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Critical Mass // digital experience design agency
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The Front-End Developer (FED) is responsible for completing front-end tasks & providing support to web applications. The FED is able to work independently in basic tasks, assuming ownership for the design & programming required. For more complex work, this individual will rely on existing designs & seek guidance from more senior positions. The FED should also be able to provide constant progress status to a senior level as needed & estimates for his tasks, that must be approved by his senior or technology lead of the current project.

A FED works with web applications & a variety of front-end technologies including HTML5, JavaScript & CSS.

You will: 

  • Collaborate in implementing data exchange between application layers via AJAX
  • Works closely with Creative, Business, Technology & QA teams to ensure quality & punctual web development
  • Translates graphical designs & wireframes into fully styled markup code
  • Implements technical solutions following the Capabilitys best practices
  • Debugs or troubleshoots issues in existing web applications
  • Provide feedback on policies & procedures when an opportunity for improvement exists
  • Ensures concise & clear documentation is maintained by all peers for the projects as dictated by each Capabilitys guidelines & best practices. 

You have: 

  • English Proficiency (B2+, C1 reading, writing, & conversation)
  • At least 2 years of experience working with Front-End technologies.
  • Knowledge of Cross-browser & Responsive development
  • Work experience designing & developing web applications using HTML, CSS & JavaScript.
  • Understanding of recent development practices (Mobile First, MVC, Object Oriented development)
  • Work experience with cross-browser & cross-device compatibility
  • Proficiency using design tools (such as Photoshop, Illustrator, Figma & Sketch)
  • Fluency in at least one major mainstream JavaScript Vainilla.
  • Knowledge of accessibility, data structures, metrics & KPI's.
  • Knowledge of ETL, Test & target.
  • Knowledge of AB testing.
  • Experience debugging or troubleshooting web applications, preferably using debugging tools such as browser-plugins, IDEs or debugging proxies.
  • Understanding of web design patterns (e.g., model-view-controller, observer, etc.) & modern web design practices (eg. Responsive Web Design).
  • Work experience with data transfer formats popular in web applications (eg. JSON, XML)
  • Knowledge in accessibility & SEO best practices.
  • Knowledge in CSS pre processors.

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 from 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.

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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