Critical Mass is hiring a

Senior Email Developer (Marketo)

Bogotá, Colombia

The Senior Email Developer (SED) is responsible for designing and writing code and providing support to build also responsive email designs. They need to know HTML, CSS and media query, the SED is able to work independently tasks, assuming ownership for the design and programming required. SED should handle the code very well, to developing a responsive email, this individual will rely on existing designs. The SED should also be able to provide accurate estimates for his tasks. Guide and inspire new hires.

You will: 

  • HTML and CSS oriented for email development.
  • Propose solutions and provide estimations on projects.
  • Work with the design team, tech leads and PMs.
  • Ensure emails follow best practices.
  • Develop responsive email design.
  • Coach and support other Email Developers in fulfill their tasks and improving their skills.
  • Ensure that implementation matches the design.
  • Ability to work under tight deadlines.
  • Create and update templates (basic to complex level).
  • Analyze complex emails testing to improve solutions on environments issues.
  • Knowledge on ADA implementations for emails.
  • Perform code reviews; develop and adhere to coding standards
  • Optimize Images, HTML, CSS code to achieve maximum performance with minimum size.
  • Ensure desktop and browsers engines compatibility.
  • Research online marketing resolutions.
  • Stay abreast of ever-emerging technologies and techniques
  • Being aware and having a proactive, mindful “eye” to problem identification and mitigation (associated with execution of HTML Email Campaigns); capable and confident problem-solving skills.
  • Using the following programs Adobe Creative Suite (Dreamweaver and Photoshop), MailChimp, HTML/CSS Skills.

You have:

  • English Proficiency (B2+/C1 reading, writing, and conversation).
  • At least 3 - 4 years email specific development experience.
  • Must have digital portfolio, covering dynamic email samples.
  • Familiar with ad publishers (eg. Marketo, Salesforce, Engage, Silverpop, etc)
  • Knowledge on pixel perfect implementation on htmls.
  • Knowledge for MSO compatibility and issues related fixes.
  • ADA compliance knowledge.
  • Dark mode and fixes.
  • Experience dev skills in HTML, CSS
  • Concept of live text vs images
  • Knowledge in W3C Standards (or able to learn quickly about them).
  • Image optimization
  • Independent, responsible, and proactive with the ability to learn and achieve superior results.
  • Understanding of media queries for responsive layout
  • Experience working with mobile and web templates.
  • Basic HTML and simple/nested table structure
  • Hands on QA experience utilizing Litmus or similar.
  • Photoshop proficiency required to manipulate assets.
  • Detail oriented, organized, and the ability to meet deadlines while working with some projects at the same time.
  • Proven experience with modern web standards and cross-browser compatibility issues
  • Familiarity with MSO code.


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 form 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 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. 

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

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 and 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:
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