Senior Developer for Communications Team

Join Critical Mass's Communications team as a Senior Developer on a contract basis. You’ll create pixel-perfect implementations and responsive layouts for high-visibility websites.
This contract position runs from July 1 to September 25, 2026. As a Senior Developer with over 5 years of experience in HTML, CSS, and JavaScript, you will build modern, animation-rich marketing pages. Collaboration with Design and UX teams is key, ensuring seamless implementation of engaging campaigns.
Key Responsibilities:
• Deliver precise front-end implementations across all devices
• Create responsive layouts with rich animations using HTML and CSS
• Work on components within complex websites
• Optimize performance and ensure WCAG accessibility compliance
• Support code quality through documentation and knowledge sharing
Requirements:
• 4+ years experience in Vanilla JavaScript
• 5+ years in HTML5, CSS3, and CSS/SASS
• Proven ability in responsive design and pixel-perfec...