Case Study - Enhancing Performance & Front-End Optimization

Overview

As one of France’s largest health insurance providers, Harmonie Mutuelle required a high-performing, accessible, and scalable digital platform to serve thousands of customers daily.

The challenge was to optimize JavaScript, enhance front-end performance, and implement best practices in responsive web design to ensure smooth, fast interactions for users across devices.

To achieve this, I focused on JavaScript profiling, performance optimizations, and compliance with W3C accessibility standards, creating a seamless user experience for Harmonie Mutuelle’s platform.

Key Contributions

1️⃣ JavaScript Profiling & Performance Optimization

I performed in-depth JavaScript profiling to identify and eliminate bottlenecks, resulting in:

• Faster page loads and smoother interactions.
• Reduced render-blocking scripts for improved performance.
• Optimized front-end assets, decreasing load times across the website.

2️⃣ Enhancing Front-End Development with Native JavaScript

To ensure a seamless user experience, I optimized JavaScript logic, improving UI responsiveness and reducing unnecessary reflows and repaints.

3️⃣ Implementing Responsive Web Design

I applied mobile-first development principles, ensuring the Harmonie Mutuelle platform was fully responsive across all screen sizes, from mobile to desktop.

4️⃣ Accessibility & W3C Compliance

Adhering to W3C accessibility standards, I:

• Improved semantic HTML structure for screen readers.
• Enhanced color contrast ratios for better readability.
• Implemented keyboard-friendly navigation to improve accessibility for all users.

5️⃣ Integration within Enterprise Ecosystem

Working within a Java J2EE and Liferay-based environment, I ensured seamless integration of modern front-end improvements while maintaining backward compatibility with enterprise systems.

Conclusion: A Faster, More Accessible Platform

By focusing on performance optimizations, accessibility improvements, and responsive design, we significantly enhanced Harmonie Mutuelle’s digital platform.

My work improved load times, usability, and accessibility, ensuring a seamless experience for customers while adhering to modern front-end development best practices.

What I Did