Jonathan Stewart

Jonny is a Lead AI Engineer who helps organisations unlock practical, measurable value from Generative AI. He specialises in building and deploying AI-powered tools that drive efficiency across marketing, content, and customer operations, turning bold ideas into real-world impact from day one.

With over two decades of experience spanning digital marketing and AI engineering, Jonny brings a rare combination of technical depth and commercial instinct. His background leading large marketing teams and shaping integrated strategies for major brands gives him an instinctive understanding of what marketing organisations actually need from AI.

His work at Magnus focuses on designing and building production-ready AI solutions, with deep expertise in prompt engineering, model evaluation, and end-to-end deployment that delivers clear, quantifiable outcomes for clients. Jonny is a core architect of the Magnitude platform.