Controlled digital engineering for financial operations.
We support payment, reconciliation, reporting and risk platforms where traceability, resilience and controlled change are central to delivery.
We design and modernise payment flows, reconciliation engines, regulatory reporting pipelines and risk calculation platforms. Financial values, processing rules and changes require attributable evidence, reproducible runs and controlled approval.
Operational evidence, exception handling and root-cause analysis are built into the delivery approach so that failures can be investigated and changes remain controlled.
Payments & reconciliation platforms
High-volume matching engines with full audit trails and explicit exception handling.
Regulatory reporting pipelines
Deterministic data lineage from source systems to controlled reporting outputs.
Risk & pricing engines
Validated calculation services with versioned models and reproducible runs.
Legacy modernisation
Strangler-pattern migrations off end-of-life cores, with parallel-run evidence before cutover.
How the work may be structured.
These examples show the types of work Stemma can scope and deliver. They are not claims about named client projects.
Reconciliation platform
Multi-source transaction matching with explicit exception handling and a controlled audit trail.
Open-banking integration layer
Token-brokered API gateway between a legacy core and third-party providers.
Model validation harness
Automated regression and benchmark suite for a credit-risk model inventory.
Planning a finance programme or project?
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