Growth Marketing Manager: Paid Social

Who We Are For too long, the bra industry was stuck in outdated ideas, forcing women to choose between feeling sexy or comfortable. So in 2013, Heidi Zak and Ra’el Cohen created Thirdlove–a third, better option designed to help women look and feel their best. Prioritizing real-world fit over outdated standards, Thirdlove disrupted the industry by inventing half-cup sizes and the Fitting Room® quiz. The result was a more precise fit that offered comfort without sacrificing style. Today, Thirdlove remains an innovative design-led brand, handling everything from R&D to the supply chain in-house to get every detail just right. How We Work Our culture is inclusive, collaborative, fast-paced, and data-driven. We’ve been certified as a Great Place to Work® for four consecutive years, based on feedback from our own team. If you want to make an impact while propelling your career forward, we’d love to hear from you. What We Are Looking For As the Growth Marketing Manager for Paid Social, you will own Meta, TikTok, and support on Pinterest from strategy through execution. You will oversee platform and agency relationships, direct AI tools for optimization, partner with internal teams on creative briefs and testing, and be the person who drives how we grow on these platforms. You understand that winning on Meta requires both a data-driven and creatively-led approach. You treat Paid Social as a strategic function, take performance personally, have strong opinions about creative, and bring a genuine point of view to every channel decision. What You Will Own And How You Will Make A Difference Own paid social strategy across Meta and TikTok Set the channel strategy for Meta, TikTok, and support on Pinterest including account and campaign architecture, funnel coverage, and budget allocation across each platform Own budget pacing across all three channels; make real-time reallocation decisions based on performance signals Lead incrementality test design for social channels in coordination with our measurement stack Contribute channel-level commentary to weekly cross-channel performance reporting Stay ahead of platform product changes, beta opportunities, and algorithm shifts on each platform Manage platform and agency relationships Serve as the primary point of contact for all platform and agency relationships Manage day-to-day communication and performance accountability with any external partners on your channels Evaluate partner and vendor performance against clear outcomes; own the relationship and the decisions that come with it Consolidate institutional knowledge internally so that performance insights and channel history live with the team, not outside it Direct, evaluate, and push back on AI tools Oversee and direct AI execution tools for bid management, audience optimization, pacing, and creative performance with curiosity about what they can do and healthy skepticism about when they are not working Interrogate automated optimization outputs: understand what the tool is doing, why it is making those decisions, and whether the logic actually serves the strategy Push back when AI-recommended actions do not hold up to scrutiny; override confidently and document what you learned Set guardrails, test protocols, and performance benchmarks that hold AI tools accountable to real outcomes, not just internal optimization metrics Lead AI tool evaluation with an analytical eye; you define the test and interpret the results Partner on creative strategy and testing Work closely with key stakeholders on creative brief direction — bring the performance signal and channel hypothesis to inform what gets made and why Bring a channel-native creative perspective to every brief: what works on Meta is not what works on TikTok; you know the difference and can articulate why Surface creative fatigue signals early and feed them into the brief cycle before performance degrades Collaborate on landing page testing by providing performance data and hypotheses on…