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Thomas Cederholm

PROFILE

Thomas Cederholm

Thomas Cederholm developed and maintained CI/CD automation and security tooling across the extenda/actions, extenda/shared-workflows, and extenda/hiiretail-json-schema-registry repositories. He built a GitHub Action for automated ZAP API security scanning, integrating it into CI pipelines to improve vulnerability detection and reduce manual testing. Using YAML, JavaScript, and Docker, Thomas enhanced security rule reporting, streamlined dependency management, and updated workflow components for better reliability and maintainability. He also contributed to data modeling by evolving JSON schema definitions to improve data integrity and compliance. His work demonstrated depth in DevOps, configuration management, and schema development, addressing both security and operational efficiency.

Overall Statistics

Feature vs Bugs

80%Features

Repository Contributions

11Total
Bugs
2
Commits
11
Features
8
Lines of code
1,948
Activity Months7

Work History

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025: Delivered CI/CD workflow improvements in the extenda/shared-workflows repository by upgrading GitHub Actions dependencies to the latest stable versions for actions/checkout and actions/setup-java. This enhances security, features, and performance across the shared workflow definitions and reduces maintenance overhead.

July 2025

1 Commits

Jul 1, 2025

July 2025: Delivered a targeted data-model fix in extenda/hiiretail-json-schema-registry to include the BSI ID in fiscal workstation events, addressing data completeness and improving fiscal processing accuracy. The change is captured in commit 27f94ba6bf7d704438de01f758cbd94045eccf26 (PR #258). This work enhances data quality across downstream reconciliation, reporting accuracy, and compliance readiness. No new features shipped this month; the focus was on reliability, data integrity, and risk reduction in fiscal workflows using JSON schema registry improvements.

May 2025

3 Commits • 2 Features

May 1, 2025

Concise monthly summary for 2025-05 focusing on key contributions, business impact, and skills demonstrated across two repositories (extenda/actions and extenda/hiiretail-json-schema-registry).

April 2025

2 Commits • 2 Features

Apr 1, 2025

April 2025 monthly summary focusing on deliverables across two repos (extenda/shared-workflows and extenda/actions). The month emphasizes CI flexibility, dependency maintenance, and cross-repo consistency to improve speed, security, and maintainability while preserving business value.

February 2025

2 Commits • 1 Features

Feb 1, 2025

February 2025: Updated ZAP CI Action to the latest stable release and tuned rules to suppress non-critical alerts, reducing noise and improving CI reliability for the security pipeline. The changes enhance signal quality for security feedback and streamline triage in the CI workflow.

November 2024

1 Commits • 1 Features

Nov 1, 2024

Monthly summary for 2024-11 focusing on the extenda/actions repository. Delivered security rule reporting enhancements to improve visibility of ZAP findings and introduced a new INFO-level rule. This work reinforces risk visibility, triage efficiency, and governance around security findings.

October 2024

1 Commits • 1 Features

Oct 1, 2024

Month: 2024-10 — Focused on delivering automated API security testing via a new CI/CD GitHub Action for ZAP API Scanning in extenda/actions. Implemented the action with configuration, README, and a default rules file, enabling seamless integration into CI pipelines to scan APIs for vulnerabilities. Included a bug fix (issue #982) to ensure correct action addition and reliability. This work improves security posture and accelerates vulnerability detection within downstream workflows.

Activity

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Quality Metrics

Correctness88.2%
Maintainability92.8%
Architecture85.4%
Performance89.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

DockerfileJSONJavaScriptMarkdownN/ATSVYAMLbashmdyaml

Technical Skills

API SecurityCI/CDConfiguration ManagementData ModelingDependency ManagementDevOpsDockerGitHub ActionsSchema DefinitionSchema DevelopmentSecurity ConfigurationSecurity ScanningWeb Application Security

Repositories Contributed To

3 repos

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

extenda/actions

Oct 2024 May 2025
5 Months active

Languages Used

bashmdyamlN/ATSVYAMLJavaScriptDockerfile

Technical Skills

API SecurityCI/CDDevOpsGitHub ActionsSecurity ConfigurationConfiguration Management

extenda/shared-workflows

Apr 2025 Sep 2025
2 Months active

Languages Used

YAML

Technical Skills

CI/CDGitHub Actions

extenda/hiiretail-json-schema-registry

May 2025 Jul 2025
2 Months active

Languages Used

JSON

Technical Skills

Data ModelingSchema DefinitionSchema Development

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