Senior Developer

Sorry, this job was removed at 06:30 p.m. (CST) on Tuesday, May 06, 2025
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San Jose, CA
In-Office
AdTech • Marketing Tech
The Role

The Critical Mass technology team is looking for an inspired, motivated, and experienced web 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. This role will join a talented team working on MINIUSA.com. We're using the latest technologies including ES6, pub/sub architecture, and a clean component-based approach to deliver reusable, innovative, and responsive experiences. Web performance & accessibility are also key concerns because of their respective importance to user experience and perception of a premium experience. 

Our team culture thrives on a balance of collaboration and focused time, which means you won't be spending your days turning PSDs into HTML or simply pulling tickets off a JIRA queue - rather you'll be part of the design and prototyping process using data and user research feedback as input. You'll help balance the team between innovation and pragmatism. Additionally, the team has several remote members so we use screenshares and Slack as to keep communication flowing. We have a lot of fun and hope you'll join us. 

Our new hires & employees are the future of our organization, and we want to set you up for long-term successIn an effort to do so, we expect our team to work from an office a minimum of 3 days a week.    

You will: 

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

You have: 

  • Strong communication skills with a team-centric approach to discussion and decision making within a distributed team. 
  • Expertise in JavaScript - specifically ES6, Vue.js, pub/sub architecture, and REST APIs. 
  • Experience using HTML5 semantic markup, CSS3, and CSS & SVG-based animation on responsive consumer-facing websites. 
  • Full command of Git, the terminal, continuous deployment and integration, and other modern fundamentals. 
  • Strong troubleshooting ability and technical analysis skills - web performance optimization included. 
  • WCAG accessibility experience.
  •  

You may have: 

  • Experience developing within CMS platforms, preferably Adobe Experience Manager 6.4 or newer. 
  • Experience with performance optimization techniques 
  • Experience using and configuring build automation tools (Webpack, Gulp, etc.) 
  • Agency experience

What We Offer 

  • Global maternity and parental leave 
  • Competitive benefits packages 
  • Vacation, compassionate leave, personal/sick days, and flex days 
  • Access to online services for families and new parents 
  • Early Dismissal Friday’s (off at 3:00 PM local time every Friday) 
  • 13 affinity groups 
  • Internal learning and development programs 
  • Enterprise-wide employee discounts 


Critical Mass is an equal opportunity employer. 

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs criticalmass.com and us.greenhouse-mail.io. 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 and reach out to them directly.

If U.S. based: https://www.consumer.ftc.gov/articles/job-scams#avoid
If Canada based: https://www.canada.ca/en/services/finance/consumer-affairs.html
If U.K. based: https://www.gov.uk/consumer-protection-rights
If Costa Rica based: https://www.consumo.go.cr/educacion_consumidor/consejos_practicos.aspx 

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The Company
Chicago, IL
2,000 Employees
Year Founded: 1996

What We Do

We’re Critical Mass. We are 2,000 inspired humans across 14 offices, setting the right path—not just the next one—for our clients, their customers, and our own colleagues. We work with the best, Apple, Adobe, BMW, Nike, Diageo, Airbnb, BNY and many more, to power connected ecosystems that make brands stand out by driving performance with data, technology, AI, creative and media. We’re a global marketing agency founded in Canada, but digital is our home. If you know us, then you know we’re a special place that attracts big talent and tiny egos. We’re driven, uncompromising and we live our values. We’re Critical Mass, but our friends call us CM. Learn more at criticalmass.com.

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