Financial systems, engineered like infrastructure.
Banks and fintechs run mission-critical plants. They just call them platforms. Stemma applies industrial engineering discipline to financial systems: deterministic data paths, auditable pipelines, and failure modes designed on paper before they happen in production.
We build and modernise the machinery of finance: payment flows, reconciliation engines, regulatory reporting pipelines and risk calculation platforms. Everything is versioned, validated and traceable, because in finance, 'who changed this number and when' is a contractual question.
Our teams treat a reconciliation break the way plant engineers treat an unplanned stop: instrument it, find the root cause, and engineer it out of the system.
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 submission. No spreadsheet archaeology.
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.
The shape of the work.
Reconciliation platform build
Multi-source transaction matching for a mid-size bank, replacing a manual month-end process.
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.
Have a finance scope in hand?
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