Senior Front End Developer

5 Days ago • 5 Years +
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About the job

SummaryBy Outscal

Senior Front End Developer needed with 5+ years experience in JavaScript, HTML, and CSS. Must have strong expertise in vanilla JavaScript and experience with Adobe Experience Manager (AEM). Knowledge of React and modern front-end frameworks required.

Critical Mass is currently looking for a Senior Front End Developer to join our growing team. You will be working with frontend JavaScript, HTML, and CSS (latest versions) as you collaborate with Adobe Experience Manager and the Adobe Marketing Cloud. This role offers the opportunity to work with world-class clients on a class-leading CMS marketing platform. Critical Mass is a creative company at heart that uses technology to deliver amazing experiences for our clients. The marketing industry is constantly evolving and, as such, provides the opportunity to work on new high-exposure projects using newer technologies. We work hard, have a lot of fun along the way and hope you’ll join us.


You will:

  • Use modern front-end frameworks and digital pattern libraries to rapidly prototype with code.
  • Deliver solutions that balance technical and business requirements by choosing the best mix of cutting-edge technology.
  • Work with project teams to understand business and user requirements.
  • Exercise quality control on all aspects of web development to maintain high coding standards and practices.

You have:

  • Minimum of 5 years of proficiency in JavaScript, HTML, and CSS (latest versions).
  • Strong expertise in vanilla JavaScript, as key components are built with JavaScript and HTML5.
  • Experience with Adobe Experience Manager (AEM) or another CMS (e.g., WordPress) would be an asset.
  • Knowledge of React and experience with modern front-end tools and frameworks.
  • Experience with management frameworks and tools such as Jira, GitHub, and GitLab.
  • Experience working with package managers and automation tools like npm, gulp, and grunt.
  • Demonstrated understanding of Responsive Web Design principles.
  • Experience diagnosing and solving cross-browser/cross-platform issues.
  • Experience working with cross-functional and cross-office teams.
  • Exceptional attention to detail is crucial.
  • Must demonstrate patience and flexibility.
  • Agency experience would be an asset

What We Offer

  • Global maternity and parental leave
  • Competitive benefits packages
  • Vacation, compassionate leave, wellness days, and flex days
  • Access to online services for families and new parents
  • Extensive winter holiday office closures
  • Summer Fridays (off at 3:00 PM local time every Friday)
  • Diversity and Inclusion Board with 15 affinity groups
  • Enterprise-wide employee discounts

Our new hires & employees are the future of our organization, and 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 4 days a week.

About The Company

Critical Mass is a team of 1,800 inspired folks based in 12 offices around the world, providing full-service digital capabilities for the greatest brands on Earth. Our secret sauce is our uncompromising design standards, our relentless focus on customers, and an ability to put powerful new technologies to work for our clients.


We work with the best—Apple, Nike, Mars Wrigley, Nissan, Diageo, Airbnb, BMW, BNY Mellon, Johnson & Johnson, and many more—brands who strive for connected digital ecosystems and unparalleled experiences. We help them get there by gaining deep insight into their consumers and orchestrating data, AI, design, media, and tech stacks around human stories.


We’re a global agency founded in Canada, but digital is our home. If you know us, then you know we’re a special, quirky place that attracts big talent and tiny egos. (We actually give out a “so f-n nice” award—lots of them). But just because we’re friendly doesn’t mean we’re not a force to be reckoned with. We’re driven. Relentless. And we live our values. We’re Critical Mass, but our friends call us CM. Please call us CM!

California, United States (Hybrid)

San José Province, Costa Rica (Hybrid)

California, United States (Hybrid)

San José Province, Costa Rica (Hybrid)

Bogota, Colombia (Hybrid)

Bogota, Colombia (Hybrid)

Bogota, Colombia (Hybrid)

San José Province, Costa Rica (Hybrid)

Alberta, Canada (Hybrid)

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