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Front End Developer

Company:
Critical Mass
Location:
San Jose, Costa Rica
Posted:
May 06, 2026
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Description:

The Front-End Developer (FED) is responsible for completing front-end tasks and providing support to AEM web applications. The FED is able to work independently in basic tasks, assuming ownership for the design and programming required. For more complex work, this individual will rely on existing designs and seek guidance from more senior team members. The FED should also be able to provide constant progress status to a senior level as needed and estimates for his tasks, that must be approved by his senior or technology lead of the current project. A FED works with web applications and a variety of front-end technologies including HTML5, JavaScript and CSS. You Will

Collaborate in implementing data exchange between application layers and AEM components

Work closely with Delivery, Creative/UX, Analytics/SEO, Business, Technology, and QA teams to ensure quality and timely web development

Translate graphical designs and wireframes into fully styled markup code for AEM components (Touch UI Dialog, HTL/Sightly, HTML, JavaScript, and CSS)

Implement technical solutions following the Capability's best practices and AEM design patterns

Debug or troubleshoot issues in existing web applications and provide solutions

Provide constructive feedback on operational processes (e.g., development/QA, Release etc.) when opportunities for improvement are identified

Ensure concise and clear documentation is maintained for all projects as dictated by each Capability's guidelines and best practices

Provide accurate status updates and task estimates to senior team members in a timely manner

Take ownership of assigned tasks and work independently while knowing when to escalate or seek guidance

Stay abreast of new technical skills, knowledge, and capabilities that can benefit project, team and personal performance

Participate in code reviews and knowledge-sharing sessions with team members

You Have

At least 2-3 years of professional experience working with Front-End technologies

BS in Computer Science or related technical discipline; or equivalent experience as Software Development in exact areas of expertise required for CM (Digital Agencies projects, Web development projects, SCRUM/Agile software projects).

Proficient experience designing and developing web applications using HTML5, CSS3, and JavaScript (ES6+)

Proven fluency and practical experience in React or similar major JavaScript libraries/frameworks (Angular, Vue.js)

Proficient knowledge of cross-browser, cross-device compatibility, and responsive web development (Mobile First approach)

Understanding of modern web development practices including MVC architecture, Object-Oriented development, and Responsive Web Design

Minimum 1+ years of hands-on experience with Adobe Experience Manager (AEM) for content and component development

Knowledge of AEM technologies: HTL (HTML Template Language), Sling Models, and JCR concepts, Clientlibs, Touch UI Dialogs (Granite UI and Coral UI) etc.

Experience debugging or troubleshooting web applications using debugging tools such as browser plugins, IDEs, or debugging proxies

Experience working with version control systems (Git, GitHub, Bitbucket)

Work experience with data transfer formats popular in web applications (JSON, XML)

What We Offer

Maternity and parental leave extra days

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

Enterprise-wide employee discounts

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 make a significant impact on the lives of our employees, we encourage you to apply for this exciting position today!

The Talent Team at Critical Mass is focused on ensuring we provide 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. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.

Critical Mass is an equal opportunity employer.

Critical Mass uses artificial intelligence in our recruitment process to enhance job postings, filter keywords during the review of prospective candidates, and, in some cases, transcribe interviews with our recruiters. Human review remains central to the process, and all hiring decisions are ultimately made by our team.

The Critical Mass Talent Acquisition team will only communicate from email addresses that use the URLs criticalmass.com, omc.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:

If Canada based:

If U.K. based:

If Costa Rica based:

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