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tomoki shimomura

PROFILE

Tomoki Shimomura

Over 16 months, Shimot built and refined editor features for the Automattic/gutenberg and WordPress/gutenberg repositories, focusing on block development, UI consistency, and maintainability. He delivered enhancements such as unified text alignment, dynamic block styling, and improved navigation controls, using JavaScript, React, and PHP. Shimot addressed complex migration challenges by introducing backward-compatible utilities and streamlined block attributes, ensuring seamless upgrades and consistent rendering. His work included targeted bug fixes, code refactors, and documentation updates, which reduced technical debt and improved onboarding. The depth of his contributions is evident in robust, user-focused solutions that enhanced both editor experience and code quality.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

77Total
Bugs
16
Commits
77
Features
33
Lines of code
4,218
Activity Months16

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026 (2026-03) performance summary for Automattic/gutenberg: Delivered a new Cover block feature that enables looping of YouTube background videos via a playlist parameter, enhancing user engagement for media-rich pages. Implemented with code updates to the block library and PHP index, supported by targeted PHPCS fixes and package updates to ensure quality and stability. Minor playlist-related fixes were completed to ensure smooth playback across environments. This work demonstrates deep proficiency in Gutenberg block development, PHP/JavaScript, and CI quality processes, delivering measurable UX improvement and maintainability gains.

February 2026

9 Commits • 4 Features

Feb 1, 2026

February 2026 monthly summary: Delivered key typography and styling enhancements across Gutenberg blocks, with a focus on consistent text alignment, color customization, and robust styling controls. Implemented block-level style migration for textAlign, improved heading and tab blocks, extended icon block styling, and fixed critical UI bugs (featured image aspect ratio default, post comments typography). These changes enhance content presentation, editor fidelity, and developer experience, driving clearer business value and faster content authoring.

January 2026

11 Commits • 4 Features

Jan 1, 2026

January 2026: Delivered significant typography and editor UX improvements across Gutenberg core blocks. Key work includes migrating text alignment support across Heading, Comment Edit Link, Comment Date, Comment Reply Link, Comments Title, and Author Biography blocks; adding visibility controls for more/nextpage navigation blocks; introducing breadcrumbs example previews; expanding dynamic block styling with has-custom-css and new attributes; and updating Comments Title handling to migrate away from legacy attributes. This work involved 11 commits across WordPress/gutenberg. Major bug fix included fix for nextpage-more-visibility. Overall, the month delivered more consistent content layouts, richer editorial control, and more flexible styling options, enabling publishers to achieve better typography and faster design iterations. Technologies/skills demonstrated include cross-block migrations, block attribute evolution, editor UX improvements, and collaborative, co-authored development.

December 2025

6 Commits • 1 Features

Dec 1, 2025

December 2025: Delivered a unified text alignment system across the Gutenberg editor blocks and removed anchor functionality from the Core/More block to streamline UX and reduce maintenance complexity. The key changes unify text alignment across Button, Paragraph-related blocks, and Comments, with left/center/right options and support for align-wide and align-full on Paragraphs. Migration utilities were introduced to preserve backward compatibility during the rollout, and block attributes/styles were updated to ensure consistent rendering in both the editor and live previews. This work improves content fidelity, editor usability, and maintainability, while reducing fragmentation across blocks.

November 2025

6 Commits • 3 Features

Nov 1, 2025

Summary for 2025-11: Delivered significant Gutenberg editor enhancements focused on editor UX, data schemas, and performance. Key features delivered include: (1) Term Blocks Enhancements — added dynamic levelOptions to the Term Name block, introduced a visibility key in the block JSON schema, provided example previews for term-count and term-name blocks, and disabled Term Query blocks in Widgets Editor to streamline UI. (2) Comment Editor UX Improvements — improved visibility of comments count and links in the StyleBook, added handling for missing posts with a default message, and introduced a pseudo-link for non-existent posts to improve navigation. (3) HTMLEditModal Refactor — refactored HTMLEditModal to remove editor styles injection logic, simplifying the modal and boosting block editor performance. Major bugs fixed include ensuring previews render correctly for comments in the StyleBook, robust handling of missing-post scenarios, and reducing UI fragility by removing unnecessary style injection. Overall impact: enhanced authoring experience, faster editor performance, and easier maintenance, reducing friction for content creators and editors while increasing reliability of previews and navigation. Technologies/skills demonstrated: JavaScript/React-based Gutenberg blocks, JSON schema updates, performance-oriented refactors, and strong cross-functional collaboration (noted co-authored commits).

October 2025

6 Commits • 1 Features

Oct 1, 2025

October 2025 highlights: Delivered user-facing Accordion Block enhancements, hardened block metadata handling, and improved data integrity with safer, backward-compatible changes. The work strengthens shareability, content safety, and upgrade stability while showcasing robust Gutenberg development patterns.

September 2025

3 Commits • 2 Features

Sep 1, 2025

September 2025 monthly summary for Automattic/gutenberg. Focused on UI consistency, accurate style preset application, and code quality improvements. Key deliveries included: (1) Group Block Variations UI Consistency to standardize presentation by removing variation-specific text styling from example paragraphs, achieving a uniform base look; (2) Search Block border-radius presets fixed to apply correctly when the search button is inside the input, ensuring per-corner radii and overall radius respect presets; (3) Code quality improvement by trimming spaces in inline styles for social icons to enhance readability and potentially reduce CSS size. Overall impact: improved UI predictability across themes, easier maintenance, tighter alignment with the design system, and reduced risk of style drift. Demonstrated technologies/skills: Gutenberg block editor development, React-based UI, CSS/inline style refactoring, and focused code quality practices.

August 2025

2 Commits • 1 Features

Aug 1, 2025

August 2025 Monthly Summary: Gutenberg repo contributions focused on stabilizing editor behavior and improving navigation UX. Delivered a bug fix for duotone attributes and a UI refactor for the calendar navigator, aligning with performance and UX goals.

July 2025

5 Commits • 1 Features

Jul 1, 2025

Monthly summary for 2025-07 highlighting key developer accomplishments for the Automattic/gutenberg repository, with a focus on business value, reliability, and maintainability.

June 2025

5 Commits • 3 Features

Jun 1, 2025

June 2025 performance summary for Automattic/gutenberg. Focused on stabilizing the editor experience, reducing technical debt, and improving contributor documentation. Delivered targeted bug fixes, structural refactors, and documentation polish that collectively enhance UX, maintainability, and onboarding for maintainers and contributors.

May 2025

6 Commits • 3 Features

May 1, 2025

For 2025-05 (Automattic/gutenberg), delivered feature-focused enhancements and documentation improvements with no explicit major bug fixes reported. Key features delivered: 1) Unified ToolsPanel UI for Block Settings across File Block, Comment Author Name Block, List Block, and Embed Block. Commits include 16fe2353e818d211d5b72a640ced17a15b642753, a5d288757fed0b0eb2f1a542bcf6203f7aae2d4d, 25d9b97548730a25d19ed600d147d97e79dd243d, and 5d41556d61f2851ca6c77b0ce45df17dc210c061. 2) Spinner Component Documentation Enhancement: updated spinner example to JSX usage for clearer documentation. Commit: de9d8bf200d7a2b9c6bdfc4108c46147da5124bc. 3) Workflow Configuration Readability Cleanup: reformatted GitHub Actions workflow YAML files to improve readability without altering functionality. Commit: d12e4ccf7e7dd9e4b78082be3cae732cd013e5b4. Overall impact: improved UX consistency across blocks, easier maintenance, and clearer CI/CD configuration, enabling faster feature iteration and better developer onboarding. Technologies/skills demonstrated: React component refactoring and ToolsPanel integration, JSX-based documentation, YAML workflow formatting, and documentation practices.

April 2025

2 Commits • 1 Features

Apr 1, 2025

April 2025: Delivered targeted fixes and documentation updates for Gutenberg in Automattic/gutenberg, focusing on UI consistency, bug prevention, and alignment with product decisions. Strengthened maintainability through clearer code patterns and centralized design decisions.

March 2025

4 Commits • 3 Features

Mar 1, 2025

March 2025 monthly summary for Automattic/gutenberg highlighting key feature delivery, bug fixes, and overall impact. Focused on editor UX improvements, UI consistency, and maintainability enhancements that deliver measurable business value and improved developer experience.

February 2025

5 Commits • 1 Features

Feb 1, 2025

February 2025 — Focus on UI reliability, accessibility, and expanded formatting options in Gutenberg. Delivered critical bug fixes for the Format Library UI and shadow controls, and introduced non-interactive formatting for post navigation links, boosting developer velocity and end-user styling capabilities. Reduced UI errors, improved accessibility, and laid groundwork for broader formatting features.

January 2025

5 Commits • 4 Features

Jan 1, 2025

January 2025 — Monthly highlights for Automattic/gutenberg. Delivered user-focused customization enhancements, usability improvements, and targeted code-quality fixes across multiple blocks. The work enhances end-user styling flexibility, maintains consistency with other blocks, and improves developer experience through cleaner HTML generation and better documentation. Key outcomes include a clearable color picker for the Social Links Block, documented heading color customization for the Post Content Block, expanded non-interactive formatting in the Home Link Block, a placeholder attribute for the Details block's summary, and a refactor of CSS class generation in the Navigation Submenu Block to a cleaner, array-based approach that eliminates trailing spaces.

December 2024

1 Commits

Dec 1, 2024

December 2024: Delivered a critical typography inheritance fix for the Button block in Gutenberg. Fixed inner elements to inherit typography correctly across edit and save flows, updating block editor hooks, deprecated-version handling, and relevant Button block components to ensure consistent typography attributes. The change aligns with the #68023 request and was implemented via commit e5dca5461c0699b4ed902bbea375e40b0d2f803c.

Activity

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Quality Metrics

Correctness96.2%
Maintainability91.8%
Architecture90.6%
Performance90.2%
AI Usage22.0%

Skills & Technologies

Programming Languages

CSSJSONJavaScriptMarkdownPHPSCSSTypeScriptYAML

Technical Skills

Block Editor DevelopmentCI/CDCSSCSS GridComponent DevelopmentComponent Library DevelopmentDocumentationFront End DevelopmentFront-end DevelopmentFrontend DevelopmentGitHub ActionsGutenberg Block DevelopmentJSON schemaJavaScriptPHP Development

Repositories Contributed To

2 repos

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

Automattic/gutenberg

Dec 2024 Mar 2026
13 Months active

Languages Used

JavaScriptMarkdownPHPCSSSCSSTypeScriptYAMLJSON

Technical Skills

Front End DevelopmentJavaScriptReactWordPress DevelopmentDocumentationGutenberg Block Development

WordPress/gutenberg

Nov 2025 Feb 2026
4 Months active

Languages Used

JSONJavaScriptMarkdownPHP

Technical Skills

JSON schemaReactWordPressblock developmentfront end developmentUI/UX design