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Cezary Miącz

PROFILE

Cezary Miącz

Over nine months, this developer contributed to the saleor/saleor repository by building and refining backend systems focused on reliability, security, and observability. They implemented features such as cache-based deduplication for webhook delivery, custom Celery broker transport for AWS SQS, and dynamic GitHub token integration for CI/CD workflows. Their technical approach emphasized robust error handling, configuration management, and test coverage, using Python, Django, and YAML. They addressed race conditions, improved metrics tracking, and enhanced documentation to ensure consistent behavior across environments. Their work reduced operational risk, improved deployment automation, and strengthened the security posture of core backend and integration workflows.

Overall Statistics

Feature vs Bugs

62%Features

Repository Contributions

14Total
Bugs
5
Commits
14
Features
8
Lines of code
1,772
Activity Months9

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026: Implemented dynamic GitHub token in deployment workflows for saleor/saleor, replacing legacy SALEOR_RELEASE_TOKEN to strengthen security and CI/CD flexibility. No major bugs documented for this scope. This work improves deployment security, reduces token exposure, and enhances automation reliability, laying groundwork for ephemeral credentials in future releases.

February 2026

1 Commits

Feb 1, 2026

February 2026 monthly summary for saleor/saleor: Delivered a fix to prevent duplicate app installation in quiet mode, with comprehensive unit tests and fixture updates; improved test reliability by replacing VCR cassettes with fixtures. This work ensures automation scripts do not fail when an app is already installed and enhances CI stability.

January 2026

1 Commits • 1 Features

Jan 1, 2026

Month: 2026-01. Focused on tightening security and improving UX for app integration workflows in saleor/saleor. Delivered a quiet mode for app creation and installation commands to suppress authentication token output, and implemented a fix to prevent token leakage when tokens are not needed. These changes reduce exposure risk and strengthen security posture for developer workflows and customer deployments.

December 2025

2 Commits • 1 Features

Dec 1, 2025

December 2025: Delivered targeted improvements across docs and checkout workflows. Updated documentation to clarify that all extensions are disabled during snapshot restore, ensuring consistent behavior across environments and preventing extension-related surprises. Fixed a race condition in the checkout flow by aligning the source object for TransactionEventReport with checkout completion, reducing conflicts during checkout.

November 2025

3 Commits • 1 Features

Nov 1, 2025

November 2025 focused on stabilizing webhook delivery and tightening order state semantics in the saleor/saleor repository. Key outcomes include preventing charging events for draft orders, and enhancing webhook telemetry with unified metrics, attributes, and circuit breaker visibility, driving both correctness and reliability improvements.

October 2025

1 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for saleor/saleor focused on delivering a robust integration improvement for background task processing. Implemented a customized Celery broker transport for Amazon SQS to support fair queue processing. This addresses message grouping and deduplication for FIFO queues and enables passing MessageGroupId for non-FIFO queues, improving compatibility and reliability with SQS backends. No major bug fixes were reported this month; maintenance efforts centered on reliability and performance of the task queue integration.

August 2025

1 Commits

Aug 1, 2025

Month: 2025-08 — Concise monthly summary focusing on key accomplishments and business value for the Saleor project.

March 2025

2 Commits • 1 Features

Mar 1, 2025

March 2025 (saleor/saleor): Focused on reliability hardening and secure defaults. Key outcomes include a bug fix for Webhook Trigger Sync argument handling and the Admin Email Plugin configuration parsing with defaults, supported by targeted tests. These changes improve webhook reliability, reduce misconfiguration risks, and strengthen security posture, enabling safer deployments and smoother admin workflows. Technologies demonstrated include Python, config parsing, unit testing, and security hardening.

November 2024

2 Commits • 2 Features

Nov 1, 2024

November 2024 monthly summary for saleor/saleor: Focused on reducing exposure of development tooling and strengthening test reliability. Key work included implementing noindex, nofollow for the GraphQL Playground to prevent public indexing, and refactoring tests to improve robustness against race conditions. These changes decrease security exposure and lower risk in releases, without introducing customer-visible regressions. This month did not involve major customer-impacting bug fixes, but delivered meaningful improvements in security posture and test stability, enabling faster, safer releases.

Activity

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Quality Metrics

Correctness95.0%
Maintainability85.8%
Architecture84.2%
Performance78.6%
AI Usage21.4%

Skills & Technologies

Programming Languages

HTMLMarkdownPythonYAML

Technical Skills

API IntegrationAWS SQSBackend DevelopmentCachingCeleryConfiguration ManagementContinuous IntegrationDevOpsDjangoError HandlingGitHub ActionsGraphQLKombuMessage QueuesPlugin Development

Repositories Contributed To

2 repos

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

saleor/saleor

Nov 2024 Mar 2026
9 Months active

Languages Used

HTMLPythonYAML

Technical Skills

PythonRefactoringSEOTestingWeb DevelopmentAPI Integration

saleor/saleor-docs

Dec 2025 Dec 2025
1 Month active

Languages Used

Markdown

Technical Skills

documentationtechnical writing