---
title: 'Invoice Reconciliations Manager (Media) at Critical Mass'
canonical: 'https://feeny.ai/job/invoice-reconciliations-manager-media-critical-mass-san-jose-vy4rsm08gvma'
type: 'job'
last_seen: '2026-11-06'
---

# Invoice Reconciliations Manager (Media) at Critical Mass

- **Company:** Critical Mass
- **Location:** San Jose, CA
- **Posted:** 2026-09-23
- **Last confirmed live:** 2026-11-06
- **Apply:** https://job-boards.greenhouse.io/criticalmass/jobs/8114078

## Job description

Join Critical Mass as our Invoice Reconciliations Manager (Media), with a focus on media billing and operational oversight. In this role, you will lead and oversee key media investment processes, ensuring accurate and timely billing, effective campaign management, and strong financial controls across client accounts. You will partner closely with investment, account, finance and operations teams to resolve complex issues, improve processes, and ensure campaign and billing activities are delivered accurately and efficiently. If you have strong analytical skills, exceptional attention to detail, experience in media investment or billing, and thrive in a fast-paced environment, we invite you to apply and become a key part of our team.

The ideal candidate should be comfortable working in alignment with Eastern Time (ET).

You Will

- Own the coordination of campaign timelines and provide day-to-day operational support to the investment team throughout campaign activation, including actualization, billing validation and vendor invoice reconciliation.
- Manage campaign setup, buy entry and ongoing maintenance across relevant media systems, ensuring all activity aligns with client-approved budgets, Media Authorization Forms (MAFs) and agreed buying parameters.
- Review campaign and billing inputs for accuracy, identify discrepancies and work proactively with internal teams and vendors to resolve issues in a timely manner.
- Partner with investment, account, finance and operations teams to provide accurate campaign status updates, billing forecasts and reconciliation information.
- Support the end-to-end media billing process, including invoice tracking, accruals, actualization and follow-up on outstanding items.
- Maintain accurate documentation and audit trails for campaign and billing activity, ensuring processes comply with internal controls and client requirements.
- Identify opportunities to improve processes, enhance data quality and support automation initiatives that increase efficiency across client and campaign deliverables.
- Serve as a knowledgeable point of contact for billing-related queries, escalating risks and exceptions appropriately and communicating their potential impact on campaign delivery or financial accuracy.

You Have

- A diploma or degree in accounting, finance, marketing, media or a related field.
- Approximately 3 years of experience in media investment, media operations, billing, accounting, finance or a related environment; experience within a media agency is an advantage.
- Working knowledge of accounting principles, media billing processes, reconciliations, accruals and foreign currency transactions.
- Strong understanding of campaign setup, media buying workflows and the relationship between media authorizations, approved budgets, buys and vendor invoices.
- Strong proficiency in Excel, including the ability to work confidently with formulas, lookups, pivot tables and large data sets; proficiency with Microsoft Office tools, including Outlook and Word.
- Experience using Mediaocean is required, preferably with exposure to Prisma or other media planning, buying, trafficking or financial management platforms.
- Strong analytical and problem-solving skills, with the ability to investigate discrepancies, troubleshoot issues and drive them through to resolution.
- Strong decision-making and judgment, with the ability to assess issues, determine appropriate next steps and escalate when required.
- Exceptional attention to detail and a high level of accuracy when handling financial, campaign and billing data.
- Excellent written and verbal communication skills, with the confidence to collaborate across internal teams and communicate effectively with vendors.
- Strong organizational and prioritization skills, with the ability to manage multiple campaigns, deadlines and competing requests in a fast-paced environment.
- A proactive, self-motivated approach and the ability to work independently while taking ownership of responsibilities and exercising sound judgment.

-

## 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
- 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.

The Ask Stems From Our Want To

Strengthen opportunity for continuous learning

Improve collaboration and team relationships.

Increase employee engagement

This work model balances the need for individual flexibility while maintaining the relentless customer focus we provide at CM. We understand that not everyone may feel comfortable with this expectation, so we ask that you please let us know immediately if there are any concerns so we can help navigate accordingly.

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: 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

## About Critical Mass

## Company Overview
- **One-liner**: Critical Mass is a digital experience design agency that creates connected digital ecosystems for global brands through design, technology, data, and AI.
- **Entity Type**: Private (subsidiary of Omnicom Group Inc., a publicly traded holding company)
- **Headquarters**: Calgary, Alberta, Canada
- **Founded**: 1996
- **Founders**: Not publicly available

## Core Business
- **Primary industry**: Advertising Services / Digital Experience Design & Marketing
- **Target customers**: B2B, Enterprise (serves globally renowned brands such as Apple, Adobe, BMW, Nike, Diageo, Airbnb, and BNY)
- **Mission or purpose statement**: “We create connected digital ecosystems through design and technology” – powering brand differentiation with performance driven by data, technology, AI, creative, and media.

## Products & Services
- **Intelligence & Insights**: Data-driven research and analytics to uncover customer behavior and market opportunities.
- **Brand & Creative**: Strategy, visual identity, and storytelling across digital and traditional channels.
- **Experience Design**: User experience (UX) and interface design for web, mobile, and connected products.
- **CRM & Loyalty**: Customer relationship management programs and loyalty platform design.
- **Social**: Social media strategy, content creation, and community management.
- **Technology**: Custom software development, platform engineering, and system integration.
- **Data & AI**: Advanced analytics, machine learning models, and AI-powered personalization.
- **Performance Marketing**: Paid search, social advertising, and programmatic media buying.
- **Media**: Media planning, buying, and optimization across channels.
- **Automation**: Marketing automation and workflow orchestration solutions.

## Market Standing
- **Valuation/Market Cap**: Not disclosed (subsidiary of Omnicom Group Inc.)
- **Key Metric**: Annual Revenue of $300M (2024‑2025 data)
- **Notable Investors/Partners**: Parent company Omnicom Group Inc. (NYSE: OMC); key clients include Apple, Adobe, BMW, Nike, Diageo, Airbnb, BNY Mellon.
- **Growth Signals**: Headcount of ~1,448 employees (LinkedIn, 2025) with +6.9% YoY growth; 12–14 offices across North America, Europe, Latin America, and Asia; award wins – Fast Company’s 100 Best Workplaces for Innovators, Digiday’s Most Innovative Agency; in-house development program for emerging talent (no experience required).

## Competitive Advantages
- **Global footprint** with offices in 13+ countries enabling cross‑market campaigns.
- **Award‑winning creative and technical capabilities** recognized by industry peers.
- **Deep client relationships** with iconic brands across multiple verticals (tech, auto, luxury, finance).
- **In‑house development program** for emerging talent, lowering the barrier to entry and building a pipeline of skilled practitioners.
- Culture described as “big talent and tiny egos,” emphasizing collaboration and low politics.

## Strategic Focus
- Continued investment in **AI, data, and automation** to deliver connected ecosystems that drive measurable performance.
- Expanding **media and performance marketing** capabilities alongside traditional creative and design.
- Growing **global delivery network** (e.g., Costa Rica, Colombia, Japan) to offer cost‑effective scale.
- Nurturing **emerging talent** through internal programs to sustain a pipeline of digital‑first creators.

## Why Work Here
- **Culture**: “The people make the place” – a collaborative, low‑ego environment that attracts “digitally‑minded creative folks.” Fast Company named it one of the 100 Best Workplaces for Innovators.
- **Work policy**: In‑office (based on Built In profile and office‑centric job postings); 12 global offices (Vancouver, Calgary, Toronto, New York, Chicago, Los Angeles, London, São Paulo, Tokyo, San José, etc.).
- **Notable perks**: In‑house development program for emerging talent (“No experience required”); opportunities to work with world‑class brands; “equal parts laughter and resolve” in team culture.
- **Engineering/creative culture**: Cross‑functional teams (strategy, design, technology, media) with a flat hierarchy; employees report high autonomy on projects.

## Sources
1. [criticalmass.com](https://www.criticalmass.com/)
2. [criticalmass.com/jobs](https://www.criticalmass.com/jobs)
3. [linkedin.com/company/critical-mass](https://www.linkedin.com/company/critical-mass)
4. [builtin.com/company/critical-mass](https://builtin.com/company/critical-mass)
5. [job-boards.greenhouse.io/criticalmass](http://job-boards.greenhouse.io/criticalmass)

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