The Zeenko method
Cross-Proof
How we build software that has to hold up in front of a regulator, an auditor, a user and the next engineer.
What it means
Two words, two commitments.
Cross is where the solution comes from. Proof is how we know it holds.
In regulated industries, “it works” is where the questions start. Who approved the data flow? Where is the audit trail? What happens when the rule changes? Cross-Proof is our answer to those questions, and it shapes every project from the first conversation to the handover.
Cross: we bring solutions across sectors, countries and languages, because after fifteen years in fintech, compliance, e-commerce and real estate we have usually seen your problem solved somewhere else. Proof: we build so that every decision can be shown, tested and defended.
Cross
Where the solution comes from.
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01
Rules first
Before features, we document the constraints: applicable regulation, data flows, audit requirements, hosting and liability. They become inputs to the architecture. Compliance that is designed in costs a fraction of compliance that is added later.
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02
One user, one moment
Every system has a moment where the current process fails a real person: the compliance officer running checks by hand, the trader waiting on a manual settlement, the tenant sending a deposit to a stranger. We name that person and that moment. It becomes the definition of done.
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03
Patterns from other sectors
We look for where this problem has already been solved well and adapt the pattern. A regulated onboarding can follow the logic of a checkout. A compliance dashboard can borrow from operations software. A property marketplace can use the data discipline of a trading system. Starting from a working pattern is faster and safer than starting from a blank page.
Proof
How we know it holds.
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04
The hardest part first
The piece with the highest technical or regulatory risk is built as a working proof in the first two weeks, before the rest of the system exists. If it cannot be done, you learn that early and cheaply. If it can, the rest of the project is built on something real.
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05
Verifiable increments
We ship in short, reviewable stages. Decisions, data handling and test results are recorded during the work, not reconstructed afterwards. By launch, the documentation an auditor expects already exists as a byproduct of building.
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06
Handover with evidence
You receive the system and the material that supports it: architecture notes, a map from each regulatory requirement to the code that implements it, test coverage, and full ownership of the repository. You never depend on us to explain your own software.
The four phases
Where it shows up.
Cross-Proof runs inside our four phases. The phases are what you buy; the method is how the work is done.
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01 2 to 4 weeks
Assess
Rules first and one user, one moment. We find the real problem, the regulatory constraints and the architectural debt before anyone writes a proposal.
→ About Assess -
02 4 to 8 weeks
Architect
Patterns from other sectors and the hardest part first. A technical blueprint with compliance built into the structure, and the riskiest piece already proven.
→ About Architect -
03 3 to 12 months
Build
Verifiable increments. Production systems delivered in reviewable stages, with decisions and tests documented as we go.
→ About Build -
04 Ongoing
Evolve
Handover with evidence, kept current. Rules change and markets move; we keep the system and its documentation up to date.
→ About Evolve
Outcomes
What you get from working this way.
- A yes or a no on the riskiest part before you commit to the whole build.
- Documentation that already exists on launch day.
- A system your own team, or any other vendor, can take over.
- Fewer surprises when the regulator or the market changes the rules.
Next step
Start with the hard part.
Tell us the piece of the system you are least sure about. That is where Cross-Proof begins.