Growth Marketing Manager, Paid Social

Want to help everyday Americans invest and build wealth? Financial inequality is increasing, and too many people are getting left behind. At Stash, we're passionate about democratizing wealth creation through education, advice, and products that help customers achieve greater financial freedom. We also believe in working smarter—leveraging AI and emerging technologies to move faster, operate more efficiently, and focus our time on solving meaningful problems for our customers.We're looking for a Growth Manager, Paid Social to own Stash's paid social and mobile ad network acquisition. You'll be part of our growing Growth team and report to the Sr. Director of Acquisition. You'll own channel strategy, optimization, testing, and measurement across paid social (Meta, Tiktok) and platforms like AppLovin—with real influence over how efficiently we acquire new customers.This is a role with real scope and huge impact: you'll run hands-on media, build a disciplined experimentation system, and use AI-enabled workflows to operate at higher velocity. You'll partner closely with our Performance Creative Strategist to build a highly performant paid social engine. Over time, you may expand into additional performance channels as the business prioritizes them.We're looking for someone who thinks in marginal CAC and test roadmaps, gets energy from reading the account and the funnel, and knows how to turn a test-and-learn process into a repeatable engine for growth.This position operates on a hybrid schedule, requiring you to be on-site in our New York office at least three days per week to work with stakeholders and foster team collaboration.What you'll do: Own paid social and mobile network performanceDevelop and own strategy and execution for paid social (e.g. Meta, TikTok) and mobile ad networks (e.g. AppLovin), with a focus on efficient new customer acquisitionManage budgets, pacing, bidding, audience/structure decisions, and optimization to improve CAC, payback, and scalable growthBuild and manage a testing roadmap that keeps a constant stream of media experiments in marketOptimize the conversion systemOwn acquisition landing page experimentation tied to your channels—prioritize the test backlog, define success metrics, and ship/kill/scale based on performancePartner with the Performance Creative Strategist on message match between ads and landing pages; own the performance readout and decisioningIdentify and implement AI-driven tools and workflows that accelerate reporting, optimization, experiment tracking, and day-to-day media opsAnalyze and iterateAnalyze performance data to identify what's working, what's decaying, and where the next dollar should goTurn learnings into new hypotheses across targeting, bidding, structure, offers, and landing pagesReport on channel and funnel performance and share insights with the broader acquisition and marketing teamsPartner cross-functionallyCollaborate tightly with the Performance Creative Strategist to close the loop between creative, partners, and paid media (including whitelisting/Spark where creators feed paid)Partner with Data, Product, Brand, and Martech on attribution, incrementality, and measurementProvide media input on campaign planning and, over time, expansion into additional performance channelsWhat we're looking for: Your success will be measured by performance metrics like CAC, payback, ROAS, and new customer acquisition—not vanity reach. You understand that great performance media sits at the intersection of capital allocation, experimentation, and systems thinking, and you're energized by the process of testing your way to what works. You can open an account and quickly tell a clear story about what's driving results.4-6 years of hands-on experience buying and optimizing paid social (e.g. Meta and/or TikTok), with a track record tied to performance metricsDeep knowledge of working with MMPs (eg AppsFlyer)Experience building and executing testing roadmaps across media and landing pagesStrong analytical skills—comfortable with performance data, experiment design, and translating insights into actionBias for speed and ownership; experience operating with AI tools or automation to increase leverage is a plusStrong communication skills, with the ability to partner effectively with creative, data, and cross-functional stakeholdersGold StarsExperience with mobile ad networks / UA platforms (e.g. AppLovin) or strong adjacent mobile performance experienceExperience owning landing page / CRO testing for acquisition funnelsFamiliarity with fintech, consumer finance, or another regulated industryExperience with incrementality testing, attribution, or media mix measurementExperience standing up or scaling additional performance channels beyond social/mobileA curiosity and familiarity with AI tools that can help streamline and improve processes