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Mark Rees

PROFILE

Mark Rees

Worked on the ministryofjustice/cloud-platform-environments and cloud-platform-user-guide repositories, delivering features that improved cloud infrastructure reliability, security, and developer experience. Built and optimized AWS RDS environments using Terraform, enabling production-like testing and cost-aware resource management. Enhanced cross-environment event routing and IAM/SQS policy configurations to support robust integration and safer deployments. Consolidated and clarified documentation for AWS IRSA policy management, reducing onboarding time and configuration errors. Upgraded CI/CD pipelines by migrating to GitHub Actions and restoring service account integrations. Demonstrated expertise in AWS, Kubernetes, and Infrastructure as Code, with a focus on maintainable, well-documented solutions that streamline cloud platform operations.

Overall Statistics

Feature vs Bugs

87%Features

Repository Contributions

42Total
Bugs
2
Commits
42
Features
13
Lines of code
1,045
Activity Months8

Your Network

685 people

Work History

May 2026

3 Commits • 1 Features

May 1, 2026

May 2026 monthly summary for ministryofjustice/cloud-platform-environments: Key RDS capacity and storage optimization for HMPS Person Record System delivered in pre-production with production-aligned sizing and cost-conscious rollback plan. This work improves test performance readiness, reduces risk of production capacity bottlenecks, and enables ongoing cost control without sacrificing performance.

January 2026

2 Commits • 2 Features

Jan 1, 2026

January 2026 monthly summary for ministryofjustice/cloud-platform-environments focusing on deliverables and business impact. Key features delivered include reinstating default AWS provider configuration in Terraform to enable automatic tagging and region specification without per-resource provider definitions. This reduces configuration drift and simplifies environment provisioning. Also improved documentation clarity for the hmpps-person-record-servicenow-client secret by providing a concise description and aligning secret usage with default provider tagging.

September 2025

4 Commits • 2 Features

Sep 1, 2025

September 2025: Delivered targeted event subscription improvements and performed cleanup to simplify data flows in the cloud platform environments repository. Key changes include enabling probation alias domain events across preprod and prod to reliably process offender alias changes, and removing obsolete CPR Delius offender event subscriptions to reduce unused data traffic. These actions improve data accuracy, reduce maintenance overhead, and support smoother deployment pipelines.

August 2025

19 Commits • 4 Features

Aug 1, 2025

August 2025 – Cloud Platform Environments: Key CI/CD upgrades, service deployments, and queue workflows delivering faster, safer environment provisioning and stronger governance. Key features delivered: migrated CI to GitHub Actions with prod workflows and reviewer teams; added initial service pod for person-match service account; implemented PIC link/unlink queue functionality with access to DLQ. Major bugs fixed: CircleCI service account restoration to reinstate CI integration; versioning fixes and unique naming for the person-match service pod. Impact: reduced deployment risk, improved reliability of person-match deployments, and enabling new PIC-driven workflows. Technologies/skills: Kubernetes deployments, CI/CD tooling (CircleCI, GitHub Actions), queue management (PIC link/unlink, DLQ), IAM/service accounts, RBAC, release hygiene.

July 2025

3 Commits • 1 Features

Jul 1, 2025

2025-07 Monthly summary: Implemented Cross-Environment Court Events Routing and Data Access to enable production-topic messages to reach pre-production queues, with updated IAM/SQS policies and access to the production CHER large-message S3 bucket for testing large payloads. These changes establish a production-like testing environment, improve end-to-end testing fidelity, and reduce deployment risk.

May 2025

7 Commits • 1 Features

May 1, 2025

May 2025 performance summary for ministryofjustice/cloud-platform-environments: Implemented a development read replica for the HMPPS Person Record PostgreSQL database via Terraform, delivering improved dev parity with production, faster feature validation, and cost-aware resource sizing. Fixed replication configuration issues and cleaned up secret fields to reduce blast radius. Key operational improvements include validating replicate_source_db, selecting appropriate instance types, and removing unused secrets and unneeded URL references. The combined effect is more reliable dev environments, lower ongoing costs, and safeguards against accidental downgrades.

March 2025

1 Commits • 1 Features

Mar 1, 2025

March 2025 monthly summary focusing on key accomplishments for ministryofjustice/cloud-platform-user-guide with a concentration on IRSA policy guidance improvements and documentation quality.

February 2025

3 Commits • 1 Features

Feb 1, 2025

February 2025 — ministryofjustice/cloud-platform-user-guide: Delivered consolidated documentation for cross-namespace AWS resource sharing using IRSA and SSM Parameter Store. Added a practical guide on combining IRSA policies to overcome the 15-policy limit and applied formatting enhancements to related templates. No major bugs fixed; efforts focused on improving security guidance and developer efficiency. Impact: reduces cross-team integration time, strengthens access controls, and provides a scalable reference for secure AWS resource access in Kubernetes. Technologies demonstrated: AWS IAM Roles for Service Accounts (IRSA), SSM Parameter Store, Kubernetes RBAC/security patterns, and documentation craftsmanship.

Activity

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Quality Metrics

Correctness93.8%
Maintainability93.8%
Architecture93.4%
Performance89.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

ERBHCLHTMLJSONMarkdownTerraform

Technical Skills

AWSAWS IAMCloud EngineeringCloud InfrastructureCloud Infrastructure ManagementCloud PlatformCloud Platform ConfigurationCloud Platform ManagementCloud ServicesCode FormattingDatabase ManagementDevOpsDocumentationIAMIRSA

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

ministryofjustice/cloud-platform-environments

May 2025 May 2026
6 Months active

Languages Used

HCLTerraformJSON

Technical Skills

AWSCloud InfrastructureCloud PlatformCloud Platform ConfigurationCloud Platform ManagementDatabase Management

ministryofjustice/cloud-platform-user-guide

Feb 2025 Mar 2025
2 Months active

Languages Used

ERBHTMLMarkdown

Technical Skills

AWSAWS IAMCode FormattingDocumentationIAMIRSA