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David Teeling

PROFILE

David Teeling

Over 17 months, contributed to the ministryofjustice/modernisation-platform-environments and related repositories by engineering robust cloud infrastructure, automating deployments, and strengthening security controls. Delivered features such as environment-scoped IAM roles, automated AWS Backup integration, and blue/green deployment strategies, using Terraform and Python to manage infrastructure as code and workflow automation. Enhanced observability and compliance through CloudWatch monitoring, GDPR-compliant migration workflows, and centralized log retention. Improved deployment reliability with CI/CD pipelines, capacity-based scaling, and configuration management. Focused on maintainability and governance, modularized resource definitions, and enabled safer cross-environment data management, demonstrating depth in AWS, DevOps, and cloud engineering practices throughout.

Overall Statistics

Feature vs Bugs

80%Features

Repository Contributions

138Total
Bugs
13
Commits
138
Features
53
Lines of code
11,067
Activity Months17

Work History

July 2026

2 Commits • 2 Features

Jul 1, 2026

July 2026 monthly summary focusing on deployment safety, access governance, and cross-team collaboration across MOJ platform environments. Deliverables stabilized testing environments and improved reporting capabilities. No critical bugs fixed this month; stability work focused on deployment gating and RBAC.

June 2026

12 Commits • 3 Features

Jun 1, 2026

June 2026: Delivered capacity-aware WebLogic deployment optimizations, introduced legacy URL handling with ACM certificates, and evolved VPC trunking policy to balance scalability, security, and cost. This work enhances reliability, reduces waste, and speeds deployments for mission-critical environments across the modernisation-platform-environments repo.

May 2026

10 Commits • 5 Features

May 1, 2026

May 2026 was characterized by a strong focus on WebLogic modernization, scalable deployment reliability, and resource optimization across the platform. Delivered a series of WebLogic deployment and capacity improvements, refined preproduction configurations, and targeted fixes to ensure consistent environments and reduced risk during releases. These efforts materially improve resource utilization, deployment speed, and system reliability for production and preproduction environments.

April 2026

4 Commits • 4 Features

Apr 1, 2026

April 2026: Delivered automation and deployment enhancements across four core repositories, focusing on reliability, maintainability, and testing capabilities. Replaced the JSON renderer in LDAP workflows with jq for clearer task definition generation; enabled WebLogic capacity providers for testing; implemented a blue/green deployment pattern for jitbit to reduce downtime and improve safety; introduced ECS CI/CD enhancements and Terraform IaC modules with static analysis, formatting, and documentation generation. Overall, these changes improved deployment confidence, reduced risk during releases, and expanded testing capabilities across the platform.

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026 performance summary across two MOJ repositories: ministryofjustice/modernisation-platform-terraform-ecs-cluster and ministryofjustice/modernisation-platform-environments. Focused on delivering business value through CI/CD automation, IaC quality, and production-readiness improvements, with concrete deliverables and traceable commits.

February 2026

11 Commits • 2 Features

Feb 1, 2026

February 2026: Delivered two key initiatives across ministryofjustice/modernisation-platform and ministryofjustice/cloud-platform-environments. Focused on modularizing resource definitions for clearer ownership and stronger access controls, and on cross-environment data management with OpenSearch, S3, IAM, and SSM enhancements. The work improves maintainability, security, and reliability, enabling safer data sharing between pre-prod and prod and faster incident recovery.

December 2025

2 Commits • 1 Features

Dec 1, 2025

December 2025 — HM Prison and Probation Service (hmpps-delius-operational-automation) monthly summary. Delivered GDPR-compliant, environment-aware database migration workflow and Helm chart update process via a structured GitHub Actions pipeline. This enables safer, auditable deployments across environments (prod/staging/test) with clearly separated jobs and secure credentials handling. The initiative reduces deployment risk, enhances data governance, and accelerates time-to-production for migration-related updates. Key work included integration of a GDPR-focused migration workflow and environment-aware deployment steps, validated through targeted tests.

October 2025

6 Commits • 3 Features

Oct 1, 2025

Concise monthly summary for 2025-10 highlighting key features delivered, major bugs fixed, overall impact and accomplishments, and technologies/skills demonstrated. The focus is on business value and technical achievements delivered across the two repositories: ministryofjustice/modernisation-platform-environments and ministryofjustice/modernisation-platform.

September 2025

5 Commits • 3 Features

Sep 1, 2025

September 2025: Delivered key enablement, stability, and environment improvements across the Modernisation Platform portfolio to accelerate delivery, improve reliability, and support secure, scalable operations.

August 2025

15 Commits • 6 Features

Aug 1, 2025

August 2025 focused on security, reliability, and governance improvements across the Modernisation Platform. Delivered secure infrastructure access provisioning, event-driven observability for ECS retirement, centralized LDAP log retention, and deployment/configuration hardening, while enabling HTTPS for legacy services and expanding test execution in the Modernisation Platform. These efforts reduced deployment friction, strengthened security posture, and improved operational governance.

July 2025

7 Commits • 4 Features

Jul 1, 2025

Concise monthly summary for 2025-07: Delivered key features for cross-environment testing, hardened database access security, updated SSH key management, and enabled LDAP automation for user roles. These efforts improved testing velocity, security posture, and automation capabilities across three repositories: ministryofjustice/modernisation-platform, ministryofjustice/modernisation-platform-environments, and ministryofjustice/hmpps-delius-operational-automation. Highlights include inter-environment networking enabling connectivity between hmpps-test, delius-test, Delius development, and AP; security group tightening for Oracle DB ports; metadata-driven SSH key governance; and addition of a DB_CONNECTION_STRING secret to support LDAP workflows.

June 2025

3 Commits • 1 Features

Jun 1, 2025

June 2025 monthly summary for ministryofjustice/modernisation-platform-environments: Delivered environment-scoped AWS Backup IAM role with conditional provisioning and moved role into the environment-specific module, including backup, restore, and KMS access policies. Also fixed IAM policy to reference the generic AWSBackupDefaultServiceRole for the Oracle DB shared component, correcting naming and alignment with existing conventions.

May 2025

18 Commits • 3 Features

May 1, 2025

May 2025 monthly summary: Delivered critical infrastructure and governance improvements across the modernisation-platform-environments repository, focusing on Alfresco infrastructure, AWS Backup role management, Bastion access, and Terraform hygiene. Achievements reduced security risk, strengthened disaster recovery readiness, and improved developer access controls, while delivering measurable business value.

April 2025

12 Commits • 5 Features

Apr 1, 2025

April 2025 performance summary: Delivered stability, security, and automation enhancements across hmpps-delius-operational-automation, modernisation-platform, and modernisation-platform-environments. Key deliverables include LDAP memory allocation fix to resolve performance and stability issues; IAM policy updates enabling pass-through for AWS Backup and DataSync; enabling EFS DataSync connectivity; ALB access control tightening and rule prioritization; and SSM auto-patching management updates. These changes improved reliability, security posture, data protection, and CI/CD automation across the platform.

March 2025

2 Commits • 1 Features

Mar 1, 2025

2025-03 Monthly Summary for ministryofjustice/hmpps-delius-operational-automation: Focused on expanding LDAP workflow environments and enhancing deployment safety. Implemented preprod and prod environments for LDAP workflows to enable broader testing and safer releases, and standardized environment naming by appending '-preapproved' to LDAP-related job environments. Notable changes are captured in two commits: af17a5dfeb059b6a1be364a53b86da6d073f7ea3 ('Tm 1139 preprod ldap workflows (#554)') and 3090f52597d2339225620782c2ec765015918ea2 ('Move LDAP workflows to preapproved env (#557)'). Overall impact: improved release governance, faster validation, and reduced risk in production deployments.

February 2025

14 Commits • 5 Features

Feb 1, 2025

February 2025 monthly summary: This month delivered security hardening, improved observability, and environment parity across two repositories, driving safer production operations, faster incident response, and clearer governance. Key features delivered: - Remove Nextcloud integration from DELIUS core (ministryofjustice/modernisation-platform-environments). De-provisioned Nextcloud component and removed reference from LDAP secrets configuration. Commit: 9f0cc3fb0e1cced0849827642ee0c853ad214a3e. - EC2 status-check monitoring enhancements: introduced clearer instance status alarms and rules, refactored metrics wiring, and updated logging and permissions to support robust EventBridge-based routing. Commits include: ab61a39c2046185b48d0fee4f5a02e143956aaee; f3770f96af5e8fcf52285299e7b157a6b791ab15; 0efd775edbf6a5977397052e57eac25669e3ad90; 4e61358f7de39a604f0c16b14c4c05e07ec986c9; f670ff6727e9bad02a2523b398a029e3d8451782; 1bf3d292cc4c7832f1b20093d275434b646b0b03. - Terraform environment configuration consistency across stages: ensured missing database name/port variables are present in preproduction, stage, and test to align with production; cleaned up an unused Terraform line. Commits: 004f6ae74e2df4ddfe4d5a5a5e3684b2c7161ea5; 35f432725bd69942e8c6f1a7b0fe56666e5fe92a. - IAM policy provisioning and cleanup for delius-core/mis environments: introduced new IAM policies for DELIUS core services and removed unused policies to streamline access control. Commits: d19d089132661292bc14d097056c7982f6f287b6; c8d7171c591275a9e642121f1c62faa6f7c6283f. - Unilink Collaboration and Access Control Overhaul: added collaborator management in Unilink and tightened production access controls to disable or restrict permissions in production. Commits: 48cb64c2cfbda2025566de87f0bbff4593ec95a8; b680eee9774cf4b6fbe11795701898b9d0496cf3. Major bugs fixed: - CloudWatch log policy fix for metrics ingestion: corrected CloudWatch log resource policy to allow EventBridge and log delivery services to write to the log group, ensuring reliable metrics ingestion. Commit: 67b91db6d90a78735c4a5d232aaca8b1c94ebfee. Overall impact and accomplishments: - Reduced blast radius and simplified security posture by removing Nextcloud integration in DELIUS core and tightening Unilink production access. - Strengthened observability and reliability with enhanced EC2 status checks and refined EventBridge and logging configurations. - Achieved environment parity across preproduction, stage, test, and production, reducing deployment drift and manual remediation. - Streamlined access control and secrets/parameter management through targeted IAM policy updates. Technologies/skills demonstrated: - AWS IAM, CloudWatch, EventBridge, SNS, and CloudWatch logs - EC2 status-check monitoring and alerting - Terraform IaC practices and multi-environment configuration - Secrets management, SSM parameters, and cross-service permissions - Collaboration governance and access control design

January 2025

11 Commits • 3 Features

Jan 1, 2025

January 2025 monthly summary for ministryofjustice/modernisation-platform-environments. Focused on delivering compliant offboarding, reliability improvements, enhanced observability, and network provisioning accuracy across environments. The work reinforces platform security, reduces deployment risk, and improves operator efficiency.

Activity

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Quality Metrics

Correctness91.4%
Maintainability89.8%
Architecture88.8%
Performance86.0%
AI Usage21.0%

Skills & Technologies

Programming Languages

BashHCLJSONPythonShellTerraformYAML

Technical Skills

API DevelopmentAWSAWS IAMAccess ControlAccess ManagementBackend DevelopmentCI/CDCloudCloud ComputingCloud DeploymentCloud EngineeringCloud InfrastructureCloud Infrastructure ManagementCloud SecurityCloud Services

Repositories Contributed To

6 repos

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

ministryofjustice/modernisation-platform-environments

Jan 2025 Jul 2026
14 Months active

Languages Used

HCLTerraformShellPython

Technical Skills

AWSCloud ComputingCloud InfrastructureDevOpsInfrastructure as CodeLogging

ministryofjustice/modernisation-platform

Feb 2025 Jul 2026
8 Months active

Languages Used

HCLPythonTerraformShellYAMLJSON

Technical Skills

API DevelopmentBackend DevelopmentDevOpsInfrastructure as CodeSecurity ConfigurationAWS

ministryofjustice/cloud-platform-environments

Feb 2026 Feb 2026
1 Month active

Languages Used

HCL

Technical Skills

AWSCloud ServicesIAM PoliciesInfrastructure as CodeTerraform

ministryofjustice/hmpps-delius-operational-automation

Mar 2025 Apr 2026
5 Months active

Languages Used

YAMLBashJSON

Technical Skills

CI/CDDevOpsGitHub ActionsWorkflow AutomationAWSDatabase Management

ministryofjustice/modernisation-platform-terraform-ecs-cluster

Mar 2026 May 2026
3 Months active

Languages Used

BashHCLTerraformYAML

Technical Skills

AWSDevOpsGitHub ActionsInfrastructure as CodeTerraform

ministryofjustice/hmpps-env-configs

Apr 2026 May 2026
2 Months active

Languages Used

HCL

Technical Skills

Cloud DeploymentInfrastructure as CodeTerraformAWS