Senior Growth Marketing Manager

Flex is seeking a Senior Growth Marketing Manager to help scale the engine that drives our next stage of growth. As a design-forward brand transforming the modern period care category, Flex is expanding rapidly across ecommerce and retail channels. The ideal candidate is a hands-on operator who uses modern tools, including AI, to move faster, test more ideas, and uncover insights that translate directly into revenue growth.This role will oversee the performance of paid acquisition for digital marketing channels, driving revenue growth across Amazon, retailer.com and flexfits.com (DTC). You’ll also oversee a small pod of channel specialists across paid social, retail media, and marketplace advertising. You’ll bring structure and clarity to our growth strategy, translating performance insights into smarter investment decisions and scalable acquisition strategies.Flex leadership actively embraces modern AI tools to improve decision-making and operational velocity, and we’re looking for marketers who are equally excited to incorporate these tools into their day-to-day workflows.Flex offers a dynamic, fast-moving environment where ambitious operators can have an outsized impact. If you’re energized by experimentation, performance marketing, and the opportunity to shape the growth strategy of a category-defining brand, this role is an opportunity to help build the future of Flex.This role is remote-flexible; candidates based near our Venice, CA headquarters are a plus.Salary range: $130,000 - $150,000 per year, commensurate with experience and equity stock optionsResponsibilitiesDrive Ecommerce Revenue Growth via Paid Media Strategy & PerformanceOwn total paid digital marketing channel performance acrossDrive growth on Amazon, retailer.com and flexfits.com (DTC) Drive revenue growth while improving blended MER (Marketing Efficiency Ratio) and contribution after marketingReduce CAC while scaling investment responsiblySet quarterly growth roadmaps and testing priorities aligned to revenue targetsAllocate and reallocate budgets across channels based on performance, incrementality, and margin impactDefine and continuously refine Flex’s target blended MER and efficiency benchmarksDigital Marketing Channel Oversight & Performance AccountabilityOversee performance across:Paid Social (Meta, TikTok, Snap)Retail Media (Criteo, Walmart Connect, Roundel, The Trade Desk, etc.)Marketplace MediaPaid Search and Programmatic (as applicable)Encourage rapid testing of creative visuals and hooks, messaging angles, and campaign structures to improve paid media learning velocityLead weekly performance reviews with channel ownersEnsure clear KPI ownership, disciplined optimization, and consistent testing cadenceDrive accountability across internal specialists, agencies, and external partnersReporting & AnalyticsBuild and maintain unified cross-channel digital marketing performance reportingUse AI-assisted analysis to accelerate insight generation and shorten the time between performance data and optimization decisionsDeliver monthly executive-ready summaries including blended ROAS, MER, CAC trends, retail vs ecommerce efficiency, and budget pacingDevelop a clear margin-based performance view rooted in contribution economicsImprove forecasting accuracy and visibility into spend efficiencyEnsure performance insights are clearly documented and translated into actionAI-Enabled Growth ExecutionLeverage modern tools, including AI, to accelerate performance analysis, experimentation, and marketing decision-makingUse AI-assisted workflows to quickly synthesize campaign data, identify performance drivers, and surface optimization opportunitiesIncrease testing velocity across paid media through AI-assisted ideation of hooks, messaging angles, targeting hypotheses, and landing page variationsUse AI to accelerate recurring marketing workflows such as performance reporting, competitive research, and campaign analysisDemonstrate practical applications of AI that improve team efficiency and insight generation, helping elevate how the broader marketing team operatesPrioritize tools and workflows that drive revenue impact rather than introducing unnecessary tooling or infrastructureCross-Functional PartnershipPartner closely with the Director of Ecommerce to align paid growth with merchandising, inventory, and revenue objectivesProactively communicate risks, opportunities, and performance shiftsServe as the connective tissue across channel specialists and revenue stakeholdersRequirements5+ years of experience in ecommerce, growth marketing or performance marketingExperience managing and allocating 7-figure multi-channel paid media budgets with a focus on profitability and incrementalityDemonstrated ability to use AI to accelerate performance analysis, testing velocity, or marketing decision-makingDeep understanding of MER, CAC, ROAS, contribution margin, and performance forecastingExperience overseeing retail media networks such as Criteo, Walmart Co