Clarity for complex
financial operations
We take ownership of complex financial logic and make it work. Billing, reconciliation, pricing engines, contract workflows, and the integrations that connect them.
What we do
Making the implicit explicit
Many operational systems are financial systems in disguise. Billing logic, payment matching, pricing rules, interest calculations, contract workflows — the complexity hides inside processes that don't always look financial on the surface. Business rules end up scattered across legacy code, spreadsheets, and knowledge that lives in people's heads.
We get embedded in your organisation, take ownership of a well-defined scope, and make it work — properly. We surface the complexity, model it precisely, and build systems that are correct, traceable, and maintainable. Not a platform you adapt to, but software shaped around how your business actually operates.
How we work
Depth over volume
Every engagement is led personally and supported by a dedicated engineering team. We take on few projects and go deep — every one starts with understanding, not solutioning.
Event Modeling
We model the information system around your domain using events, commands, and queries — creating a shared blueprint that business, compliance, and engineering can all read.
Spike-driven delivery
We start with the sharpest, most critical slice of your problem. A working vertical through the full stack — from business rule to data store — that proves the approach before scaling.
Rapid prototyping
AI-assisted exploration and fast iteration let us test assumptions in days, not months. We build enough to learn, then refine with confidence.
Built-in traceability
Event sourcing gives you a complete audit trail by design. Every state change is traceable, every decision is explainable — which matters when compliance comes knocking.
Why this matters
Complexity you can't afford to get wrong
Complex financial logic breaks in ways that are hard to predict. Business rules turn out to depend on conditions nobody documented. Integrations behave differently in production. Workflows have exceptions that only surface with real data.
That's why we model before we build, stay close to the domain, and make sure every decision is traceable. When something unexpected surfaces, you need to understand exactly what happened and move quickly.
Deliberate constraints
What we don't do
High-volume, short-term projects
We take on few engagements and go deep. If you need a team for three months and then move on, we're not the right fit.
Hype-driven technology choices
We don't sell "AI-first" or chase the latest framework. We choose technology that fits the problem — and we stay long enough to know if it actually worked.
Engagements where quality must be compromised
If timeline or budget means cutting corners on traceability, testing, or domain understanding, we'd rather not take the project. The systems we build handle real money and real agreements.
Experience
Built from real work
Fabillio is founded on 20+ years of building operational systems — loan management, billing platforms, pricing engines, payment matching, debt collection automation, booking systems, digital contract workflows, and the ERP integrations that connect them to the rest of the business.
Our longest engagements have been as an embedded technical partner — fractional CTO, core team member, the person who's there from the start and owns the outcome. We've built event-driven collection workflows, interest calculation engines, document generation pipelines, and end-to-end financial reporting systems from the ground up.
What clients are buying is direct access to that experience, backed by a dedicated engineering team in Europe that turns clarity into working software. No platform to fit into. No framework to sell. Just the system you actually need.
“What stood out was the combination of domain understanding and engineering discipline. They didn't just build what we asked for — they helped us figure out what we actually needed.”
Let's talk about your situation
If you have a complex operational domain that needs to be understood and built properly, let's talk directly.