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Tomáš Hozza

PROFILE

Tomáš Hozza

Over the past 19 months, this developer delivered robust cloud image build and deployment features across the osbuild, osbuild-composer, major/images, and image-builder repositories. They engineered modular APIs and data models for dependency resolution, multi-stage RPM workflows, and cloud integrations, using Go and Python to streamline backend logic and CI/CD pipelines. Their work included refactoring solver APIs, enhancing error handling, and expanding test coverage for multi-tenancy and cross-distro scenarios. By modernizing infrastructure, automating release processes, and integrating AWS, GCP, and OCI support, they improved reliability, upgrade readiness, and developer velocity for large-scale Linux image building and provisioning workflows.

Overall Statistics

Feature vs Bugs

79%Features

Repository Contributions

594Total
Bugs
54
Commits
594
Features
205
Lines of code
1,333,235
Activity Months19

Work History

April 2026

25 Commits • 15 Features

Apr 1, 2026

April 2026: Stability, correctness, and deployment flexibility improvements across worker, boot flows, and Cloud API, with a strong emphasis on observability and end-to-end validation. The work enhances metrics accuracy, manifest/version consistency, and remote container support for Bootc, enabling safer builds across server versions and more flexible deployment scenarios.

March 2026

37 Commits • 10 Features

Mar 1, 2026

March 2026 monthly summary for osbuild projects focused on major architectural refactors and reliability improvements across Bootc workflows, container resolution, and pipeline orchestration. Delivered a BootC-enabled Cloud API v2, migrated container resolution to pipeline-aware results, expanded tenancy support for boot flows, and strengthened CI/testing and release automation. Also modernized dependencies and testing infrastructure to support scalable, multi-tenant builds and faster iteration.

February 2026

22 Commits • 5 Features

Feb 1, 2026

February 2026 monthly summary for osbuild/osbuild-composer and osbuild. Focus areas included stabilizing CI, upgrading image-building dependencies, and expanding modular, data-rich manifest generation to support future upgrades and multi-stage RPM workflows. Key achievements delivered across both repositories: - CI stability and reliability improvements in osbuild-composer: pinned image-builder to a COPR version via Schutzfile, temporarily disabled a failing API image-builder manifest test, and upgraded to the latest RHEL-9 GA base image for more reliable CI. - OSBuild/images dependency upgrade enabling multi-stage RPM installation: upgraded osbuild/images to v0.238.0 to enable multi-stage RPM installs and switch to Transactions for management, improving reliability and compatibility with older composer servers. - DepsolveJobResult enrichment and manifest serialization enhancements: introduced DTOs for rpmmd.RepoConfig and modularity-related structs; added Modules, Transactions, and Solver fields; added helper conversions and tests to strengthen manifest generation and reduce coupling. - Modularity and data flow improvements: added Transactions and Solver to the depsolve result, enabling more accurate and auditable package-resolution data, with JSON roundtrip tests and cloudapi mock updates to cover new fields. - RHEL upgrade tooling improvements: enhanced repository override generation for upgrades, fixed GPG key assignments, and improved logging to aid debugging during upgrade workflows. - Packaging/build stability fixes in osbuild/osbuild: addressed CentOS/RHEL build exclusions, flaky RPM tests, and initrd packaging conflicts; ensured consistent versioning across main and initrd sub-packages and excluded initrd from main package to prevent downgrade conflicts. - RPM build tooling and CI enhancements: added dynamic tarball download in Makefile, introduced rpm-mock targets to simulate builds, and updated CI for RHEL 9.x GA and 9.x nightly testing to broaden coverage. Business value and impact: - Reduced CI flakiness, enabling faster feedback and more reliable image builds for downstream deployments. - Improved build reliability and compatibility across older and newer OS versions, easing upgrade paths for customers. - Richer, modular data in depsolve results improves observability, troubleshooting, and future upgrade readiness. - Demonstrated strong cross-team collaboration by aligning worker-server data models with API contracts and enhancing test coverage.

January 2026

2 Commits • 1 Features

Jan 1, 2026

January 2026: Key codebase hygiene and dependency-management improvements across osbuild and osbuild-composer. Delivered two high-impact changes that improve stability, upgrade readiness, and migration flexibility. Key outcomes include eliminating circular import dependencies in the osbuild solver API and enabling V2 depsolver API support in osbuild-composer with version bumps and API-version migration flexibility.

December 2025

29 Commits • 6 Features

Dec 1, 2025

December 2025 delivered substantial RHSM and API groundwork across osbuild and its solver, with an emphasis on business value, reliability, and future compatibility. Key features include RHSM integration and secrets discovery across the repository, consolidation of API data models, and preparing V2 API tooling for depsolve. Also enhanced code quality, static typing, and CI infrastructure to support faster, safer releases.

November 2025

47 Commits • 28 Features

Nov 1, 2025

November 2025 focused on establishing a robust, versioned Solver API surface, decoupling solver logic from external API formats, and strengthening test coverage and CI pipelines. Key work included integrating a versioned Solver API with request data classes, serializers, and DNF/DNF5 transformations, plus introducing a V1 parser and a V2 API that exposes complete package metadata. The effort also hardened error handling in the depsolve path and expanded automated tests, including parity and integration tests, to ensure consistent behavior across solver implementations and API versions.

October 2025

22 Commits • 9 Features

Oct 1, 2025

October 2025 (2025-10) monthly overview for osbuild/osbuild-composer. Delivered notable Cloud API enhancements with improved manifest error handling and ComposeManifest reliability, expanded test coverage for the ComposeManifests API and multi-tenancy, and strengthened visibility through test scaffolding. Implemented infrastructure updates including Terraform tooling and Podman CNI workflow adjustments. Refactored and aligned Depsolve API surface: dropped rpmmd.PackageSpec from public API, introduced EVRA accessors, and decoupled package lists from DepsolveJobResult. Ported code paths to unified rpmmd.Package, and maintained alignment with upstream osbuild/images. Strengthened CI with nightly tests on RHEL 9.8/10.2 and improved test utilities and mocks. Business value centers on reliability, faster feedback loops, and smoother upgrade paths in multi-tenant cloud builds, with tangible improvements in error reporting, test coverage, and upstream compatibility.

September 2025

62 Commits • 26 Features

Sep 1, 2025

Concise monthly summary for 2025-09 focused on delivering business value and technical excellence across the major repositories. The month centered on expanding platform support, stabilizing the build/test pipeline, and modernizing test infrastructure to enable faster, more reliable releases for our cloud image products.

August 2025

60 Commits • 19 Features

Aug 1, 2025

August 2025 monthly summary: Focused on stabilizing cloud integrations, reducing maintenance overhead, and improving developer velocity by aligning AWS, OCI, and GCP work with osbuild/images. Key features delivered include API refinements and data-model simplifications that streamline AWS operations, and broad migrations to a unified images surface for cloud providers, with automated testing and build hygiene improvements.

July 2025

29 Commits • 6 Features

Jul 1, 2025

July 2025: Highlights include the Koji upload integration and refactor across major/images and osbuild-composer, AWS SDK v2 migration with comprehensive cloud tests, and build/pipeline enhancements that improve reliability and telemetry. Also expanded RHSM metrics for CLI usage and strengthened CI/CD practices for stability and compliance across releases.

June 2025

25 Commits • 7 Features

Jun 1, 2025

June 2025 monthly summary focusing on key achievements, business value and technical accomplishments across major/images, osbuild/image-builder, osbuild/osbuild-composer, and osbuildhub.io.git. The work delivered strengthens deployment reliability, accelerates release cycles, enhances security, and improves documentation.

May 2025

26 Commits • 6 Features

May 1, 2025

May 2025 performance summary: Delivered core features across osbuild/osbuild, osbuild/image-builder, major/images, and osbuild-composer with a focus on encoding, SBOM visibility, API reliability, and image provisioning. Key outcomes include inline source encoding enhancements with tests, SBOM retrieval for composes, a generic pagination framework with cross-endpoint correctness, unified size parsing for JSON mappings, and Packer image base updates (Fedora 42 and RHEL 9.6). Also cleaned CI for RPM compatibility and enhanced RPM test coverage.

April 2025

26 Commits • 10 Features

Apr 1, 2025

Concise monthly summary for 2025-04 focusing on concrete deliveries, business value, and technical excellence across repositories osbuild/osbuild, osbuild/osbuild-composer, major/images, and osbuildhub.io.git.

March 2025

14 Commits • 5 Features

Mar 1, 2025

March 2025 monthly summary focusing on key accomplishments across two repositories (major/images and osbuild/osbuild-composer). Delivered cross-distro image build compatibility, strengthened test reliability for multi-distro scenarios, and refreshed CI/dependency pipelines to align with current distro lifecycles. Business value centers on faster, more reliable, cross-distro image creation and reduced maintenance overhead through streamlined tests and CI. Technical achievements include cryptographic policy alignment and GPG key upgrades, test harness refinements, container runtime improvements, and infrastructure updates.

February 2025

38 Commits • 15 Features

Feb 1, 2025

February 2025 monthly highlights across the OS build workflow (osbuild/osbuild, osbuild/osbuild-composer, major/images, and governance tooling). Focused on reliability, cloud/OSS readiness, and developer velocity by hardening error handling, improving data parsing and tests, expanding OS support, and tightening governance. Key items included fixes to error handling in Schutzfile, enhancement of image-info utilities with robust line handling and tests, dependencies solving improvements, OS-version coverage updates for RHEL 9.7/10.1, and governance/automation improvements that streamline reviews and project health.

January 2025

59 Commits • 9 Features

Jan 1, 2025

January 2025 monthly summary focused on delivering traceable build information, stabilizing CI/test pipelines, and enabling distro-ready testing across major/images, osbuild/osbuild, and osbuild/osbuild-composer. The month concentrated on building robust build-info tooling, cross-distro dependency synchronization, and enhancing infrastructure reliability to accelerate feedback and business value.

December 2024

31 Commits • 12 Features

Dec 1, 2024

December 2024: Delivered core image-building enhancements, stabilized OSTree workflows, and expanded SBOM/SPDX capabilities across the OSBuild ecosystem. Consolidated testing utilities and introduced a new osbuild-image-info tool to improve maintainability, packaging, and tooling. Achieved upgrade stability with non-Beta repos and improved reuse of image-info utilities through centralized typing. Business value: more reliable image builds, better compliance, and reduced maintenance effort.

November 2024

39 Commits • 15 Features

Nov 1, 2024

November 2024 monthly summary focusing on reliability, security/compliance, and cloud-ready image capabilities across the osbuild, composer, and major/images repositories. Key outcomes include improved test environment fidelity with RHEL-9.6 testing repository configuration, expanded DNF5 tooling and SBOM support, and robust RHEL-10 Azure image expansions. Additionally, OSTree option validation was implemented with tests, and code quality improvements advanced Python 3.13 compatibility and lint hygiene. These efforts deliver measurable business value through more reliable tests, tighter SBOM/compliance controls, and maintainable, cloud-ready image pipelines.

September 2024

1 Commits • 1 Features

Sep 1, 2024

2024-09 monthly summary for major/images: Implemented a dedicated error type to handle empty repository configurations and integrated it into the repository loading flow to improve reliability, feedback, and triage when no repos are configured.

Activity

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Quality Metrics

Correctness95.6%
Maintainability93.4%
Architecture92.6%
Performance90.4%
AI Usage21.2%

Skills & Technologies

Programming Languages

BashDockerfileGoHCLINIJSONJavaScriptMakeMakefileMarkdown

Technical Skills

API DesignAPI DevelopmentAPI IntegrationAPI TestingAPI designAPI developmentAWSAWS CLIAWS S3AWS SDKAnsibleArgument ParsingAzureBackend DevelopmentBackward Compatibility

Repositories Contributed To

5 repos

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

osbuild/osbuild-composer

Nov 2024 Apr 2026
17 Months active

Languages Used

JSONGoShellTOMLYAMLMakefileSpecfileMarkdown

Technical Skills

Configuration ManagementTestingAPI DevelopmentBackend DevelopmentDependency ManagementGo Development

osbuild/osbuild

Nov 2024 Mar 2026
12 Months active

Languages Used

INIJSONPythonYAMLpythonyamlMarkdownShell

Technical Skills

Bug FixingBuild SystemsCI/CDCode AnalysisCode LintingCode Maintenance

major/images

Sep 2024 Sep 2025
12 Months active

Languages Used

GoPythonJSONShellYAMLyamlMakefileMarkdown

Technical Skills

Go programmingerror handlingsoftware developmentAzureBackend DevelopmentBuild Systems

osbuild/image-builder

May 2025 Sep 2025
3 Months active

Languages Used

GoJSONJavaScriptShellYAMLPython

Technical Skills

API DesignAPI DevelopmentAPI TestingBackend DevelopmentGoJSON Processing

osbuild/osbuildhub.io.git

Feb 2025 Mar 2026
4 Months active

Languages Used

MarkdownJavaScriptPythonShellYAML

Technical Skills

DocumentationCI/CDCLI DevelopmentCode RefactoringContainerizationDependency Management