Dex

Dex is a London-based AI talent-matching company founded in early 2025, built on the premise that hiring machine-learning engineers requires different signals than traditional technical recruitment. Where generalist platforms optimise for volume, Dex uses AI-driven matching to place ML engineers with companies that need production-grade model work: clients include Granola (AI meeting notes), Synthesia (AI video generation) and ElevenLabs (AI voice synthesis), a portfolio of well-funded London AI companies that collectively validate the platform's niche. By April 2026, Dex had reached $1.8 million in annualised recurring revenue, which is unusual traction for a pre-Series-A marketplace business operating for roughly twelve months.

On 28 April 2026, Dex closed a $5.3 million seed round led by Notion Capital, with a16z Speedrun, Concept Ventures, and angels from OpenAI also participating . The presence of OpenAI angels alongside a16z Speedrun, which is Andreessen Horowitz's dedicated London seed programme, positions Dex within the London AI operator ecosystem at an unusually senior level for a seed-stage company. The round is small by the standards of the contemporaneous Ineffable Intelligence $1.1bn raise in the same week, but the $1.8m ARR at seed is a materially different signal: revenue at seed in a marketplace business is rarer than research credibility.

Dex's significance as an entity is partly structural: the demand it serves, ML engineers for hire, is itself a proxy measure for the pace of applied AI hiring in London. If the client list extends beyond Granola, Synthesia and ElevenLabs into pre-revenue or pre-product AI labs, that would signal an acceleration of team formation in the sector. Conversely, concentration in a small set of well-funded London AI clients creates platform risk if those clients build internal recruiting capability as they scale.