Introduction

FLUX — the Flow Language for Universe eXperimentation — is an open, declarative specification for describing synthetic customer universes: the population, commerce surface, behaviours, activations, and simulations of a governed digital twin.

It exists so a business question — "how many at-risk TV customers in a given market would a payment-recovery campaign save?" — can be answered without hand-coding a bespoke data generator, pipeline and dashboard for every question. You declare the world and the scenario; a FLUX toolchain compiles, validates, materialises and streams it.

Why not just build the real thing?

Enterprises rebuilding themselves "from the core to the customer" stall in the same place: the ambition is a real-time, contextual customer experience, but the estate that must feed it is a decade of accreted systems that cannot be safely re-platformed at once. The missing capability is the ability to know, with evidence and before you build, which signals are worth extracting from the core — and to ship them under a contract that survives the estate changing underneath.

FLUX supplies the discovery half of that capability. The delivery half is FLUID, the data-product contract standard. They interlock at exactly one seam:

  1. Discover in the twin. Run candidate rules against a synthetic population. Measure outcomes. Keep the winners.
  2. Prove under contract. The winning rule is exercised against a FLUID contract in the twin — conformance, quality, consent reach and sovereignty checked offline, with no production exposure.
  3. Ship the same contract. Because the contract proven in the twin is a FLUID document, promoting to production is not a re-implementation. The same file is wrapped around the real estate.

The economic consequence: capital is committed to building a data product only after evidence says it matters, and the thing that ships is the thing that was proven.

What a FLUX universe is made of

Nineteen document kinds in six families — population, commerce, behaviour, activation, calibration, composition — each a small YAML document sharing one envelope. See The Six Families and the full kind reference.

Status

FLUX is a v0.3.0 working draft under Apache 2.0. Pre-1.0, minor versions may break; every release ships a schema diff and a regression suite. Start with the Quickstart.