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Critical Mass // digital experience design agency
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The Critical Mass technology team is looking for an inspired, motivated, & experienced Senior Front-End Developer to join our team. We are an experience design agency with a focus on the customer, which means that multi-discipline collaboration & prototyping are at the heart of our process. We're using the latest technologies including React, ES6 JavaScript, pub/sub architecture, & a clean component-based approach to deliver reusable, innovative, & responsive experiences. Web performance & accessibility are also key concerns because of their respective importance to user experience & perception of a premium experience.

Please note that this position is marked as a short-term W2 Project Employee.

This position is fully remote within the U.S.

You Will:

  • Collaborate with Design & UX to prototype user interactions
  • Mentor other front-end developers
  • Ensure compatibility of code across devices & viewport sizes
  • Assess & optimize page performance & WCAG compliance
  • Work with delivery team to ensure overall quality of the experience & support this with tests & documentation

You Have:

  • Strong communication skills with a team-centric approach to discussion & decision making within a distributed team
  • 5+ years demonstrated experience using Vanilla Javascript
  • 5+ years experience using HTML5 semantic markup, CSS3, & CSS & SVG-based animation on responsive consumer-facing websites
  • Full command of Git, the terminal, continuous deployment & integration, & other modern fundamentals
  • Strong troubleshooting ability & technical analysis skills - web performance optimization included
  • Familiarity with website operations & fluency in the typical tiers on a high traffic website
  • Experience with the Atlassian suite of tools - JIRA, Bitbucket, Confluence, etc.
  • WCAG accessibility experience is preferred

You May Have:

  • Adobe Experience Manager (AEM) on version 6.3 or later, or enterprise CMS
  • Experience with Vue.js or similar
  • Experience with graphQL or APIs with complex data structures
  • Experience with Webpack, or other tools used to optimize & maintain front-end build systems
  • Experience working in an agency environment
  • A -very strong- meme game

Critical Mass is an equal opportunity employer that is committed to diversity & inclusion in the workplace. We do not tolerate discrimination on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status. If you are an individual with disabilities who would like to request an accommodation, please reach out to

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