Jacob 'Kurt' Groß
Jacob 'Kurt' Groß is an individual developer and creator focused on making the web performant, accessible, and user-friendly. His work centers on Core Web Vitals, browser rendering and JavaScript runtime performance, React, CSS, Node.js, micro-frontends, developer experience, and open-source tools.
At a Glance
- Web developers and frontend engineering teams
- Performance, UX, accessibility, and developer-experience practitioners
- Users of Claude Code, Codex, Cursor, OpenCode, Devin, and other agent harnesses
- Esports tournament organizers and players
AI Tools by Jacob 'Kurt' Groß
(1)
skillzero
CLI for AI Agent Skill Management
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Latest News
Posted Show HN: Skillzero – save tokens by omitting skills from agent context
Released skillzero v0.2.0 on GitHub
Published Great React UX: Replay input after hydration, describing how to preserve user input made before React hydration
Published How Framer transforms AST to speed up hydration, describing Rolldown/OXC-AST-based preloading to reduce React hydration Suspense waterfalls
Products & Services
An open-source CLI that reduces agent context bloat by managing installed skills in three categories: unmanaged skills remain visible, hidden skills are manually invokable but removed from automatic context, and collection skills bundle related skills behind one entry point. It can be run with npx skillzero, pnpx, yarn dlx, or aube dlx.
An open-source Google Chrome extension listed among Groß's browser extensions.
A Chrome extension that reminds users to take a break; Groß's tools page lists 1,000 active users.
A Chrome tab-management extension listed on Groß's tools page.
Market Position
Groß's work is positioned around practical, performance-first and accessibility-conscious web engineering. skillzero differentiates from simply installing skills and exposing all of them by separating everyday, hidden, and collection skills so agents receive less irrelevant context while users retain manual access; the repository cites Vercel's skills CLI as the update mechanism it can work with.
Leadership
Founders
Jacob 'Kurt' Groß
Staff Performance Engineer at Framer (Senior in 2024; Staff since 2025); previously Principal Engineer at Jochen Schweizer mydays Group (2021–2024); computer science and Human-Computer-Interaction graduate of LMU Munich (2021); professional software-engineering training at Jochen Schweizer (2017); co-founder of the OPL esports company; web-performance consultant for 3perf; creator of multiple open-source projects and Chrome extensions.
Executive Team
Jacob 'Kurt' Groß
Independent developer/creator; Staff Performance Engineer at Framer
Munich-based performance engineer and open-source creator; previously Principal Engineer at Jochen Schweizer mydays Group and a web-performance consultant for 3perf.
Founding Story
Groß describes his motivation as growing up in Munich with limited-budget, slow devices and experiencing long waits for websites to load. Since beginning to develop, he has aimed to make his work accessible to people using slow devices or connections; this led to personal web-performance writing, open-source projects, browser extensions, and the OPL esports venture.
Target Markets
- Web developers and frontend engineering teams
- Performance, UX, accessibility, and developer-experience practitioners
- Users of Claude Code, Codex, Cursor, OpenCode, Devin, and other agent harnesses
- Esports tournament organizers and players
- Developers and performance engineers optimizing websites and web applications
- Teams improving Core Web Vitals, hydration, JavaScript bundling, image delivery, and interaction responsiveness
- Agent users who install many skills but want to reduce irrelevant context and token usage
- Users needing browser extensions for typography, tab management, focus/break reminders, or website behavior
- Esports organizers creating and operating online tournaments