Frontend Developer (Freelance)

Location: Brussels, Belgium (Hybrid: 2-3 days remote per week)

Type: Freelance

About Us: Why Smile!

Passionate about tech, digital, and innovation? Join the 1,800 employees at Smile , the European leader in open-source integration, spread across 20 agencies in 9 countries. Collaborative spirit and knowledge sharing are at the heart of our DNA. Our experts push the boundaries of open source every day to build a smarter, more efficient, and more responsible digital world. Here, we don't just follow trends, we create them! Join Smile in Brussels and take part in projects that truly matter!

• Peer Support: Our proximity management by peers fosters dialogue and the implementation of a tailored career path.

• Continuous Learning: Because the digital sector is in constant motion, Smile is committed to making you an expert in your field, thanks to a comprehensive training offer: access to an e-learning platform, financing of certifications, and robust knowledge-sharing tools.

• Vibrant Culture: Your year will be animated by group and agency events: our annual convention, participation in trade fairs, summer parties, and both formal & informal afterworks.

Role Overview

We are seeking talented Frontend Developers (at Junior, Medior, or Senior levels) to join our team on behalf of one of our major strategic clients based in Brussels. In this role, you will be responsible for crafting high-performance, visually stunning, and highly accessible user interfaces.

You will translate design concepts into seamless interactive web experiences while integrating modern web standards and AI features. Depending on your seniority, you will either focus on delivering high-quality modular code or take the lead in choosing architectural patterns, optimizing frontend workflows, and mentoring your team members.

Key Responsibilities

• UI/UX Development: Build responsive, high-fidelity web applications using HTML5 , CSS3 , and advanced JavaScript .

• Framework Implementation: Develop modular and reusable components utilizing modern frontend ecosystems, specifically Vue.js or React .

• Web Accessibility & Standards: Ensure all interfaces are fully responsive and strictly compliant with accessibility guidelines ( WCAG ).

• Build & Performance Optimization: Configure and optimize modern frontend build tools and bundlers like Webpack or Vite to ensure fast loading times.

• AI & LLM Integration: Collaborate with backend and data teams to seamlessly integrate AI capabilities and Large Language Model (LLM) components into the user interface.

• DevOps & CI/CD Collaboration: Work alongside the DevOps team to integrate frontend testing and deployment steps into automated CI/CD pipelines.

• Agile Teamwork: Actively participate in all Agile/Scrum ceremonies, contributing to sprint planning, daily stand-ups, and retrospectives.

Your Profile

• Experience: 1+ years (Junior), 3+ years (Medior), or 5+ years (Senior) of professional frontend development experience.

• Tech Stack: Strong command of core web technologies and proven experience with Vue.js or React .

• Accessibility Champion: Solid understanding of WCAG standards and design systems.

• Tooling Mastery: Hands-on experience with modern bundlers ( Vite , Webpack ) and package managers.

• Agile Mindset: Comfortable working in iterative development cycles under the Scrum framework.

• Languages (Mandatory):

  • Professional proficiency (minimum 3/4) in Dutch (NL) OR French (FR) .

  • Professional proficiency (minimum 3/4) in English (EN) .

The Next Steps

1. First Contact: A quick phone call with our recruitment team to discuss your aspirations, availability, and what we can offer you.

2. Meeting: An opportunity to get to know each other better and deeply explore your professional background.

3. Business Interview: A technical and practical discussion with one of our digital experts to assess your skills and align on your career goals.