EXCEEDS logo
Exceeds
Markus Thömmes

PROFILE

Markus Thömmes

Over four months, contributed to Chainguard’s Terraform and release tooling by building and enhancing data sources, release workflows, and reliability features across multiple repositories. Developed new Terraform provider data sources in Go, adding support for querying image repositories with advanced filtering and debugging, while updating documentation and schemas for clarity. Improved cloud event ingestion in terraform-infra-common by implementing robust retry logic and safer file operations. In chainguard-images/images, enabled dynamic active tag publishing through Makefile and CI/CD enhancements. Addressed critical bugs in build systems and conflict resolution, applying skills in Go, Terraform, and infrastructure as code to improve stability and release velocity.

Overall Statistics

Feature vs Bugs

57%Features

Repository Contributions

8Total
Bugs
3
Commits
8
Features
4
Lines of code
758
Activity Months4

Work History

September 2025

2 Commits • 1 Features

Sep 1, 2025

September 2025: Delivered two changes with direct business value across Chainguard repos that boost release velocity and attestation integrity. Implemented Active Tag Publishing in the chainguard-images/images release workflow with a new make target for enabling active tag updates and an override file added to gitignore to support dynamic tag publishing during releases. Fixed a critical bug in chainguard-dev/terraform-provider-cosign by changing the default conflict resolution to SKIPSAME for both attest and sign, ensuring attestations are replaced rather than appended and preventing incorrect attestations. Commit references map to key changes: 60e9477791fdd9634f1ecc7157b4271e10d6ec63 (Enable active_tags publishing (#3015)) and dd0d7a8fe6a4b5444e11705233410d7f7ffce31d (Change default conflict mode to "SKIPSAME" (#393)).

August 2025

4 Commits • 3 Features

Aug 1, 2025

In August 2025, delivered significant data-source enhancements for the Chainguard Terraform provider, improving image repository queries, debugging, and multi-repo access. Implemented active_tags plumbing in image_repo data source, added debugging InputParams, introduced aliases for chainguard_image_repo, and launched chainguard_image_repos data source with optional filters. Updated docs and usage examples, improving developer experience and reducing toil for operators.

July 2025

1 Commits

Jul 1, 2025

2025-07 monthly summary: Reinstated apkofs.DirFS across melange build, tests, license checks, and linting to restore stability after reverting a previous change to os.DirFS. This stabilized CI, fixed build/test failures, and preserved tooling compatibility, enabling reliable shipping.

June 2025

1 Commits

Jun 1, 2025

June 2025: Reliability-focused improvements for Cloud Events ingestion in chainguard-dev/terraform-infra-common. Implemented a robust retry across the full upload lifecycle and adjusted deletion semantics to occur only after a successful close, reducing risk of state loss and orphaned files.

Activity

Loading activity data...

Quality Metrics

Correctness91.2%
Maintainability92.6%
Architecture90.0%
Performance82.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

GoMakefileMarkdownTerraformYAML

Technical Skills

API IntegrationBuild SystemsCI/CDCloud InfrastructureCloud StorageData Source ImplementationDebuggingDevOpsDocumentationError HandlingFile OperationsFile System OperationsGoGo DevelopmentGo Programming

Repositories Contributed To

5 repos

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

chainguard-dev/terraform-provider-chainguard

Aug 2025 Aug 2025
1 Month active

Languages Used

GoMarkdownTerraform

Technical Skills

API IntegrationCloud InfrastructureData Source ImplementationDebuggingDocumentationGo

chainguard-dev/terraform-infra-common

Jun 2025 Jun 2025
1 Month active

Languages Used

Go

Technical Skills

Cloud StorageError HandlingFile OperationsRetry Logic

chainguard-dev/melange

Jul 2025 Jul 2025
1 Month active

Languages Used

Go

Technical Skills

Build SystemsFile System OperationsGo Development

chainguard-images/images

Sep 2025 Sep 2025
1 Month active

Languages Used

MakefileYAML

Technical Skills

CI/CDInfrastructure as Code

chainguard-dev/terraform-provider-cosign

Sep 2025 Sep 2025
1 Month active

Languages Used

Go

Technical Skills

DevOpsGoTerraform