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Critical Mass // digital experience design agency
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The Senior Front-End Developer (SFED) is responsible for designing & writing code & providing support to web applications. The SFED is able to work independently, assuming ownership for the design, interface & programming of simple & complex web sites. The SFED should also be able to provide solutions & estimates for their tasks in support of his/her Tech Lead  

The SFED works with web applications & a variety of front-end technologies including HTML5, CSS & JavaScript, & is comfortable with content management systems. 

You will:

  • Developing web applications that follow the latest web standards & conforms with leading-edge front-end technologies 
  • Works closely with Creative, Business, Technology & QA teams to ensure the solution will meet the requirements & performance targets (mobile, desktop). 
  • Owns the development of web applications & ensures they follow the overall technical architecture & design established by the technical lead 
  • Implements user & business requirements which are composed of multiple development activities 
  • Maintains up-to-date & complete documentation on projects as dictated by the capabilitys guidelines & best practices 
  • Debugs or troubleshoots complex issues in existing web applications 
  • Proactively provide feedback on policies & procedures when an opportunity for improvement exists 
  • Proactively provide guidance & support to other members of the in fulfill their tasks & improvement their performance & overall technical skills 

You have:

  • Advanced English Proficiency (B2+ reading, writing, & conversation) 
  • At least 3-4 years of experience working with Front-End technologies (ES6/HTML/CSS/JavaScript) 
  • Excellent knowledge of recent development practices (Mobile First, MVC, Object Oriented development) 
  • Fluency in at least one major mainstream JavaScript library and/or framework (eg. jQuery, Angular, React, etc...) 
  • Experience configuring FE builds (npm, gulp/grunt), a11y & web performance
  • Work experience with cross-browser & cross-device compatibility 
  • Work experience with automation & pre-processing tools (eg. Gulp, Grunt, SASS, LESS) 
  • Work experience integrating web solutions with external web services 
  • Knowledge of design patterns (e.g., model-view-controller, observer, object oriented, etc.)  
  • Experience pre-processing CSS styling (SASS, LESS) 
  • Fluency with data transfer formats & protocols popular in web applications (eg. JSON, XML, HTTP)  
  • Capable of writing code compliant with modern accessibility (eg. ARIA, WCAG, Microformats, ADA, RDF) & SEO guidelines & best practices 
  • Capable of working with version control systems (SVN, GIT, Mercurial) 
  • Capable of building proof of concept prototypes 
  • Working experience with AEM (Adobe Experience Manager) & Vue.js is a plus.
  • Capable of troubleshooting, debugging, & doing root cause analysis of web applications issues 
  • BS in Computer Science or related technical discipline; or equivalent experience as Software Developer  is a plus
  • Experience in Digital Agencies projects, Web development projects, SCRUM/Agile software projects) 

What We Offer:

  • Maternity & parental leave extra days
  • Competitive benefits packages
  • Vacation, compassionate leave, sick days, & flex days
  • Access to online services for families & new parents
  • End of year closure days (not deducted form vacation balance)
  • Diversity & Inclusion Board with 12 affinity groups
  • Internal learning & development programs
  • Enterprise-wide employee discounts
  • And more

At Critical Mass, we value our employees & offer competitive compensation & benefits packages.  If youre looking for a challenging & rewarding opportunity to make a significant impact on the lives of our employees, we encourage you to apply for this exciting position today!

The Talent Team at Critical Mass is focused on ensuring we provide the best training, onboarding, & employee experience possible! Our new hires & employees are the future of our organization, & we want to set you up for long-term success. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.

The ask stems from our want to:

Strengthen opportunity for continuous learning
Improve collaboration & team relationships.
Increase employee engagement

This work model balances the need for individual flexibility while maintaining the relentless customer focus we provide at CM. We understand that not everyone may feel comfortable with this expectation, so we ask that you please let us know immediately if there are any concerns so we can help navigate accordingly.

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

We are committed to fostering diversity, equity, & inclusion within our pool of candidates, with a target of achieving at least 50% representation from underrepresented communities.

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs and We will not use apps such as Facebook Messenger, WhatsApp, or Google Hangouts for communicating with you. We will never ask you to send us money, technology, or anything else to work for our company. If you believe you are the victim of a scam, please review your local government consumer protections guidance & reach out to them directly.

If U.S. based:
If Canada based:
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If Costa Rica based: 

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