Senior Developer

Job description

The Critical Mass technology team is looking for an inspired, motivated, and experienced Senior Developer to join our Communications team for a contract engagement. We are an experience design agency with a focus on the customer, which means that collaboration and precision execution are at the heart of our process. You'll be working on high-visibility campaign and consumer-facing websites where pixel-perfect design execution and responsive optimization are critical to delivering a premium user experience. PLEASE NOTE – This is a contract position from July 1 – September 25, 2026 You Will: - Deliver pixel-perfect front-end implementations that match design comps across all devices and viewport sizes - Build responsive campaign layouts with modern animation-rich marketing pages using modern HTML, CSS, and JavaScript - Work on individual components and page sections within robust, complex websites - Collaborate with Design, UX, and the delivery team to ensure seamless implementation of designs - Optimize page performance and ensure WCAG accessibility compliance - Jump into high-velocity production work with minimal onboarding and deliver under tight timelines - Take ownership of your...