Nexus

Tandem Interactive is a digital marketing agency in Fort Lauderdale, and Nexus is the platform the team works in. Everything from client reporting to content production happens inside it, with AI underneath. I designed it and I write all of the code. I prefer to own a system from end to end, and on a platform this wide it also means nothing falls between two people's definitions of done.

Before Nexus, the agency's work lived where agency work usually lives: in a pile of browser tabs and exports that did not agree with each other. Now the team looks at the same live data. The AI works from each client's real numbers, and when data is missing it says so.

The rules underneath it

Client work runs on these rules.

• Every number carries its uncertainty.

  A single confident number falls apart the moment somebody asks one good question. Nexus reports ranges, and it only calls something a change once those ranges stop overlapping.

• Nothing in the system is allowed to fabricate.

  A missing key or a dead data source produces a disabled feature with a label on it. Nothing is invented to fill the space. A blank cell tells you something, and a plausible wrong number reaches a client before anybody catches it.

• Anything with consequences leaves a trail.

  Actions that touch client data or spend money pass a permission check first and write an audit record afterward. The platform fails closed, so when it cannot verify something, it refuses.

How the AI layer is put together

Model calls route through a layer that falls back when a provider degrades or a context window changes underneath it. Tool access runs through Model Context Protocol servers, so adding a capability does not mean writing new glue code for each integration.

The AI visibility measurement inside it uses the method I published in the writing here. Every prompt is sampled several times per engine, every rate carries a Wilson interval, and a drop alert stays quiet until those intervals separate.

What I can share publicly

Nexus is proprietary to Tandem, so this page stays in prose with no screenshots and no internals. I will say that building it alone meant every part was designed to fit the others, which is most of why it holds together.