Hamza Miloud Amar
Expert React Developer & CSS Enthusiast
Expert Frontend Developer with a decade of experience in building enterprise-scale design systems and accessible web applications. Architecting large-scale projects with Next.js, optimizing web performance, and ensuring WCAG compliance across diverse user needs. Proven leader in scaling frontend architecture and implementing inclusive design practices, resulting in an 80% reduction in production issues while maintaining AA/AAA accessibility standards.
Experience
UI library | Pillar UI
Creator
Open Source
2023/03 - Present
- Built a high-performance 11KB design system, prioritizing bundle size and delivering a noticeable improvement in application speed.
- Reduced CSS bundle size by 35% (25KB) through a custom optimization methodology, atomic naming, fluid layout, and relative values for better reusability, significantly boosting runtime performance.
- Implemented a scalable theming strategy using CSS variables rather than CSS-in-JS solutions, which led to a smaller bundle size and a flexible structure that is easy to customize.
- Ensured exceptional accessibility, reaching 95% WCAG AA compliance through automated testing with Axe, Storybook, and Playwright, which consistently reduced accessibility issues.
- Elevated the user experience with seamless dark mode and RTL support, alongside comprehensive compatibility for color contrast, focus management, motion preferences, text resizing, and high contrast modes, accelerating user adoption.
- Managed development using GitHub Projects, streamlining sprint planning and issue tracking, and ensuring 95%+ on-time delivery across sprints.
React
Turborepo
Rollup
PostCSS
Storybook
Typescript
Chromatic
Axe
Playwright
React testing library
Tsup
Changeset
Lead Frontend Developer | Acrative
Part Time
Freelancer
2023/12 - 2025/02
- Designed comprehensive UI markup and defined acceptance criteria in Figma, establishing a cohesive visual identity that reduced design-dev back-and-forth by 30% and accelerated development timelines.
- Collaborated with the team to elevate code quality by replacing the legacy test pyramid with a modern testing trophy strategy. Refactored and rewrote flaky and brittle tests, leading to an 85% reduction in production bugs and transforming our test suite into a reliable, high-confidence safety net.
- Worked alongside closely with Product Owners and back-end developers, implementing API integrations, data fetching patterns, and caching strategies within agile development workflows.
- Optimized application performance by implementing advanced techniques including code splitting, lazy loading, image optimization, resource hints, and rendering patterns, resulting in improved Core Web Vitals metrics and enhanced user experience.
- Led migration from Next.js 10 to Next.js 15, integrating React Server Components and Server Actions to improve Largest Contentful Paint (LCP) metrics and enhance progressive enhancement.
- Built and architected a scalable design system for multiple platforms (OpenHandMorocco, HunaBook, and Admin dashboards) using React.js, Angular, and TypeScript, resulting in 20% increase development efficiency and ensuring consistent design implementation across all projects.
React
Angular
Next.js
TypeScript
Figma
Jest
Playwright
Storybook
vitest
Axe
SCSS
HTML
CSS
Frontend Developer
Freelance
2019/06 - PRESENT
- Refactored and optimized the CSS codebase by implementing (ITCSS, BEM) architecture, modern layout practices, fluid layout, and CSS variables for theming. This initiative significantly improved code quality, resolved cascade issues, and enabled easier maintenance and feature development.
- Architected a scalable React + TypeScript frontend using Atomic Design to retire legacy jQuery code, boosting maintainability of Chaabi lil Iskan’s internal apps.
- Mentored junior and mid-level engineers moving from Angular and jQuery to React + TypeScript. By conducting hands-on workshops and 1:1 coaching covering React fundamentals, Thinking in React, rendering strategies, and data-fetching patterns, helping them shift to a modern, declarative frontend mindset.
- Created a custom React dashboard solution using React, TypeScript, and Next.js, featuring 5 pre-built design systems and comprehensive support for React meta-frameworks, helping streamline development workflow and maintain up-to-date, modern web applications.
React
Next.js
TypeScript
Atomic Design
ITCSS
BEM
CSS
SCSS
jQuery
Frontend Architecture
Full-Stack Developer
Freelance
2015/06 - 2018/11
- Built full-stack apps for local businesses e-commerce, car wash, gaming, and booking platforms, boosting engagement and streamlining operations.
- Built and designed comprehensive applications including an Accounting Firm management system and Excel Learning Group platform for Marrakech.
- Collaborated with cross-functional teams to design and illustrate game characters for mobile games published on the Google Play Store.
React
Node.js
Express
MongoDB
Full-Stack Development
JavaScript
Game Design
UI/UX
Cross-Functional Collaboration