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Critical Mass

Developer

Sorry, this job was removed at 12:23 a.m. (CST) on Wednesday, Jul 16, 2025
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In-Office
Chicago, IL, USA
70K-90K Annually
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In-Office
Chicago, IL, USA
70K-90K Annually

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The Critical Mass technology team is looking for an inspired and motivated 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're using the latest technologies including React, ES6 JavaScript, 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.

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: 

  • 3 years of relevant experience. 
  • Strong communication skills with a team-centric approach to discussion and decision making within a distributed team. 
  • Demonstrated professional project experience using JavaScript and React (ideally 2+ years).
  • Experience using HTML5 semantic markup, CSS3, and CSS.
  • 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 is preferred. 

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 

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 3 days a week.    

We continually review ranges to address skills, experience and markets. Base salaries are determined during our interview process, by assessing a number of factors that include, but aren’t limited to, a candidate’s experience and skills relative to the scope and responsibilities of the position. For current CM employees, tenure will also be a consideration.
Salary Range
$70,000$90,000 USD

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 

Critical Mass Chicago, Illinois, USA Office

225 N. Michigan Avenue, Suite 2050, Chicago, IL, United States, 60601

What you need to know about the Chicago Tech Scene

With vibrant neighborhoods, great food and more affordable housing than either coast, Chicago might be the most liveable major tech hub. It is the birthplace of modern commodities and futures trading, a national hub for logistics and commerce, and home to the American Medical Association and the American Bar Association. This diverse blend of industry influences has helped Chicago emerge as a major player in verticals like fintech, biotechnology, legal tech, e-commerce and logistics technology. It’s also a major hiring center for tech companies on both coasts.

Key Facts About Chicago Tech

  • Number of Tech Workers: 245,800; 5.2% of overall workforce (2024 CompTIA survey)
  • Major Tech Employers: McDonald’s, John Deere, Boeing, Morningstar
  • Key Industries: Artificial intelligence, biotechnology, fintech, software, logistics technology
  • Funding Landscape: $2.5 billion in venture capital funding in 2024 (Pitchbook)
  • Notable Investors: Pritzker Group Venture Capital, Arch Venture Partners, MATH Venture Partners, Jump Capital, Hyde Park Venture Partners
  • Research Centers and Universities: Northwestern University, University of Chicago, University of Illinois Urbana-Champaign, Illinois Institute of Technology, Argonne National Laboratory, Fermi National Accelerator Laboratory

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