Senior Manager, New Stream - Sell Side

Job Description: The New Stream Media team at dentsu leads strategy, activation, and optimization for a large Retail Media client. We are looking for a dynamic, organized, and highly collaborative leader to join our growing team. This role will report to the Group Director, Commerce & Retail Media. As a Senior Manager, you will serve as the primary strategic partner across your client portfolio, responsible for developing growth strategies, identifying opportunities, solving business challenges, and strengthening client and partner relationships. You will play a critical role in supporting the planning, execution, and ongoing management of retail media campaigns and supplier partnerships, ensuring work is delivered accurately, on time, and with a high level of quality. This role is ideal for someone who can create strong governance and communication practices, manage multiple priorities, and proactively troubleshoot issues ranging from campaign delivery needs to more complex operational or technical challenges. Responsibilities: Serve as the strategic account lead across assigned accounts, translating client priorities and business challenges into account strategies and growth opportunities Own account and campaign workstreams, ensuring timelines, deliverables, documentation, stakeholder follow-ups, and key milestones are managed effectively Build strong relationships and coordinate effectively across suppliers, retailers, vendors, Sales, Planning, Analytics, Activation, and Account Management teams to ensure seamless communication and execution Lead day-to-day campaign execution across setup, QA, launch readiness, pacing, and reporting in partnership with internal teams and external partners Monitor campaign performance, identify risks or opportunities, and support development of performance recaps and optimization recommendations Troubleshoot client, supplier, and campaign-related issues, escalating when needed and driving timely resolution across stakeholders Contribute to process improvement initiatives, training materials, documentation, and best practice development Provide guidance to junior team members and help reinforce consistent ways of working across assigned accounts Support ad hoc strategic and operational initiatives in a fast-paced, evolving environment Qualifications Bachelor’s degree in Marketing, Business, Communications, Analytics, or a related field preferred 4+ years of digital performance marketing experience in eCommerce, retail media, search, programmatic, or a related field 2+ years of experience leading retail media or eCommerce programs preferred Experience working with retail media platforms, DSPs, search platforms, or related digital advertising technologies preferred Strong project management and organizational skills, with the ability to manage multiple priorities, competing deadlines, and evolving business needs Strong business acumen and problem-solving skills, with the ability to identify opportunities, resolve issues, and drive solutions to completion Strong written, verbal, presentation, and storytelling skills, with the ability to communicate effectively across stakeholders and teams Experience developing campaign recaps, performance reports, and optimization recommendations Strong analytical mindset with the ability to interpret performance data and translate insights into actionable business recommendations Advanced proficiency in Microsoft Excel and PowerPoint; experience with formulas, pivot tables, and large datasets preferred Ability to work independently while collaborating effectively within a team environment Enthusiasm for retail media, eCommerce, and the evolving digital advertising landscape Additional Information: At dentsu, we believe great work happens when we're connected. Our way of working combines flexibility with in-person collaboration to spark ideas and strengthen our teams. Employees who live within a commutable distance of one of our hub offices, currently located in Chicago, metro Detroit, Los Angeles, and New York City, are required and expected to work from the office three days per week (two days per week for employees based in Los Angeles). Dentsu may designate other Hub offices at any time. Those who live outside a commutable range may be designated as remote, depending on the role and business needs. Regardless of your work location, we expect our employees to be flexible to meet the needs of our Company and clients, which may include attendance in an office. The annual salary range for this position is $82,000-$110,000. Placement within the salary range is based on a variety of factors, including relevant experience, knowledge, skills, and other factors permitted by law. Benefits available with this position include: Medical, vision, and dental insurance, Life insurance, Short-term and long-term disability insurance, 401k, Flexible paid time off, At least 15 paid holidays per year, Paid sick and safe leave, and Paid parental leave. Dentsu also complies with applicable state and local laws regarding employee leave benefits, including, but not limited to providing time off pursuant to the Colorado Healthy Families and Workplaces Act, in accordance with its plans and policies. For further details regarding Dentsu benefits, please visit To begin the application process, please click on the "Apply" button at the top of this job posting. Applications will be reviewed on an ongoing basis, and qualified candidates will be contacted for next steps. Location: New York Brand: Iprospect Time Type: Full time Contract Type: Permanent Dentsu is committed to providing equal employment opportunities to all applicants and employees. We do this without regard to race, color, national origin, sex , sexual orientation, gender identity, age, pregnancy, childbirth or related medical conditions, ancestry, physical or mental disability, marital status, political affiliation, religious practices and observances, citizenship status, genetic information, veteran status, or any other basis protected under applicable federal, state, or local law. Dentsu is committed to providing reasonable accommodation to, among others, individuals with disabilities and disabled veterans. If you need an accommodation because of a disability to search and apply for a career opportunity with us, please send an e-mail to View email address on click.appcast.io by clicking on the link to let us know the nature of your accommodation request and your contact information. We are here to support you. Can’t find a suitable job? Sign up for job alerts tailored to your interests and be first in line for new opportunities. About dentsu For over 120 years, innovation has been a core tenet of our offering – exploring new ways to reach, engage and nurture relationships with audiences. Together we drive a multiplier effect for clients at a global scale, through the development of Integrated Growth Solutions that are underpinned by our promise to clients: innovating to impact. Be a force for good. Sustainability is a vital part of our business and an important area of focus for our clients. We’re leading the way – helping to build a more sustainable planet. Dream loud. In this moment of transformation, we need our people to be fearless, embracing change and ambiguity, driven by the love for their work and excitement for the future. Team without limits. We create opportunities for connection and collaboration between our colleagues and clients, building a sense of belonging and having some fun along the way. Find out more about us Who we are Our Social Impact Our work