
Matijs developed and maintained the NL Design System, focusing on scalable UI component libraries and robust build infrastructure across repositories such as nl-design-system/candidate. He engineered token-driven React components, modernized CI/CD pipelines with GitHub Actions, and introduced automated visual regression testing using Chromatic. His work included refactoring CSS and TypeScript codebases, implementing design tokens for consistent theming, and optimizing dependency management with pnpm and Terraform. By standardizing configuration and governance, Matijs improved release reliability, security, and onboarding. His technical depth is evident in the integration of Storybook, Vitest, and advanced automation, resulting in maintainable, high-quality frontend systems.

October 2025 monthly summary for nl-design-system/rijkshuisstijl-community: Strengthened the build system and dependency management to improve security, reliability, and maintainability. Delivered a hardened build configuration, aligned configuration with the example repository, and tightened dependency resolution to reduce supply-chain risk and improve deterministic builds. The work demonstrates a proactive approach to securing the CI/CD pipeline and ensuring stable releases.
October 2025 monthly summary for nl-design-system/rijkshuisstijl-community: Strengthened the build system and dependency management to improve security, reliability, and maintainability. Delivered a hardened build configuration, aligned configuration with the example repository, and tightened dependency resolution to reduce supply-chain risk and improve deterministic builds. The work demonstrates a proactive approach to securing the CI/CD pipeline and ensuring stable releases.
Summary for 2025-09: Delivered high-value improvements across design-system repositories with a focus on reliable visual testing, modernized tooling, and stronger governance. Achievements span CI/CD stability, designer/developer collaboration, and security-conscious processes that reduce risk and accelerate delivery. Key features delivered: - Chromatic CI integration and stability improvements in nl-design-system/candidate: integrated Chromatic into CI, streamlined changeset-status workflow, fixed artifact paths, disabled TurboSnap, enabled live Chromatic runs, clarified token usage. Commits included changes to the changeset workflow and artifact handling. - Storybook upgrade to v9 across packages with live-updating enhancements: upgraded Storybook to v9 and refactored imports to enable automatic live updates. - CI coverage reporting and Codecov integration: enabled code coverage reporting in CI, fixed artifact paths, and ensured Codecov receives correct SHA and artifacts. - Governance and security enhancements across repositories: updated CODEOWNERS for design-token governance, strengthened access control and onboarding governance (new users, team permissions, onboarding templates), and introduced security measures (Secret Scanning and Push Protection in relevant repos). - Tooling and formatting upgrades: upgraded tooling to pnpm v10.x, unified repository hygiene (npm/Prettier/pnpm), aligned Prettier with ES Modules (mjs), and improved formatting consistency. Major bugs fixed: - Fixed artifact download path for Chromatic builds and ensured correct run_id resolution for Chromatic push events. - Resolved issues with live Chromatic runs and TurboSnap enabling smoother visual testing workflows. - Corrected Codecov SHA handling and artifact path references in CI, and stabilized the CI workflow. - Addressed misconfigurations in repository pages/branches during Terraform-related repos renaming and deployment setups. Overall impact and accomplishments: - Increased release confidence and faster feedback cycles from stabilized visual testing and accurate test coverage reporting. - Strengthened security and governance across the portfolio, reducing risk of misconfigurations and unauthorized access. - Improved developer productivity through modernization of tooling and standardized repo configurations. - Enabled scalable collaboration with clearer ownership and onboarding processes across multiple repos. Technologies/skills demonstrated: - Visual testing and UI workflow: Chromatic, Storybook (v9) - CI/CD and code quality: GitHub Actions, Codecov, changesets, PNPM workspaces, npm, Prettier - Governance and security: CODEOWNERS, access control, Secret Scanning, Push Protection - Documentation and onboarding: updated docs and onboarding templates, repository hygiene practices
Summary for 2025-09: Delivered high-value improvements across design-system repositories with a focus on reliable visual testing, modernized tooling, and stronger governance. Achievements span CI/CD stability, designer/developer collaboration, and security-conscious processes that reduce risk and accelerate delivery. Key features delivered: - Chromatic CI integration and stability improvements in nl-design-system/candidate: integrated Chromatic into CI, streamlined changeset-status workflow, fixed artifact paths, disabled TurboSnap, enabled live Chromatic runs, clarified token usage. Commits included changes to the changeset workflow and artifact handling. - Storybook upgrade to v9 across packages with live-updating enhancements: upgraded Storybook to v9 and refactored imports to enable automatic live updates. - CI coverage reporting and Codecov integration: enabled code coverage reporting in CI, fixed artifact paths, and ensured Codecov receives correct SHA and artifacts. - Governance and security enhancements across repositories: updated CODEOWNERS for design-token governance, strengthened access control and onboarding governance (new users, team permissions, onboarding templates), and introduced security measures (Secret Scanning and Push Protection in relevant repos). - Tooling and formatting upgrades: upgraded tooling to pnpm v10.x, unified repository hygiene (npm/Prettier/pnpm), aligned Prettier with ES Modules (mjs), and improved formatting consistency. Major bugs fixed: - Fixed artifact download path for Chromatic builds and ensured correct run_id resolution for Chromatic push events. - Resolved issues with live Chromatic runs and TurboSnap enabling smoother visual testing workflows. - Corrected Codecov SHA handling and artifact path references in CI, and stabilized the CI workflow. - Addressed misconfigurations in repository pages/branches during Terraform-related repos renaming and deployment setups. Overall impact and accomplishments: - Increased release confidence and faster feedback cycles from stabilized visual testing and accurate test coverage reporting. - Strengthened security and governance across the portfolio, reducing risk of misconfigurations and unauthorized access. - Improved developer productivity through modernization of tooling and standardized repo configurations. - Enabled scalable collaboration with clearer ownership and onboarding processes across multiple repos. Technologies/skills demonstrated: - Visual testing and UI workflow: Chromatic, Storybook (v9) - CI/CD and code quality: GitHub Actions, Codecov, changesets, PNPM workspaces, npm, Prettier - Governance and security: CODEOWNERS, access control, Secret Scanning, Push Protection - Documentation and onboarding: updated docs and onboarding templates, repository hygiene practices
August 2025 performance summary for NL Design System work across two repositories: nl-design-system/candidate and nl-design-system/documentatie. Delivered foundation-level CI reliability, UI modernization, design-token enablement, and documentation improvements that boost product quality and developer velocity. Key outcomes include establishing Chromatic CI baseline with TurboSnap integration and fixes, ongoing dependency and tooling maintenance, comprehensive UI component refactors, and a suite of build-readiness and tokenization enhancements. Documentation improvements and security-oriented CI governance strengthened onboarding and risk posture. These efforts reduce time-to-merge, improve visual consistency for components, and position the design system for scalable growth across the design system ecosystem.
August 2025 performance summary for NL Design System work across two repositories: nl-design-system/candidate and nl-design-system/documentatie. Delivered foundation-level CI reliability, UI modernization, design-token enablement, and documentation improvements that boost product quality and developer velocity. Key outcomes include establishing Chromatic CI baseline with TurboSnap integration and fixes, ongoing dependency and tooling maintenance, comprehensive UI component refactors, and a suite of build-readiness and tokenization enhancements. Documentation improvements and security-oriented CI governance strengthened onboarding and risk posture. These efforts reduce time-to-merge, improve visual consistency for components, and position the design system for scalable growth across the design system ecosystem.
Month: 2025-07. This period focused on strengthening tooling, CI/CD reliability, and design-system governance while delivering new components and ensuring compatibility with evolving frontend tooling. The work emphasized business value: more reliable test execution, faster, safer releases, consistent UI components, and stronger governance across design-system repositories.
Month: 2025-07. This period focused on strengthening tooling, CI/CD reliability, and design-system governance while delivering new components and ensuring compatibility with evolving frontend tooling. The work emphasized business value: more reliable test execution, faster, safer releases, consistent UI components, and stronger governance across design-system repositories.
June 2025 performance snapshot for NL Design System work across themes, Terraform, candidate, documentatie, and Utrecht repositories. The month focused on establishing foundation components, tightening governance, stabilizing deployments, and modernizing tooling to deliver measurable business value while reducing maintenance overhead. Key features delivered: - Design Tokens Package Foundation: Created the new design tokens package @nl-design-system-unstable/start-design-tokens in nl-design-system/themes with a starter README to define token foundations. - Governance and approvals: Improved CODEOWNERS governance including refined approvals for design-token changes, kernteam-design exception for Figma token files, admin-revision hardening, and extended approvals for changesets. - Deployment stabilization: Stabilized Vercel deployments for gebruikersonderzoeken-next by disabling affected deployments and optimizing builds by skipping when there are no changes to the root or dependencies. - Maintenance and cost reduction: Prepared and archived legacy repositories (matomo, nlds-gravity-forms, publiccode-parser-action, tiptap) and cleaned Terraform configurations to reduce ongoing maintenance and hosting costs. - Tooling and documentation modernization: Migrated workspace management to pnpm-workspace.yaml and upgraded core tooling (Babel, ESLint, Rollup, Storybook, Vitest); introduced a DesignTokens display component in documentation to improve token visibility and copyability. Major bugs fixed: - Deployment reliability: Resolved deployment failures in gebruikersonderzoeken-next by gating problematic deployments and skipping non-changing builds. - Governance hygiene: Corrected CODEOWNERS typos and tightened review ownership to prevent misrouting of PRs. Overall impact and accomplishments: - Reduced time to deploy and increased pipeline reliability, enabling more frequent, safer releases. - Lowered ongoing maintenance and hosting costs through archiving of legacy repos and removal of outdated Terraform configurations. - Strengthened design token governance and collaboration through a dedicated kernteam-design, leading to clearer ownership and faster token changes. - Modernized tooling across the design-system workspace, improving compatibility, security, and developer experience, with improved documentation UX for design tokens. Technologies/skills demonstrated: - Design tokens architecture and packaging, Terraform, Vercel deployment optimization, PNPM workspaces, Babel, ESLint, Rollup, Storybook, Vitest, GitHub CODEOWNERS governance, repository archiving processes, and asset/documentation management.
June 2025 performance snapshot for NL Design System work across themes, Terraform, candidate, documentatie, and Utrecht repositories. The month focused on establishing foundation components, tightening governance, stabilizing deployments, and modernizing tooling to deliver measurable business value while reducing maintenance overhead. Key features delivered: - Design Tokens Package Foundation: Created the new design tokens package @nl-design-system-unstable/start-design-tokens in nl-design-system/themes with a starter README to define token foundations. - Governance and approvals: Improved CODEOWNERS governance including refined approvals for design-token changes, kernteam-design exception for Figma token files, admin-revision hardening, and extended approvals for changesets. - Deployment stabilization: Stabilized Vercel deployments for gebruikersonderzoeken-next by disabling affected deployments and optimizing builds by skipping when there are no changes to the root or dependencies. - Maintenance and cost reduction: Prepared and archived legacy repositories (matomo, nlds-gravity-forms, publiccode-parser-action, tiptap) and cleaned Terraform configurations to reduce ongoing maintenance and hosting costs. - Tooling and documentation modernization: Migrated workspace management to pnpm-workspace.yaml and upgraded core tooling (Babel, ESLint, Rollup, Storybook, Vitest); introduced a DesignTokens display component in documentation to improve token visibility and copyability. Major bugs fixed: - Deployment reliability: Resolved deployment failures in gebruikersonderzoeken-next by gating problematic deployments and skipping non-changing builds. - Governance hygiene: Corrected CODEOWNERS typos and tightened review ownership to prevent misrouting of PRs. Overall impact and accomplishments: - Reduced time to deploy and increased pipeline reliability, enabling more frequent, safer releases. - Lowered ongoing maintenance and hosting costs through archiving of legacy repos and removal of outdated Terraform configurations. - Strengthened design token governance and collaboration through a dedicated kernteam-design, leading to clearer ownership and faster token changes. - Modernized tooling across the design-system workspace, improving compatibility, security, and developer experience, with improved documentation UX for design tokens. Technologies/skills demonstrated: - Design tokens architecture and packaging, Terraform, Vercel deployment optimization, PNPM workspaces, Babel, ESLint, Rollup, Storybook, Vitest, GitHub CODEOWNERS governance, repository archiving processes, and asset/documentation management.
May 2025: Coordinated multi-repo modernization and governance improvements across nl-design-system components, delivering higher stability, faster PR cycles, and stronger security posture. Key initiatives spanned CI, package management, dependency updates, and governance workflows, with measurable improvements in build reliability and developer experience.
May 2025: Coordinated multi-repo modernization and governance improvements across nl-design-system components, delivering higher stability, faster PR cycles, and stronger security posture. Key initiatives spanned CI, package management, dependency updates, and governance workflows, with measurable improvements in build reliability and developer experience.
April 2025 performance highlights: Delivered foundational platform and process improvements across NL Design System repositories to boost deployment reliability, security, and developer velocity. Implemented deployment standardization, governance enhancements, and tooling upgrades that reduce risk, speed up delivery, and improve maintainability. Enabled design-system scalability through tokenization and build optimizations, while clarifying onboarding and documentation for contributors.
April 2025 performance highlights: Delivered foundational platform and process improvements across NL Design System repositories to boost deployment reliability, security, and developer velocity. Implemented deployment standardization, governance enhancements, and tooling upgrades that reduce risk, speed up delivery, and improve maintainability. Enabled design-system scalability through tokenization and build optimizations, while clarifying onboarding and documentation for contributors.
March 2025 was marked by substantial governance, security, and release-process improvements across the design-system portfolio, delivering standardized rulesets, enhanced access control, and modernized CI/CD with provenance. The work reduced deployment risk, improved traceability, and empowered autonomous releases while strengthening security and compliance across multiple repositories.
March 2025 was marked by substantial governance, security, and release-process improvements across the design-system portfolio, delivering standardized rulesets, enhanced access control, and modernized CI/CD with provenance. The work reduced deployment risk, improved traceability, and empowered autonomous releases while strengthening security and compliance across multiple repositories.
February 2025 performance summary: Delivered a broad set of business-value features and stability fixes across the design-system monorepo, elevating release velocity, consistency, and security. Focus areas included modernization of dependency workflows, centralized ruleset governance, CI/CD reliability, and tooling improvements. The month produced measurable reductions in build churn, faster deployment cycles, and improved contributor experience across multiple repositories.
February 2025 performance summary: Delivered a broad set of business-value features and stability fixes across the design-system monorepo, elevating release velocity, consistency, and security. Focus areas included modernization of dependency workflows, centralized ruleset governance, CI/CD reliability, and tooling improvements. The month produced measurable reductions in build churn, faster deployment cycles, and improved contributor experience across multiple repositories.
Concise monthly summary for 2025-01 across NL Design System repositories, focusing on delivering business value through tooling modernization, governance improvements, and environment upgrades. The month emphasized reliability, security, and maintainability across design-system repos while enabling faster iteration and onboarding for contributors.
Concise monthly summary for 2025-01 across NL Design System repositories, focusing on delivering business value through tooling modernization, governance improvements, and environment upgrades. The month emphasized reliability, security, and maintainability across design-system repos while enabling faster iteration and onboarding for contributors.
December 2024 monthly summary focusing on business value and technical delivery across the design-system ecosystem (candidate, themes, documentatie). Delivered key UI components, enhanced Storybook reliability, extended design tokens, and improved documentation, resulting in faster product iteration, consistent UI, and better developer onboarding.
December 2024 monthly summary focusing on business value and technical delivery across the design-system ecosystem (candidate, themes, documentatie). Delivered key UI components, enhanced Storybook reliability, extended design tokens, and improved documentation, resulting in faster product iteration, consistent UI, and better developer onboarding.
November 2024 performance summary for nl-design-system across candidate, documentatie, themes, and terraform repositories. The work centered on modernizing the build and QA pipeline, expanding a token-driven UI component library, and strengthening documentation, accessibility, and design governance. Delivered a cohesive set of UI components with associated design tokens, improved test coverage and CI reliability, and enhanced Storybook/documentation to accelerate product delivery and partner integration.
November 2024 performance summary for nl-design-system across candidate, documentatie, themes, and terraform repositories. The work centered on modernizing the build and QA pipeline, expanding a token-driven UI component library, and strengthening documentation, accessibility, and design governance. Delivered a cohesive set of UI components with associated design tokens, improved test coverage and CI reliability, and enhanced Storybook/documentation to accelerate product delivery and partner integration.
Month: 2024-10 — Concise monthly summary for nl-design-system/candidate. Focused on delivering maintainable, scalable design-system assets and reducing build duplication. No explicit major bug fixes reported in this period; work concentrated on refactors and new components that improve consistency and onboarding for future features.
Month: 2024-10 — Concise monthly summary for nl-design-system/candidate. Focused on delivering maintainable, scalable design-system assets and reducing build duplication. No explicit major bug fixes reported in this period; work concentrated on refactors and new components that improve consistency and onboarding for future features.
Overview of all repositories you've contributed to across your timeline