Lars Kappert
Freelance Frontend Architecture & Performance at Summation
Randstad, Netherlands
Summary
🤩
Rockstar🎓
Top SchoolLars Kappert is an experienced freelance frontend architect and developer with about 14 years of professional experience and two decades of hands-on work across campaigns, large platforms and developer tooling. He specializes in JavaScript/TypeScript, Node.js and modern frameworks like React and Next.js, and brings deep expertise in performance optimization, CI/CD (GitHub Actions), monorepo tooling (Nx/Turborepo) and cloud deployments. Lars repeatedly moves projects from prototype to robust, high-performance platforms—most notably shaping long-lived frontend foundations at Videoland and modernizing monorepos and DX for companies like Kadena and Grit. He is an active open-source contributor, with meaningful work in widely used projects such as Babel, Storybook and release-it, and builds practical automation from dotfiles to CI to streamline developer workflows. Preferencing contract and remote work around the Randstad/Utrecht area, he combines hands-on coding with coaching and architectural leadership to squeeze out milliseconds and improve team productivity.
15 years of coding experience
11 years of employment as a software developer
Bachelor Information and Communication Technology, Bachelor Information and Communication Technology at Hanzepropaedeutics Economics, propaedeutics Economics at University of Groningen
English, Dutch
Github Skills (47)
astm10
markdown10
git10
javascript10
npm10
storybook10
testing10
gulp10
typescript10
bash10
s610
dotfile10
cicd10
homebrew10
automation10
Programming languages (17)
Github contributions (5)
webpro-nl/knip
Oct 2022 - Jan 2023
✂️ Find unused files, dependencies and exports in your JavaScript and TypeScript projects. Knip it before you ship it!
Role in this project:
Front-end Developer & Test Automation Engineer
Front-end Developer & Test Automation EngineerContributions:471 releases, 403 reviews, 496 commits in 3 months
Contributions summary:Lars primarily contributed to the front-end of the project, focusing on test coverage improvements and UI component implementation. Their work involved modifying and enhancing existing test files, integrating new tests for added features, and creating component tests. They also worked on updating testing and configuration to integrate with new features. The user's work included interacting with multiple UI component libraries like React and TypeScript.
javascripttypescriptdependency-analysislintmaintenance
release-it/release-it
Jan 2014 - Jan 2023
🚀 Automate versioning and package publishing
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:375 releases, 56 reviews, 1555 commits in 9 years 1 month
Contributions summary:Lars contributed to the release automation process, making improvements to both the source and distribution repositories. They focused on streamlining the continuous integration and continuous delivery (CI/CD) pipeline by implementing and refining Git-based automation. Additionally, the user addressed and resolved specific issues related to the project's Git repository, ensuring more robust and streamlined releases.
versioningrelease-automationpublishnpmautomation
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