Senior Growth Marketer

12100 Collective is a new growth marketing agency based in NYC founded by alumni of Meta’s growth team. This senior role is responsible for owning the full funnel performance strategy and execution across a diverse portfolio of clients, focusing on eCommerce and lead generation.

Responsibilities:

• Own paid search strategy and execution across Google Ads, Microsoft Ads, and other emerging search platforms for a portfolio of eCommerce and lead-generation accounts
• Optimize toward the right objective for each client: revenue, ROAS, and CPA for eCommerce; CPL, lead-stage progression, lead quality, and offline conversions for lead generation
• Provide paid social support and partner with the Paid Social Specialist—maintain enough hands-on fluency in Meta and LinkedIn to guide strategy, pressure-test plans, and QA execution
• Own all client deliverables on your accounts: reporting, recommendations, roadmaps, QBRs, and strategic narratives
• Lead client relationships—run calls, deliver insights, manage scope and KPI targets, and act as a trusted advisor to senior marketing leaders
• Safeguard conversion tracking integrity in partnership with the Conversion Tracking / CRO lead (GTM, GA4, server-side tracking, CAPI, offline conversion imports from HubSpot/Salesforce)
• Own channel analytics on your accounts—surface insights, size opportunities, and translate data into clear recommendations; partner with the Analytics lead on dashboards and growth opportunities
• Develop and run testing programs across audiences, messaging, creative, and landing pages
• Mentor and manage the junior paid media team members, growing them from execution into more strategic contribution
• Identify new growth opportunities, platforms, and approaches for clients
• QA campaigns and tracking prior to launch—targeting, budgets, creative, links, and measurement

Requirements:

• 5–7+ years of hands-on paid search experience (Google Ads and Microsoft Ads required), with a proven track record of scaling conversion-focused campaigns
• Demonstrated experience across both eCommerce (revenue, ROAS, CPA) and lead generation (CPL, lead stage, offline conversions)—you can speak fluently to both goal sets and the measurement nuances of each
• Working proficiency in paid social (Meta required)—enough to direct strategy, QA campaigns, and partner effectively with a paid social specialist
• Strong conversion tracking background: GTM, GA4, Looker Studio, offline conversion imports (HubSpot/Salesforce), and platform pixels; comfortable diagnosing tracking issues
• 2+ years in a client-facing capacity (or in-house stakeholder) comfortable owning communication, strategy, and presenting to senior marketing leaders, including CMOs
• Extremely data-driven: comfortable analyzing large data sets in Excel/Sheets to identify drop-off, opportunity-size projects, and stack-rank by impact
• Fluency in growth frameworks; full-funnel/AARRR, growth loops, LTV:CAC, unit economics, incrementality, and structured experiment prioritization (e.g., ICE framework) with the judgment to apply the right one to each client's stage, model, and goals
• Excellent written and verbal communication with strong attention to detail
• Experience managing direct reports (1–3+)
• Technical conversion tracking depth: server-side GTM, Enhanced Conversions, CAPI
• ABM experience for B2B lead generation
• Comfort incorporating AI-assisted workflows into campaign management and analysis
• Familiarity with Linear, Notion, Google Drive, Slack, and Google Meet
• Experience launching campaigns on new or niche channels
• Prior startup or agency experience—comfortable with a fast pace and wearing multiple hats