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Duncan Garmonsway

PROFILE

Duncan Garmonsway

Over the past 19 months, this developer delivered robust backend and data engineering solutions across multiple GOV.UK repositories, including alphagov/govuk-knowledge-graph-gcp and alphagov/publishing-api. They built scalable data ingestion pipelines, enhanced analytics with BigQuery and SQL, and improved API reliability through GraphQL and Ruby on Rails. Their work included automating privacy controls with Data Loss Prevention, optimizing cloud infrastructure using Terraform and Docker, and strengthening CI/CD workflows with GitHub Actions. By focusing on maintainable code, security best practices, and detailed documentation, they enabled faster, more reliable content delivery and analytics, supporting both operational resilience and data-driven decision making.

Overall Statistics

Feature vs Bugs

72%Features

Repository Contributions

121Total
Bugs
18
Commits
121
Features
47
Lines of code
41,884
Activity Months19

Work History

June 2026

3 Commits • 1 Features

Jun 1, 2026

Month 2026-06 — alphagov/asset-manager: Delivered reliability improvements to the Virus Scanning System, streamlined background processing by removing deprecated Sidekiq code, and expanded test coverage for SVG scanning. This release focuses on robustness, maintainability, and clear ownership of asset-state transitions.

May 2026

2 Commits • 1 Features

May 1, 2026

May 2026 monthly summary for alphagov/asset-manager: Delivered a dedicated SVG Scanning Feature with background processing and integrated it into the existing virus-scanning workflow. The effort emphasizes security, test coverage, and alignment with the asset state machine to ensure SVG assets are validated before progressing through the lifecycle.

April 2026

7 Commits • 3 Features

Apr 1, 2026

April 2026 performance summary: Delivered critical platform upgrades and reliability improvements across support, signon, and govuk-developer-docs. Key outcomes include a Rails 8.1 upgrade with new defaults that enhance logging, security, and performance; a new Fact Check Manager option in Technical Fault Reports; a targeted fix to stabilize email change tests; and Kubernetes deployment and secret management enhancements with improved rolling restart guidance and a single force-sync for secrets. Documentation and tests improvements reduced CI flakiness and operational complexity, supporting faster release cycles and stronger security posture.

March 2026

2 Commits • 2 Features

Mar 1, 2026

March 2026 monthly summary focusing on security, compatibility, and regulatory accuracy across alphagov/govspeak and alphagov/smart-answers. Delivered a critical dependency upgrade for security and compatibility, and implemented the 2026 State Pension uprating with added tests, reducing risk and improving customer-facing reliability.

February 2026

3 Commits • 1 Features

Feb 1, 2026

February 2026: Increased API reliability and upgrade readiness by delivering targeted tests and dependency fixes. In alphagov/publishing-api, added Link Expansion Inclusion Tests (Direct and Reverse) to validate inclusion rules for link expansion in GraphQL and Content Store responses, establishing robust coverage for simple cases and laying groundwork for precedence handling in more complex scenarios. In alphagov/signon, resolved a Rails 8.0.x compatibility issue by pinning minitest to a compatible version, preventing argument errors and ensuring smoother Rails upgrade paths.

January 2026

4 Commits • 1 Features

Jan 1, 2026

January 2026 achievements for alphagov/publishing-api focused on improving world location link handling by introducing a bulk, batched processing workflow via a Rails rake task. The work enhances downstream processing efficiency without impacting priority tasks, improves maintainability by moving the script into lib/tasks, and reduces technical debt by removing an obsolete temporary rake task. These changes deliver faster, safer republishing of world location links and clearer task ownership.

December 2025

7 Commits • 4 Features

Dec 1, 2025

December 2025 monthly performance summary for the publishing platform. Focused on delivering reliable content delivery, accessible UI components, and data surface improvements across two repos: alphagov/publishing-api and alphagov/govuk_publishing_components. Key work centered on hardening frontend diff processing, expanding GraphQL query capabilities, and introducing Content API support scripts, alongside a UX/accessibility-focused component release.

November 2025

23 Commits • 2 Features

Nov 1, 2025

November 2025 was focused on delivering richer data access, improving performance, and hardening security and stability across repos. Key work included expanding the GraphQL API in publishing-api, performance tuning via indexing, robust data processing, and targeted maintenance fixes across supporting services. The work enabled faster, more accurate content retrieval for clients, reduced risk from dependencies, and a more stable deployment path.

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary focusing on key accomplishments in the govuk-developer-docs repository. The month centered on enhancing developer experience through clear, actionable documentation for site transition aliasing and its operational guidance.

September 2025

2 Commits • 1 Features

Sep 1, 2025

Monthly work summary for 2025-09 focusing on the delivery of scalable evaluation data storage for Search API v2 on alphagov/govuk-infrastructure. Implemented a BigQuery-based solution to store Vertex AI evaluation outputs, enabling fast analytics on evaluation results. Added a data source correction to ensure evaluation data is sourced from the vais_evaluation_output bucket. The work includes Hive-partitioned JSON data in GCS to optimize query performance and cost.

August 2025

5 Commits • 3 Features

Aug 1, 2025

August 2025: Delivered data freshness improvements and infrastructure enablement across knowledge graph and infra repos. Focused on Zendesk data ingestion, documentation clarifications, and PostgreSQL upgrade to fix data load issues, with groundwork for downstream analytics via storage permissions and related tasks.

July 2025

11 Commits • 6 Features

Jul 1, 2025

July 2025 summary focused on data reliability, governance, and scalable analytics across two repos. What was delivered strengthened cost controls, deployment safety, and analytics readiness, with clear business value across data processing, ticket analytics, and evaluation workloads.

June 2025

7 Commits • 3 Features

Jun 1, 2025

Month: 2025-06. Focused on delivering scalable data ingestion for Zendesk tickets into BigQuery, stabilizing deployment infra, and enabling automated GA4-based evaluation pipelines. Achievements include a consolidated Zendesk tickets ingestion path with partitioning, cross-environment data access improvements, removal of deprecated datasets, and the addition of a binary GA4 clickstream table for automated evaluation. Clear Terraform provisioning and idempotent operations underpinned repeatable, reliable deployments, reinforcing data reliability and faster business insights.

May 2025

11 Commits • 3 Features

May 1, 2025

In May 2025, the team delivered substantial business value for the alphagov/govuk-knowledge-graph-gcp project by enhancing analytics capabilities, enabling granular API data retrieval, strengthening data protection, and hardening deployment security. The work spans data-model enrichments for publisher content, flexible API responses, robust PII processing, and security/maintenance improvements that collectively improve data quality, operational resilience, and data-driven decision making for publisher analytics and knowledge-graph workflows.

April 2025

5 Commits • 4 Features

Apr 1, 2025

April 2025 performance summary for alphagov/govuk-knowledge-graph-gcp. This month delivered end-to-end data ingestion, privacy, and access-control improvements that enable scalable analytics, stronger governance, and faster delivery of insights. Despite no major bug reports in the period, the work achieved notable business value through automated data flows, safer data processing, and streamlined access for analytical teams.

March 2025

9 Commits • 4 Features

Mar 1, 2025

Concise monthly summary for 2025-03 focusing on key accomplishments for alphagov/govuk-knowledge-graph-gcp, including delivered features, fixed issues, and overall impact with traceable commits.

February 2025

16 Commits • 4 Features

Feb 1, 2025

February 2025 monthly summary for alphagov/govuk-knowledge-graph-gcp focusing on infrastructure, data analytics, and CI/CD reliability. Highlighted achievements center on stabilizing deployments, migrating critical rendering workloads to Cloud Run for easier testing, expanding analytics pipelines with BigQuery, and tightening data quality and CI processes.

January 2025

2 Commits • 2 Features

Jan 1, 2025

January 2025 monthly summary focusing on key accomplishments across two repos: alphagov/govuk-knowledge-graph-gcp and alphagov/govuk-infrastructure. The work delivered targeted cleanups and workflow improvements that reduce maintenance overhead, strengthen governance, and accelerate delivery. Notable outcomes include architectural alignment with Vertex AI, reduction of technical debt, and improved PR processing efficiency. Demonstrated proficiency with cloud-native tooling and CI/CD practices including Vertex AI, Terraform, Docker, and GitHub Actions.

October 2024

1 Commits • 1 Features

Oct 1, 2024

October 2024 monthly summary for alphagov/govuk-knowledge-graph-gcp highlighting the Page-Views analytics optimization work and its business impact.

Activity

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Quality Metrics

Correctness95.2%
Maintainability90.8%
Architecture93.2%
Performance87.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

DockerfileGraphQLHCLJSONJavaScriptJsonnetMarkdownRubySQLShell

Technical Skills

API AuthenticationAPI DevelopmentAPI IntegrationAPI designAPI developmentActiveRecordBackend DevelopmentBigQueryCI/CDCapybaraCloudCloud ArchitectureCloud ComputingCloud DeploymentCloud Engineering

Repositories Contributed To

11 repos

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

alphagov/govuk-knowledge-graph-gcp

Oct 2024 Aug 2025
9 Months active

Languages Used

SQLHCLYAMLDockerfileJSONJavaScriptRubyShell

Technical Skills

BigQueryCost OptimizationData EngineeringSQLCI/CDCloud Run

alphagov/publishing-api

Nov 2025 Feb 2026
4 Months active

Languages Used

GraphQLJSONJsonnetRubySQL

Technical Skills

API DevelopmentAPI designAPI developmentActiveRecordBackend DevelopmentGraphQL

alphagov/govuk-infrastructure

Jan 2025 Sep 2025
5 Months active

Languages Used

YAMLHCL

Technical Skills

DevOpsInfrastructure as CodeBigQueryCloudTerraformCloud Infrastructure

alphagov/support

Nov 2025 Apr 2026
2 Months active

Languages Used

JavaScriptRuby

Technical Skills

dependency managementsecurity best practicesBackend DevelopmentConfiguration ManagementGem ManagementRails

alphagov/asset-manager

May 2026 Jun 2026
2 Months active

Languages Used

Ruby

Technical Skills

RSpecRuby on RailsSidekiqback end developmenttestingbackend development

alphagov/govuk-developer-docs

Oct 2025 Apr 2026
2 Months active

Languages Used

Markdown

Technical Skills

DocumentationCloud InfrastructureDevOpsKubernetes

alphagov/signon

Nov 2025 Apr 2026
3 Months active

Languages Used

JavaScriptRuby

Technical Skills

JavaScriptdependency managementsecurity updatesRuby on RailsTestingCapybara

alphagov/transition

Nov 2025 Nov 2025
1 Month active

Languages Used

Ruby

Technical Skills

Dependency ManagementRuby on Rails

alphagov/govuk_publishing_components

Dec 2025 Dec 2025
1 Month active

Languages Used

Ruby

Technical Skills

Ruby on Railsfront end development

alphagov/govspeak

Mar 2026 Mar 2026
1 Month active

Languages Used

Ruby

Technical Skills

Dependency ManagementRuby on RailsVersion Control

alphagov/smart-answers

Mar 2026 Mar 2026
1 Month active

Languages Used

RubyYAML

Technical Skills

Ruby on Railsback end developmenttesting