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305 Worldwide

www.305worldwide.com

305 Worldwide is a communication company.

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Score: 55
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Job facts

Location
New York, New York
Type
Full-time
Salary
$40K – $50K
Posted
May 18, 2026
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Assistant, MX Investment

at 305 Worldwide


Job Description

Who We Are

Horizon Media, founded in 1989 by Bill Koenigsberg, is recognized as one of the most innovative marketing and advertising firms. We are headquartered in New York City, with offices in Los Angeles and Toronto. A leader in driving business solutions for marketers, Horizon is known for its highly personal approach to client service. Renowned for its incredible culture, Horizon is consistently named to all the prestigious annual Best Places to Work lists published by Fortune, AdAge, Crain’s New York Business and Los Angeles Business Journal. Together we are building a place of belonging.

At Horizon, we understand the value that different perspectives can bring to our clients and culture, so we strive for an environment where our employees feel welcomed, safe and empowered. We value YOU and believe that your authentic voice and unique perspective allows us to create a more rewarding culture, and experience, together.

Our simple recipe for success? We hire talented people (thinkers, doers, dreamers, makers), challenge them and give them every opportunity to grow.

Media Excel (MX) is Horizon Media’s principal-based buying arm focused on delivering value and financial solutions for clients. MX identifies emerging market trends and makes investments with media, tech, and data partners to deliver advantageous rates and terms to Horizon clients.

What You’ll Do****

Media Investment and Negotiation – 15%

  • Assist in the negotiation of pricing with media vendors across multiple media types

  • Manage communication with vendors to ensure timely receipt of schedules and plans

  • Collaborate with MX team to ensure vendor plans meet all pricing and guideline requirements and manage follow ups with vendors as needed

Campaign & Data Management & Execution - 40%

  • Assist in management of day-to-day communication with internal teams as well as external vendors

  • Schedule inputs and QA in SBMS and Core

  • Assist with tagging and trafficking of digital buys

  • Request prelogs form networks in advance of upcoming week to ensure schedules will run as planned and alert internal team to any variances

  • Assist in evaluation and acceptance of makegoods, ADU’s and plan changes

Billing Reconciliation – 15%

  • Check that invoices are input correctly by the billing department

  • Request any missing invoices from vendors

  • Resolve billing discrepancies

  • Work with your manager and Ops to make sure all billing adjustments are complete before client billing is approved

Reporting & Analysis - 10%

  • Collect and enter TV post-log data into Core/SBMS on a weekly basis for reporting

  • QA reporting to make sure post log airings match schedules purchased

  • Create and maintain budget trackers to ensure strong pacing/delivery

Learning & Development - 15%

  • Advance knowledge and learn about the media industry, Horizon Media, and our clients

  • Further abilities with Microsoft Office Suite and other proprietary Horizon tools

  • Participate in Horizon’s Media 101 training program and other syndicated and proprietary training sessions (i.e. Excel Basics, Business Writing, Presentation Skills, and more).

  • Learn about the various departments at HMI and how each work together

  • Attend and participate in vendor and internal meetings, where applicable

  • Develop and maintain knowledge and understanding of industry trends and new technologies that affect the buying discipline

Who You Are

  • Hungry to learn more and further your knowledge of the media landscape

  • Interested in the linear and digital landscape

  • A strong, effective communicator

  • A problem solver with the ability to develop creative solutions

  • Detail oriented with strong organizational skills

  • An effective time manager, comfortable working with multiple timelines and deliverables

  • Flexible in working both independently and with a team

  • Takes pride in ownership of work and demonstrates accountability

  • Able to thrive in an agile, fast paced environment and seek out feedback proactively

  • Results and solutions oriented; consistently motivated, proactive, and resourceful

  • A supporter of and advocate for diversity, equity and inclusion

Preferred Skills & Experience

  • Bachelor’s degree and/or relevant work or internship experience

  • Proficiency working within Microsoft Excel and PowerPoint

  • Experience working in the advertising industry preferred

  • Proficient in math

  • Confidence within Microsoft Office Suite especially Excel and PowerPoint

  • Organization, time management, communication, and written skills

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Horizon Media is proud to be an equal opportunity workplace. We are committed to equal employment opportunity regardless of race, color, ancestry, religion, sex, national origin, sexual orientation, age, citizenship, marital status, disability, gender identity or Veteran status. We also consider qualified applicants regardless of criminal histories, consistent with legal requirements.

Salary Range

$40,000.00 - $50,000.00

A successful applicant’s actual base salary may vary based on factors such as individual’s skill sets, experience, training, education, licensure/certifications, and qualifications for the role.__As an organization, we take an aptitude and competency-based hiring approach.__ We provide a competitive total rewards package including a discretionary bonus and a variety of benefits including health insurance coverage, life and disability insurance, retirement savings plans, company paid holidays and unlimited paid time off (PTO), mental health and wellness resources, pet insurance, childcare resources, identity theft insurance, fertility assistance programs, and fitness reimbursement.