy GitHub resources, and reorganizing remaining IaC assets. This work consolidates state management, reduces surface area, eliminates outdated automation, and lowers operational overhead. Representative commits include 976d207, 5a7e704, f7955d5, 7eadcdf, 18c599ee, ed556974, and 1a1cc5bf.
Summary for 2025-10: Implemented a comprehensive infrastructure cleanup by deprecating Terraform configurations and CI/CD workflows, removing Auth0 integration and legacy GitHub resources, and reorganizing remaining IaC assets. This work consolidates state management, reduces surface area, eliminates outdated automation, and lowers operational overhead. Representative commits include 976d207, 5a7e704, f7955d5, 7eadcdf, 18c599ee, ed556974, and 1a1cc5bf.
2025-09 Monthly Summary for ministryofjustice/modernisation-platform-environments: Implemented S3 Bucket Policy Management Modernization using Terraform. Replaced template-based IAM policies with Terraform IAM policy document data sources, centralized policy definitions, and updated syntax to remove deprecated interpolation for Terraform compatibility and improved clarity. This work reduces policy drift, improves maintainability, and supports consistent security controls across environments.
2025-09 Monthly Summary for ministryofjustice/modernisation-platform-environments: Implemented S3 Bucket Policy Management Modernization using Terraform. Replaced template-based IAM policies with Terraform IAM policy document data sources, centralized policy definitions, and updated syntax to remove deprecated interpolation for Terraform compatibility and improved clarity. This work reduces policy drift, improves maintainability, and supports consistent security controls across environments.
In August 2025, delivered a robust S3 CUR v2 hourly export with multi-destination replication for MOJAP-DATA-PRODUCTION-CUR-V2-HOURLY in ministryofjustice/aws-root-account. Implemented an hourly data export to a new AP bucket and enabled multi-destination replication to multiple destinations, including production replication, with Terraform adjustments and Terraform module migrations to Community S3 modules. This included refactoring to ensure compatibility with new bucket modules, updating IAM roles/policies, and aligning resource declarations with the new structure.
In August 2025, delivered a robust S3 CUR v2 hourly export with multi-destination replication for MOJAP-DATA-PRODUCTION-CUR-V2-HOURLY in ministryofjustice/aws-root-account. Implemented an hourly data export to a new AP bucket and enabled multi-destination replication to multiple destinations, including production replication, with Terraform adjustments and Terraform module migrations to Community S3 modules. This included refactoring to ensure compatibility with new bucket modules, updating IAM roles/policies, and aligning resource declarations with the new structure.
Month: 2025-07 | Repository: ministryofjustice/modernisation-platform-environments Key features delivered: - S3 Bucket Policy Simplification: removed an unused KMS encryption policy from the S3 bucket to simplify configuration and reduce policy surface. Major bugs fixed: - No major bugs reported in this period (based on available data). Overall impact and accomplishments: - Streamlined security policy management across environments, reducing maintenance overhead and lowering risk of misconfigurations. - Improved operational efficiency and policy traceability for future changes. Technologies/skills demonstrated: - AWS S3/IAM policy management, policy-as-code discipline, change management, and clear commit messaging (example commit: 5a6ee4ab145b2acc3bbee6389304731af520da17).
Month: 2025-07 | Repository: ministryofjustice/modernisation-platform-environments Key features delivered: - S3 Bucket Policy Simplification: removed an unused KMS encryption policy from the S3 bucket to simplify configuration and reduce policy surface. Major bugs fixed: - No major bugs reported in this period (based on available data). Overall impact and accomplishments: - Streamlined security policy management across environments, reducing maintenance overhead and lowering risk of misconfigurations. - Improved operational efficiency and policy traceability for future changes. Technologies/skills demonstrated: - AWS S3/IAM policy management, policy-as-code discipline, change management, and clear commit messaging (example commit: 5a6ee4ab145b2acc3bbee6389304731af520da17).
June 2025 performance summary: Delivered key cost-visibility enhancements and budgeting foundations across two repositories, driving improved cost control and governance. Grafana Cost Dashboard enhancements improved service-area filtering, data presentation, and panel clarity; AWS Cost Categories Budgets Foundation established budgets and REGULAR rules for critical accounts. Also implemented costs-rule accuracy improvements to fix typos and improve matching in Cost Explorer. These changes deliver measurable business value by improving cost visibility, budgeting accuracy, and governance across the cloud estate.
June 2025 performance summary: Delivered key cost-visibility enhancements and budgeting foundations across two repositories, driving improved cost control and governance. Grafana Cost Dashboard enhancements improved service-area filtering, data presentation, and panel clarity; AWS Cost Categories Budgets Foundation established budgets and REGULAR rules for critical accounts. Also implemented costs-rule accuracy improvements to fix typos and improve matching in Cost Explorer. These changes deliver measurable business value by improving cost visibility, budgeting accuracy, and governance across the cloud estate.

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