Senior Developer, React
Critical Mass is looking for a skilled and experienced Senior Front-End Developer to join our team on a contract basis! In this role, you will work with a team of creative individuals while also collaborating closely with your Tech Lead to translate Figma designs into responsive, production-ready components using React and Tailwind CSS. This is a hands-on role where your creative flair and strong front-end fundamentals will directly shape the user experience for customers of our New York-based financial services client.
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.
Please note that this is a contract role with a projected end date of October 31, 2025.
You will:
- Develop web applications that follow the latest web standards and conform to leading-edge front-end technologies
- Work closely with the Creative, Business, Technology, and QA teams to ensure the solution meets the requirements and performance targets (mobile and desktop).
- Own the development of web applications and ensure they follow the overall technical architecture and design established by the technical lead
- Implement user and business requirements, which are composed of multiple development activities
- Maintain up-to-date and complete documentation on projects as dictated by the capability’s guidelines and best practices
- Debug or troubleshoot complex issues in existing web applications
- Proactively provide feedback on policies and procedures when an opportunity for improvement exists
- Proactively provide guidance and support to other members in fulfilling their tasks and improving their performance and overall technical skills.
You have:
- At least 5-7 years of experience working with Front-End technologies (HTML/CSS/JavaScript)
- Fluency in ReactJS & Tailwind
- Excellent knowledge of recent development practices (Mobile First, MVC, Object Oriented development)
- Work experience with cross-browser and cross-device compatibility
- Work experience with automation and pre-processing tools (e.g. Gulp, Grunt, LESS)
- Work experience integrating web solutions with external web services
- Knowledge of design patterns (e.g., model-view-controller, observer, object-oriented, etc.)
- Fluency with data transfer formats and protocols popular in web applications (e.g. JSON, XML, HTTP)
- Experience writing code compliant with modern accessibility (e.g. ARIA, WCAG, Microformats, ADA, RDF) and SEO guidelines and best practices
- Experience working with version control systems (SVN, GIT, Mercurial)
- Experience building proof-of-concept prototypes
- Experience troubleshooting, debugging, and doing root cause analysis of web application issues.
- Cloud knowledge: AWS, Azure, etc.
- Desirable: Experience in Digital Agencies projects, web development projects, SCRUM/Agile software projects.
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#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