Building products that help people think, work, and play.
Hi, I'm Jack, a product engineer and designer who designs and builds human-first products that treat the human side as seriously as the technical side. Interfaces that feel conversational and forgiving, systems that explain their reasoning, and technology that fits into how people actually work rather than forcing them to adapt.

Mass
Human insight, reimagined through synthetic minds. A platform that allows you to create synthetic human personas that can think, reason, and respond like real people.

Emmly
Make space for what you imagine. Creative partner that unlocks new ways of thinking, feeling, and making. Emmly empower creators to explore, experiment, and create without limits.


Beryl
E-commerce website for Beryl, a London-based bike light and transport company. Today, they support over 300,000 people using their bikes, e-bikes, e-scooters and cargo bikes to get to work university, and to explore.

Appo
Appo was a startup that built a chatbot for businesses to help them automate customer support and sales for dental practices using AI and chatbots.

Products built at startup speed, without the agency friction.
Built for products
I work with product, data, and engineering teams to ship production systems - conversational interfaces, copilots, multi-agent workflows - that teams actually rely on. Working alongside a network of senior consultants and product designers when needed.
Systems > Services
No hand-offs. No queues. Just proven product engineering refined across decades of shipping complex systems for global brands.
Deliver exactly what you need
From RAG integrations to agentic workflows, everything is built with monitoring, guardrails, and proper error handling. Production systems, not prototypes.
For over 20 years, I've worked with teams at Google, IBM, Air New Zealand, Kpler, EE, News UK, Tesco, and The Economist, sitting in the space between product strategy and hands-on engineering, designing systems and shipping interfaces that make complex decisions feel simple.
Analysing Christmas Adverts 2025
Mass Vision is a persona-based video sentiment tool: a synthetic screening room for ads. You upload a film, synthetic personas watch it, and narrate reactions moment by moment, explaining why, tied to identity, lived experience, ethics, and context. The output is a tension map (not a safe average): where the same scene splits audiences, who feels seen, and who feels repelled. The Christmas ads analysis shows why this matters: social sentiment gave broad takes after launch; Mass Vision shows the segment mechanics underneath, at specific moments. Run it in minutes, iterate while changes are still cheap, and stop learning the hard way in public.
analysing-christmas-advertsMass
My mum thinks it's cool. My friends think it's as odd as a cat with wings. Getting human opinion is hard. It's time-consuming, expensive, and we're not sure we can trust the result. That's why we built Mass, a platform to deploy hundreds of synthetic human personas that think, reason, and respond like the target audience. They're brutally honest and unfiltered, giving a real sense of what audiences wants in minutes, not months. And at a fraction of the cost. Understand perspectives, validate messaging, explore positioning, and more before committing to the real human research.
www.holdmass.comIf you're building products and need help with the human side of the engineering, get in touch at hello@thingsthat.com or
Book a 30-minute call