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Johann Hofmann

PROFILE

Johann Hofmann

Worked extensively on browser automation, privacy engineering, and HTTP standards, contributing to repositories such as web-platform-tests/wpt, httpwg/http-extensions, and w3c-fedid/digital-credentials. Delivered features including partitioned cookie test infrastructure, a layered cookies specification draft, and comprehensive privacy documentation for the Digital Credentials API. Used JavaScript, HTML, and Markdown to implement and document changes, focusing on aligning test and specification behavior with evolving web standards. Enhanced cookie management by clarifying Max-Age semantics and enabling immediate expiration, while improving documentation quality, contributor recognition, and governance. Emphasized collaboration, technical writing, and standards development to support interoperability and privacy-by-design principles.

Overall Statistics

Feature vs Bugs

86%Features

Repository Contributions

17Total
Bugs
1
Commits
17
Features
6
Lines of code
2,871
Activity Months7

Your Network

904 people

Work History

January 2026

1 Commits • 1 Features

Jan 1, 2026

January 2026 (2026-01) monthly summary for httpwg/http-extensions: Delivered a focused feature to improve cookie lifecycle control in layered-cookies by enabling max-age=0 for immediate expiration, aligned with related issues and draft changes, and prepared groundwork for spec progress. No major bugs fixed this month; ongoing improvements in collaboration, testing, and review processes.

November 2025

2 Commits • 1 Features

Nov 1, 2025

November 2025: Documentation-focused month for httpwg/http-extensions; concentrated on Layered Cookies Specification acknowledgments and contributor attribution improvements. No major bug fixes this period; emphasis on clarity, recognition, and onboarding of contributors.

August 2025

1 Commits • 1 Features

Aug 1, 2025

Monthly summary for 2025-08 focused on refining the httpwg/http-extensions cookies specification. Delivered a key feature by clarifying the Layered Cookies Draft: removed an outdated Max-Age compatibility note to prevent misinterpretation and improve implementer guidance. No major bugs fixed this month. The change reduces interoperability risk and enhances consistency across browsers and servers. All work is tracked with a precise commit for traceability.

July 2025

1 Commits • 1 Features

Jul 1, 2025

July 2025: Delivered updates to the Digital Credentials Privacy & Security Questionnaire to clarify API purpose, emphasize user-mediated communication, and support selective disclosure. Tightened guidance on response encryption and request transparency to align with evolving privacy/security standards, boosting auditability and developer confidence. No major bugs fixed this month; primary focus on documentation, alignment, and readiness for broader adoption. This work enhances interoperability, compliance readiness, and reduces risk for deployments using the digital credentials feature.

June 2025

10 Commits • 1 Features

Jun 1, 2025

June 2025 monthly highlights for w3c-fedid/digital-credentials focused on strengthening privacy documentation and guidance around the Digital Credentials API. The work delivers clear privacy expectations for developers, aligns with privacy-by-design principles, and improves governance through better issue tracking and content hygiene.

May 2025

1 Commits • 1 Features

May 1, 2025

May 2025: Delivered groundwork for the HTTP cookie modernization in the httpwg/http-extensions repo. Created the draft document draft-ietf-httpbis-layered-cookies.md outlining a new layered cookie model, updating server/client behavior, syntax, semantics, and security considerations, effectively obsoleting RFC 6265 and 6265bis. This positions the project for standards-track progression and clarifies guidance for implementers. No major bugs fixed this month. Ongoing work focuses on aligning with the cookie-layering approach and preparing for consensus and contributions across the HTTP WG.

April 2025

1 Commits

Apr 1, 2025

April 2025: Focused on stabilizing cookie-related tests in web-platform-tests/wpt by fixing Test Driver's handling of partitioned cookies and aligning test infra with WebDriver specifications. Delivered a targeted bug fix and infrastructure updates to improve reliability, coverage, and confidence in cookie behavior under partitioned scenarios.

Activity

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Quality Metrics

Correctness93.0%
Maintainability93.0%
Architecture91.8%
Performance83.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

HTMLJavaScriptMarkdown

Technical Skills

Browser AutomationCode FormattingDocumentationHTTP StandardsHTTP standardsPrivacyPrivacy AnalysisPrivacy EngineeringSecurityTechnical WritingTestingWeb DevelopmentWeb Standardscollaborationcookie management

Repositories Contributed To

3 repos

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

w3c-fedid/digital-credentials

Jun 2025 Jul 2025
2 Months active

Languages Used

HTMLMarkdown

Technical Skills

Code FormattingDocumentationPrivacyPrivacy AnalysisPrivacy EngineeringTechnical Writing

httpwg/http-extensions

May 2025 Jan 2026
4 Months active

Languages Used

Markdown

Technical Skills

DocumentationHTTP StandardsTechnical Writingcollaborationdocumentationstandards development

web-platform-tests/wpt

Apr 2025 Apr 2025
1 Month active

Languages Used

JavaScript

Technical Skills

Browser AutomationTestingWeb Development