Contract Senior Developer at Critical Mass

Join the Critical Mass Communications team as a Contract Senior Developer for an exciting engagement focused on high-visibility projects. Leverage your expertise in front-end technologies to create pixel-perfect designs and responsive consumer websites.
This contract role runs from July 1 to September 25, 2026, where you'll be responsible for delivering top-notch front-end implementations. Your responsibilities will include collaborating with creative teams, optimizing performance, and contributing to the seamless execution of high-profile campaigns.
Key Responsibilities:
• Deliver pixel-perfect front-end implementations across all devices
• Build responsive, animation-rich campaign layouts using HTML, CSS, JavaScript
• Collaborate with Design and UX for seamless design implementations
• Optimize performance and ensure WCAG accessibility compliance
• Support the team with coding clarity and documentation
Requirements:
• 4+ years of Vanilla JavaScript experien...