Media Manager – Investment Billing & Operations

About the role

Critical Mass is seeking a Media Manager (Investment) to lead media billing and operational oversight. You will ensure accurate billing, manage campaign activation, and maintain strong financial controls across client accounts while collaborating with investment, account, finance, and operations teams.

Key responsibilities

• Coordinate campaign timelines and provide day‑to‑day operational support, including actualization, billing validation, and vendor invoice reconciliation.
• Manage campaign setup, buy entry, and ongoing maintenance in media systems, ensuring alignment with client‑approved budgets and Media Authorization Forms.
• Review campaign and billing inputs for accuracy, identify discrepancies, and resolve issues with internal teams and vendors.
• Support end‑to‑end media billing processes such as invoice tracking, accruals, actualization, and follow‑up on outstanding items.
• Maintain documentation and audit trails to comply with internal controls and client requirements.
• Identify process improvement and automation opportunities to increase efficiency.

Required profile

• Degree in accounting, finance, marketing, media or a related field.
• Approximately 3 years of experience in media investment, operations, billing, accounting or finance; media agency experience is a plus.
• Working knowledge of accounting principles, media billing processes, reconciliations, accruals and foreign‑currency transactions.
• Strong analytical, problem‑solving and decision‑making abilities with exceptional attention to detail.
• Excellent written and verbal communication skills and ability to work independently in a fast‑paced environment.

Required skills

• Advanced Excel (formulas, lookups, pivot tables, large data sets).
• Proficiency with Microsoft Office tools (Outlook, Word).
• Experience using Mediaocean; exposure to Prisma or similar media planning/buying platforms.

What we offer

• Maternity and parental leave extra days.
• Competitive benefits package including 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.