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Erwan Guyader

PROFILE

Erwan Guyader

Over 16 months, this developer delivered robust backend and full stack features across the cozy/cozy-stack and cozy/cozy-client repositories, focusing on collaborative file management, API design, and configuration management. They implemented shared drive support, enhanced error handling, and streamlined premium management workflows, using Go, JavaScript, and Docker to ensure reliability and maintainability. Their work included refactoring for extensibility, introducing concurrency controls, and improving localization and documentation. By aligning infrastructure with modern containerization practices and strengthening data governance, they enabled safer deployments and smoother integrations, demonstrating depth in API development, backend architecture, and cross-service coordination within a multi-tenant SaaS environment.

Overall Statistics

Feature vs Bugs

77%Features

Repository Contributions

37Total
Bugs
7
Commits
37
Features
24
Lines of code
32,492
Activity Months16

Work History

May 2026

1 Commits

May 1, 2026

May 2026 monthly summary for cozy/cozy-stack focused on environment compatibility improvements that stabilize container startup and align dependencies across the stack. Delivered a targeted fix upgrading the base image to Debian Bookworm and CouchDB to 3.3.3, addressing GLIBC version mismatches and downstream startup issues.

March 2026

1 Commits

Mar 1, 2026

Month: 2026-03. Focused on API clarity and consistency for driving directories. Delivered a targeted bug fix to the Files API enabling driveId to be omitted for directories outside shared drives, aligning with the existing behavior for files and reducing client confusion. This improvement enhances response clarity, reduces unnecessary data transfer, and strengthens API contract adherence for directory operations.

February 2026

4 Commits • 2 Features

Feb 1, 2026

February 2026 (2026-02) monthly summary for cozy/cozy-stack focusing on feature delivery, reliability improvements, and architecture-aligned changes that drive business value. Key features delivered: - Error Page UX Enhancements: introduced a configurable support page URL to replace the support email, removed an outdated address link, and updated localization and templates to streamline user experience. Commits: 92d994c3eb2aa20214546942add4764e0f968512; bac889db4d2e10d8eaf00a1cebbc7deeec7d4e45. - RabbitMQ Queue Rename for App Commands: renamed the app installation/uninstallation queue to align with ADR and deployed configuration, improving consistency and reliability in messaging. Commit: 4f72c4415d65b7da5bb0d1d7b98b81689259b268. Major bugs fixed: - Domain Subscription Disk Quota Type Fix: corrected unmarshalling by treating the disk quota as an integer, stabilizing domain subscription updates and improving reliability. Commit: 77ab7ed78d0357c10a2304c32456cf568d64968c. Overall impact and accomplishments: - Improved user experience on error flows, reducing confusion and support friction. - Strengthened reliability and observability of the messaging layer and subscription processing through architecture-aligned queue naming and data handling. - Accelerated SaaS readiness by aligning configurations and templates with current deployment patterns. Technologies/skills demonstrated: - Backend messaging (RabbitMQ) and queue naming conventions - Config-driven UI changes and localization/template updates - JSON/unmarshalling data handling and robustness - ADR-informed architectural decisions and deployment alignment

January 2026

3 Commits • 3 Features

Jan 1, 2026

January 2026: Delivered three organization-aware capabilities for cozy-stack, enhancing multi-tenant isolation, configurability, and third-party data integration. Implemented org-domain based context for instances, dynamic organization plan propagation via messaging, and more flexible slug handling to accommodate SSO data. Included model, creation logic, messaging, and test coverage.

October 2025

2 Commits • 1 Features

Oct 1, 2025

Concise monthly summary for 2025-10 focusing on delivering features and fixing bugs for cozy-stack, with business value and technical achievements.

September 2025

1 Commits • 1 Features

Sep 1, 2025

September 2025 monthly summary for cozy-stack: Delivered a targeted enhancement to Settings by adding a Premium Management Route that redirects authenticated users to their instance's premium management page. Centralizes premium URL construction and instance UUID handling, reducing duplication and improving UX. The route returns a 404 when no premium manager is configured to clearly signal configuration gaps. This work lays the groundwork for streamlined premium workflows across instances and enhances operator visibility into configuration state.

August 2025

5 Commits • 4 Features

Aug 1, 2025

August 2025 focused back-end improvements across cozy-stack and cozy-client, combining usability improvements for shared drives, new retrieval endpoints, and enhanced cross-location file management, plus a critical translation fix in French 2FA emails. The work emphasizes business value (external collaboration, faster asset access, and consistent multi-location handling) and demonstrates solid software craftsmanship in API design, security-conscious feature flags, and comprehensive documentation.

July 2025

2 Commits • 1 Features

Jul 1, 2025

In July 2025, delivered key Shared Drive enhancements in cozy/cozy-stack, focusing on metadata management and versioned file access to improve data governance and recoverability across collaborative spaces. Implemented routes to edit metadata (modification dates, tags) and to rename/move items within the same shared drive, ensuring data integrity. Introduced a dedicated API endpoint to download specific historical versions of files in shared drives, accompanied by documentation. This foundation enables better discoverability, governance, and recoverability for shared data.

June 2025

3 Commits • 2 Features

Jun 1, 2025

June 2025: Delivered key Shared Drives capabilities across cozy-client and cozy-stack, enabling programmatic interaction with shared drive documents, files, directories, and metadata. The work enhances data collaboration, governance, and integration with external drive APIs, while establishing a solid foundation for further Shared Drives features.

May 2025

2 Commits • 2 Features

May 1, 2025

Month: 2025-05. Focused feature delivery and data enrichment in cozy/cozy-stack to streamline sharing workflows and improve data organization. Delivered CLI-based share link creation and enhanced shared-drive data with driveId to improve retrieval in CozyClient, laying groundwork for Twake Drive migration.

April 2025

1 Commits • 1 Features

Apr 1, 2025

April 2025 — Monthly work summary for cozy/cozy-client focused on feature delivery and architectural improvements enabling shared-drive collaboration. Key feature delivered: Shared Drives Support for FileCollection routing. Refactored FileCollection to accept a driveId option and updated routing from /files to /sharings/drives/:driveId, enabling proxied access to files on shared drives and consistent routing across the Cozy ecosystem. Impact: enables collaborative workflows, supports multi-user access to shared data, and lays groundwork for cross-repo shared-drive features. Technologies/skills demonstrated include refactoring for extensibility, drive-scoped API surface design, and proxy-based routing patterns across services. Bug fixes: none reported this month.

February 2025

3 Commits • 2 Features

Feb 1, 2025

February 2025 monthly summary for cozy/cozy-client focusing on robustness, reliability, and safe data operations. Delivered two primary capabilities: 1) consistent error handling in CozyStackClient with a configurable fetch-error policy, and 2) If-Match based concurrency control for FileCollection, enabling conditional requests and preventing conflicting updates. These efforts improved client reliability, debuggability, and data integrity, reducing incident investigation time and enabling safer downstream integrations.

January 2025

1 Commits

Jan 1, 2025

January 2025: Focused on stabilizing the build and dependency management for cozy/cozy-client. Delivered a targeted Parcel upgrade to fix deasync install issues, improving local development, CI reliability, and overall package management. This work reduced flaky installs and set the stage for smoother future upgrades.

December 2024

1 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary for cozy/cozy-stack: Delivered Safe Example Configuration Template by replacing production URLs and emails with generic placeholders to prevent users from copying production endpoints into their own configs. Cleaned up production elements from the example configuration in the commit 148cfd951ba068d71c445b6dad1475c57d14ac58. This work reduces misconfiguration risk, strengthens security posture, and improves onboarding of new users. Overall impact includes safer defaults, improved maintainability, and clear traceability for this change.

November 2024

5 Commits • 2 Features

Nov 1, 2024

Month: 2024-11 — Cozy Stack (cozy/cozy-stack). Focused on improving reliability and partner-facing capabilities through Cloudery integration. Delivered a legal notice URL in Instance Settings sourced from Cloudery, ensured safe operation when the Cloudery client is absent, and refactored Cloudery configuration handling for backward compatibility. These changes reduce failure modes, improve user consent/compliance messaging, and lay groundwork for future partner-specific features.

June 2023

2 Commits • 2 Features

Jun 1, 2023

Month: 2023-06 focused on delivering configurable client-side hygiene improvements and enhanced synchronization telemetry within cozy/cozy-client. The two featured changes increase flexibility and observability while preserving backward compatibility, setting the stage for targeted client customization and better sync diagnostics across Cozy clients.

Activity

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Quality Metrics

Correctness95.6%
Maintainability90.6%
Architecture91.0%
Performance89.8%
AI Usage20.6%

Skills & Technologies

Programming Languages

DockerfileGoHTMLHTTPJavaScriptMarkdownPOTypeScriptYAML

Technical Skills

API DesignAPI DevelopmentAPI DocumentationAPI IntegrationAPI developmentAPI integrationBackend DevelopmentCloud Storage IntegrationConfiguration ManagementContainerizationCouchDBData ModelingDependency ManagementDevOpsDocker

Repositories Contributed To

2 repos

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

cozy/cozy-stack

Nov 2024 May 2026
12 Months active

Languages Used

GoJavaScriptYAMLMarkdownPOHTTPHTMLDockerfile

Technical Skills

API DesignAPI DevelopmentAPI IntegrationBackend DevelopmentConfiguration ManagementGo

cozy/cozy-client

Jun 2023 Aug 2025
6 Months active

Languages Used

JavaScriptTypeScript

Technical Skills

API DevelopmentAPI developmentJavaScriptNode.jsfull stack developmentDependency Management