Founding Client Partner — AI Performance Marketing | London (hybrid, remote-first) ~£90K-£110K base / ~£185K-£220K OTE

Job Details

Founding Client Partner — AI Performance Marketing | London (hybrid, remote-first) ~£90K–£110K base / ~£185K–£220K OTE

Job Type:

Permanent

Salary:

Negotiable

Location:

London, South East

Description:

A fast-scaling, well-funded AI company is hiring its first commercial hire on the ground in the UK. Backed by over $20M in seed funding from a top-tier Silicon Valley venture firm, our client has built the first fully agentic AI platform that autonomously runs and scales paid media campaigns across Google, Meta and Microsoft — with more channels on the way. This is a rare, build-from-scratch opportunity to own the UK go-to-market motion, working directly with the founder and US sales leadership.

Their AI agents handle the heavy lifting of cross-platform optimisation and measurement — the biggest headaches for performance marketers — and are already driving a meaningful double-digit uplift in sales and return on ad spend for a growing roster of D2C brands and apps. You'll be the founding UK seller in a genuine player-coach role: own the full sales cycle now, and build and lead a UK team as you prove the market.
About the role

We're looking for a Founding Client Partner with 4+ years of full-cycle sales experience in AdTech or Marketing SaaS, sold to performance marketers and agencies. You're comfortable operating without a playbook, energised by taking a brand-new AI product into a vast (job_detailsT+) market, and ready to generate the majority of your own pipeline. You'll shape how the platform is positioned and sold in the UK, and lay the foundation for the team that follows.

What you'll be doing
• Own the full sales cycle from prospecting to close, self-generating 75%+ of your pipeline through strategic outbound — email, LinkedIn, events and your network across the UK performance marketing and agency ecosystem.
• Identify and win mid-market performance marketers — brands and agencies spending six figures a month on paid media — testing and iterating sales motions to find what's repeatable.
• Partner closely with the US sales team to adapt the GTM strategy for the UK and build a scalable playbook that supports future hires.
• Act as a trusted advisor to marketers, showing how AI agents optimise campaigns, budgets and ROAS across Google, Meta and emerging platforms.
• Grow into a player-coach leader — as you prove the market and build demand, hire and manage additional reps.
What we're looking for
• 4–8 years' full-cycle sales in AdTech, ad platforms or Marketing SaaS, selling to performance marketers, VPs of Marketing or agency buyers.
• Zero-to-one GTM experience at an early-stage or high-growth startup (Seed–Series B) — you've sold without an established brand or playbook.
• Strong performance marketing knowledge — you can talk ROAS, attribution and media-mix modelling credibly.
• A track record of self-sourcing pipeline (75%+) and active relationships with UK performance agencies or brands.
• Ideally prior experience at a large ad platform (e.g. Google, Meta, Snap) before moving into a startup environment.
• Collaborative and team-oriented — this is not a quota-only 'boiler room'. Based in London; no visa sponsorship available; willing to travel to the US roughly once a month.

What's on offer
• Competitive base with a 50/50 OTE structure — circa £90K–£110K base, ~£185K–£220K OTE — plus meaningful equity in an early-stage business at the earliest possible stage.
• A founding role with a clear path to build and lead the UK team as the market scales.
• Direct exposure to the founder and US leadership, and the chance to shape an entire GTM function from scratch.
• A collaborative, high-calibre, low-ego culture built by ex-big-tech operators and top engineers.

About the company
Our client is an early-stage, venture-backed AI company on a mission to democratise advanced advertising technology. Founded by operators who previously built AI products inside one of the world's largest advertising platforms and scaled engineering at a leading e-commerce company, they bring advanced data science and machine learning to businesses that were previously priced out of it. A lean, senior, technically exceptional team is scaling fast across the US and UK. (Company name shared on application.)

Keywords
Performance Marketing, AdTech, Ad Technology, Marketing SaaS, MarTech, Paid Media, Paid Social, PPC, Digital Advertising, Programmatic, DSP, Media Buying, ROAS, Attribution, Media Mix Modelling, Google Ads, Meta Ads, Microsoft Ads, Account Executive, Founding AE, Client Partner, Sales Lead, Business Development, New Business, Full-Cycle Sales, Outbound, Pipeline Generation, GTM, Go-to-Market, Agency Sales, Brand Sales, Startup, Scale-up, Seed, Series A, Series B, AI, Agentic AI, Machine Learning, London, UK.