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Kross Finance · Backend Lead · FinTech

Kross Finance: a private-network partner gateway

For a Korean lender giving small businesses same-day funding against card-sales receivables, a proxy service that now carries 6%+ of FY23 transaction volume.

Role
Backend Lead
Context
2022 to 2024
Stack
Proxy service · Private network · SOLID refactoring
Kross Finance partner gateway: partner systems connect through a proxy service inside a private network to core financial services, carrying over 6 percent of FY23 transaction volumeFIG. 05 / KROSS FINANCEPartner gateway on a private networkPartner AexternalPartner BexternalPartner CexternalPRIVATE NETWORKProxy serviceauth · validate · mapCore financial servicestransactions · workflowsPartner processes automated6%+ of FY23 transaction volume+17% service performance
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6%+
of all FY23 transaction volume
+17%
service performance

The problem

Kross Finance needed a safe way for partners to plug into its core financial workflows without exposing internal services, and core service layers that had become hard to change.

What I built

A proxy service deployed on a private network that acts as the partner integration interface, and automates partner business processes end to end.

I also worked with stakeholders on technology roadmaps, and refactored critical service layers using SOLID principles: single-responsibility classes, polymorphism to cut cyclomatic complexity and the command pattern for extensibility.

The result

The gateway now processes more than 6% of all FY23 transaction volume, and the roadmap work improved service performance by 17%, with better maintainability and test coverage.

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