Senior Account Manager

Critical Mass is hiring a Sr Account Manager to join a dynamic and collaborative team where you’ll work directly with  high-profile clients on digital marketing initiatives that make a real impact. As a Sr. Account Manager, you’ll be empowered to lead, innovate, and grow—shaping campaigns that matter while thriving in a small, close-knit office culture that values creativity, teamwork, and professional development. If you’re ready to take ownership of client relationships and drive success in a supportive environment, this is the opportunity for you.

---

You Will:

• Serve as the primary day to day contact for client communications and campaign updates
• Lead the execution of large scale email marketing programs across multiple brands
• Run regular status meetings, document next steps, and drive accountability with internal and client teams
• Coordinate resources across creative, strategy, technology, and offshore support for seamless project delivery
• Manage project timelines, proactively flag risks, and resolve issues to keep campaigns on track
• Facilitate creative review cycles and ensure client feedback is integrated into deliverables
• Oversee quality assurance, troubleshooting, and final approvals to ensure flawless execution
• Foster strong, collaborative relationships with both internal and external partners

 

You Have:

• 3–7 years of account management, client service, or related agency experience (digital marketing or email program experience preferred)
• Proven ability to lead meetings, manage projects independently, and serve as a trusted client advisor
• Polished communication skills—both written and verbal—with the ability to present updates and complex information clearly
• Strong organizational skills with exceptional follow through and attention to detail
• Proactive mindset, you anticipate needs, identify risks early, and act quickly to resolve issues
• A desire to collaborate and be a team player, eager to support colleagues and drive collective success
• Technical acumen or curiosity; familiarity with email marketing platforms (e.g., Marketo, Adobe) is helpful, but a willingness to learn is most important

 

What We Offer: 

• Global maternity and parental leave 
• Competitive benefits packages 
• Vacation, compassionate leave, sick days, and flex days 
• Access to online services for families and new parents 
• Diversity and Inclusion Board with 12 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 in office a minimum of 3 days a week. 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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, 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: 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