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SOLIDSLATE

Industry

Fintech & Payments Software Engineering

In fintech, a rounding error is a headline and a downtime minute is a regulator's letter. We build the systems that move and account for money with the correctness, auditability and uptime the domain demands, and the product polish that wins customers.

  • Double-entry by default
  • Audit trails built in
  • PCI and SOC 2 aware

4M+

Customers on a payments core we rebuilt

99.99%

Uptime through a zero-downtime migration

0

Ledger discrepancies since go-live on that platform

Where we help

What we build

Payments and ledger cores

Double-entry ledgers, reconciliation, and integrations with card networks, banking rails and payment providers.

Onboarding and KYC/KYB

Identity, verification and risk flows that pass compliance without making legitimate customers give up.

Customer and back-office apps

The dashboards your customers use and the tools your operations and risk teams live in all day.

Reporting and compliance data

The pipelines and controls that make regulatory reporting a query, not a fire drill.

What is different here

How we work in a regulated domain

Correctness first

Money math is modelled explicitly, tested exhaustively, and never done in floating point.

Everything is auditable

Immutable event logs, change history and access records, so any number can be explained after the fact.

Zero-downtime migrations

Schema and data changes shipped without a maintenance window, because there is never a good time.

Security as a control, not a checkbox

Least privilege, secrets management, and a design that a SOC 2 or PCI assessor can follow.

FAQ

Fintech & Payments FAQ

Do you understand our regulatory environment?

We have built for card issuing, e-money, lending and payments across several jurisdictions. We are not your compliance advisers, but we build systems that make your compliance team's job possible rather than painful.

Can you integrate with our existing banking and card partners?

Yes. Card networks, BaaS providers, open banking, and legacy core banking systems. Integration reliability is usually the hardest part, and it is where we spend the most care.

How do you handle a migration off our current core?

Incrementally, behind an abstraction, with the old and new systems reconciled continuously until we cut over. No big bang, no downtime.

Building something in fintech?

Tell us what you're working on. We come back within two business days with a point of view and next steps.