Growth Marketing Lead (User Acquisition & AI Experimentation)

Location : Fully Remote

Type : Full-Time

Flex AI is a cutting-edge fitness platform built for weightlifters, helping nearly 1 million users optimize their gym training. Our mission is to make fitness smarter, more accessible, and fun , empowering people to stay consistent and get stronger, faster.

App : Flex AI on App Store

Website : www.flexfitnessapp.com

Patent : https : / / patents.google.com / patent / WO2020252599A1 / en

What You’ll Do

We’re looking for a Growth Marketing Lead to help us find and scale profitable acquisition channels. This role is for a data-driven, experimental marketer who thrives on testing, iterating, and optimizing to drive down CAC while increasing LTV.

You’ll own user acquisition, paid media, and growth experiments , working closely with our Growth Product Manager to turn insights into high-performing campaigns.

Find & validate scalable acquisition channels (paid ads, SEO, influencers, referrals, etc.)

Optimize CAC & LTV through A / B testing, creative iteration, and audience segmentation

Run paid campaigns across Meta, TikTok, Google & more —testing & optimizing ads for efficiency

Develop non-paid growth strategies (UGC, content, partnerships, viral loops, etc.)

Leverage AI automation & analytics tools

Experiment with influencer UGC & creative-driven marketing to drive user growth

Collaborate with Growth PM to optimize the full funnel—from acquisition to retention

Who You Are

We want a growth hacker at heart —someone who loves running experiments, crunching data, and scaling what works.

Data-driven – You make decisions based on metrics, not guesswork

Performance-focused – You know how to drive conversions, not just clicks

Fast-paced executor – You move quickly and optimize in real-time

Paid ads pro – You can launch and scale Meta, TikTok, and Google campaigns

AI & automation savvy – You know how to use tools that make marketing smarter

Creative strategist – You understand why certain ads perform and how to iterate

3+ years in growth, performance marketing, or user acquisition

Experience managing $50k+ / mo in ad spend across Meta, TikTok, Google, etc.

Strong understanding of CAC, LTV, and conversion rate optimization (CRO)

Proven ability to scale acquisition channels while lowering costs

Hands-on experience with A / B testing, landing page optimization, and analytics tools

Bonus : Experience with influencer marketing & UGC for ad creatives

What You’ll Gain

Own the growth engine at a fast-growing fitness tech startup

Hands-on experience with AI-driven marketing automation

Be part of the future of fitness & gym culture

Fast learning environment with high autonomy

Competitive salary + performance-based bonuses

Ready to Apply?

If you’re obsessed with growth, love running experiments, and know how to drive down CAC , we want to hear from you.

Send us your resume & a few lines on what you’d test first to lower CAC for Flex.

Let’s grow something big. 🚀