Senior Manager, Experience & Activation (SEM)

Job description

Senior Manager, Experience & Activation (SEM)
Join to apply for the
Senior Manager, Experience & Activation (SEM)
role at
Assembly Global
Overview
We are Assembly – and we’re not like the rest.

We’re the modern alternative agency, bringing together industry-leading data, talent, and tech to Find the Change That Fuels Growth for the best brands on the planet.

Our diverse, global community of over 1,600 passionate experts combines global thinking with local expertise in more than 20 markets worldwide.

We use STAGE, Assembly’s proprietary, privacy-centric data solutions platform, to surface insights that transform into actionable brand opportunities.

We’re at the cutting edge of new media, technology, and platforms embedded in the lives of today’s consumers, and we’re committed to Leave the World Better Than We Found It through measurable social and environmental impact work.


We were named The Drum’s APAC Media Agency of the Year in 2021
What you’ll do
What you’ll do on any given day
Strategic Responsibilities
Partner with Planning & Strategy team to translate briefs into clear SEM objectives
Identify gaps/opportunities in keyword themes, new product launches, and tentpole integration
Validate BU-specific priorities and support budget modelling for SEM vs other channels
Ensure alignment on KPIs & Performance goals: CPV, CTR, ROAS, Revenue, Registration
Contribute to the development of the SEM strategy slide in the media plan
Recommend budget splits (brand vs generic vs PMAX), audience strategies, ad extensions, and test ideas
Integrate insights from Google, quarterly business reviews, and platform betas into ongoing planning
Stay updated with platform changes and propose pilot programs for early adoption
Proactively work with partners for new test and learn opportunities to bring to the client
Cross-functional & Stakeholder Management
Serve as SEM subject matter expert across internal client teams, ASM teams, and platform partners
Escalate blockers or opportunities tied to budget, performance or technical issues
Partner with global, regional, and local teams to ensure SEM strategies are consistent, scalable, and tailored to market needs
Execution Oversight
Ensure budget and bid strategies are accurately implemented (tROAS, Max Conversion, etc.)
Validate setup to ensure cross-market consistency
Coordinate with analysts, local teams (e.g., Korea), and offshore support teams for market-specific adjustments such as language and localized promotions
Manage POE timelines and processes, ensuring proper QA on screenshots and accuracy of reporting for POWD and POE documentation
Help team to prioritise tasks, setups, deliverables and communicate them to client
Performance Management & Reporting
Lead weekly and quarterly review of SEM performance (traffic, conversions, efficiency, budget pacing)
Approve budget reallocation across BUs based on pacing & performance trends
Define and approve testing roadmaps including ad copy A/B testing, audience segmentation, and device bid modifiers
Identify underperforming trends and provide actionable recommendations to improve outcomes
Does this sound like you?
Minimum 7 years in media agency-side roles, with at least 3 years in a people-management and managerial role
Fluent English communication, verbal and written
Experienced in integrated media planning, with a strong understanding of digital channels activation
Deep mastery of Google Ads, including SA360, Performance Max and Shopping campaigns and cross‐platform SEM expertise across Microsoft Ads and Naver
Skilled in automation and AI-driven search, with hands-on experience in bid strategies (tROAS, Max Conversion), campaign automation, and integration with GA4/Adobe Analytics for optimization
Experienced in feed management and dynamic ads, including product feeds, Google Merchant Center, and Dynamic Search Ads (DSA) campaigns
Strong in budget pacing models and forecasting accuracy across product segments and markets
Advanced Excel / Looker Studio / Tableau / Adobe Analytics reporting skills
Familiarity with incrementality tests (geo-experiments, brand vs generic testing)
Significant proven experience in working with multiple stakeholders like media partners and external agencies
Demonstrable experience in translating client objectives into feasible, well thought-out digital strategies with a focus towards performance marketing
Strong knowledge of the APAC media landscape to adapt and localise global and regional strategies
Proven track record in managing complex accounts with multiple stakeholders across multiple time-zones effectively while developing strong client relationships
Experience leading large scale account teams across different offices and time zones
Personality Attributes
Team leader, collaborator, contributor
Proactive, motivated, self-starter
Out-of-the-box creative thinker
Confident, responsible
Process-driven, organised
Never stop learning attitude
Why Assembly?
We’re part of Stagwell, the challenger network built to transform marketing.

We’re nimble, smart, and digital-first, and we’re growing to take on the biggest legacy hold cos.


We care about your growth – competitive salaries, annual compensation reviews, and personal development plans.


We recognize and celebrate your success through company meetups, employee recognition programs, and more.


We’re a people-first organization with Flexible Time Off and caregiver/ parental leave policies.


We support social and environmental impact with dedicated Impact Champions globally.


We have employee resource groups to guide the agency toward inclusivity and diversity.


Sounds like the right role for you?

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