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

The SFERD works mainly in the FE part of our web applications, creating site components using React and related technologies. 

You will:

You have

• Advanced English Proficiency (B2+ reading, writing, and conversation)
• BS in Computer Science or related technical discipline or equivalent experience in Software Development in exact areas of expertise required for CM (Digital Agencies projects, Web development projects, SCRUM/Agile software projects) is a plus. 
• Experience in Digital Agencies projects, Web development projects, SCRUM/Agile software projects)
• At least 2 years working with React. Deep understanding of React.js and its fundamentals.
• Work experience managing the application's local and global states (Reducers, Redux, and Context).
• Work experience in styling React components (regular CSS, Styled components, CSS modules)
• At least 3-4 years of experience working with Front-End technologies (HTML/CSS/JavaScript)
• Excellent understanding of Javascript, including the OOP concept and how shadow DOM and DOM work.
• Work experience with cross-browser and cross-device compatibility
• Work experience with Responsive development
• Excellent knowledge of recent development practices (Mobile First, MVC, Object Oriented development)
• Work experience with automation, task builders, and pre-processing tools (eg. Webpack, Gulp, Grunt, SASS, LESS)
• Expert knowledge on integrating front-end solutions with APIs and web services.
• Knowledge of design patterns (e.g., model-view-controller, observer, object oriented, etc.).
• Knowledge of pre-processed CSS styling (SASS, LESS)
• Fluency with data transfer formats and protocols popular in web applications (eg. JSON, XML, HTTP)
• Capable of writing code compliant with modern accessibility (eg. ARIA, WCAG, Microformats, ADA, RDF) and SEO guidelines and best practices
• Capable of working with version control systems (SVN, GIT, Mercurial)
• Capable of building proof of concept prototypes
• Capable of integrate a web solution based on a Content Management System
• Capable of troubleshooting, debugging and doing root cause analysis of web applications issues
• Capable of consuming, parse and translate REST web services.

What We Offer:

• Competitive benefits packages
• Vacation, compassionate leave, sick days, and flex days
• Access to online services for families and new parents
• End of year closure days (not deducted from vacation balance)
• Diversity and Inclusion Board with 12 affinity groups
• Internal learning and development programs
• And more…

At Critical Mass, we value our employees and offer competitive compensation and benefits packages.  If you’re looking for a challenging and rewarding opportunity to significantly impact our employees' lives, we encourage you to apply for this exciting position today!

The Talent Team at Critical Mass focuses on providing the best training, onboarding, and employee experience possible! Our new hires & employees are the future of our organization, and we want to set you up for long-term success. To do so, we expect our team to work from an office a minimum of 3 -4 days a week.

The ask stems from our want to:

Strengthen opportunity for continuous learningImprove collaboration and 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 and 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 accommodations@criticalmass.com.

We are committed to fostering diversity, equity, and 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 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#avoidIf Canada based: https://www.canada.ca/en/services/finance/consumer-affairs.htmlIf U.K. based: https://www.gov.uk/consumer-protection-rightsIf Costa Rica based: https://www.consumo.go.cr/educacion_consumidor/consejos_practicos.aspx