Critical Mass

Sunnyvale, CA 

Senior Developer- Apply here!

The Critical Mass technology team is looking for an inspired, motivated 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 and prototyping are at the heart of our process. We use some of the most popular tools to build and deliver our work, but it all boils down to HTML, CSS, and JS for a front-end developer. A strong grasp of “Vanilla” Javascript beyond jQuery will help you greatly in this role. Experience with performance or accessibility is a bonus. Ideal candidates don’t necessarily need to be an expert in these technologies, but some experience with them and a deep passion to improve your craft is a must.

The role will be mentored by a Tech Lead and work with a larger tech team, so you won’t be on an island. We thrive on a balance of collaboration and focused time which means you won’t be spending all your time turning PSDs into HTML – rather you’ll be part of the design and prototyping process. Critical Mass is a creative company at heart that uses technology to deliver amazing experiences to our clients and data to get better over time.  We have a lot of fun and hope you’ll join us.


  • Rapid prototyping with code, using modern front-end frameworks and a digital pattern library
  • Deliver solutions balancing technical and business requirements. Experience has taught you what works. Your long history in the game helps you choose the best mix of proven and cutting-edge technology
  • Interacting with project teams to understand business and user requirements
  • Maintaining high coding standards and practices and exercise quality control on all aspects of web development
  • Problem-solving in all areas of web development


  • 5+ years demonstrated development experience with hand-coding advanced HTML, CSS, HTML5, CSS3, and JavaScript
  • Experience developing with modern front-end tools and frameworks
  • Package manager and automation tool experience (npm, gulp, grunt)
  • Demonstrated understanding of Responsive Web Design principles
  • Proficiency with Semantic HTML Markup
  • Accessibility knowledge (WCAG 2.0 Level AA) preferred
  • Experience diagnosing and solving cross-browser/cross-platform issues
  • Experience working with cross-functional and cross-office teams

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