About us · Guildford, Surrey
We are a small studio in Guildford that designs, builds and runs AI-driven systems and processes for businesses across Surrey and the South East. The technology changes monthly. The need for someone accountable on your side does not.
The name
Your opposite number is the person in the other organisation who does what you do: the one you ring when something needs sorting, who understands the pressure you are under and has the authority to act. That is the relationship we want with every client.
AI makes it more important, not less. Businesses are being sold tools that promise to run themselves. In our experience they do not. They need people who understand the models, the data, the security risks and the regulations, and who are reachable when a supplier changes something overnight. We are those people. Real developers, on your side, keeping the systems streamlined, secure and compliant while you run the business.
There is a quieter meaning too. In maths, 1 and −1 are each other's opposite number. Put them together and the noise cancels out. We like that.
Founders
Co-founder
Jonathan has spent two decades building digital products and running agency teams. He leads strategy and delivery at OppositeNumber: finding where AI genuinely pays back in a business and making sure what we build is used, measured and kept honest.
Co-founder
Ewald leads engineering. He designs the systems behind every build, from data pipelines to the guardrails that keep AI compliant and secure, and he is the person on the other end of the line when something needs to change at short notice.
How we behave
A named founder owns every engagement. You will never be handed to a ticket queue or a chatbot when something matters.
If AI is not the answer, or a cheaper tool exists, we say so before you spend. Honesty early saves money later.
Least-privilege access, encryption, no training on your data, and an audit trail on every automated decision. Written into every statement of work.
Working software in weeks, with an agreed number to move and a report against it after launch.
Where we are
2 Guildford Park Road, Guildford, Surrey, GU2 7ND
Most of our clients are within 45 minutes of the studio: Farnham, Godalming, Woking, Haslemere and across Surrey and Hampshire. We would rather start a project in your office than on a video call.
A 30-minute call with a founder. Bring a problem and we will tell you honestly whether AI, software or neither is the answer.