// Case study · FinTech
A secure payment gateway built for scale
An enterprise-grade payment gateway with layered security and a clean integration API.
// 01 · Challenge
What they brought us
Building a secure and scalable payment processing system that businesses could integrate quickly. Payments demand strict correctness, auditability and defense in depth, without making the API painful to adopt.
// 02 · Solution
What we built
Developed an enterprise-grade payment gateway with layered security, fraud controls and a clean integration API, designed so integrators get safe defaults out of the box.
// 03 · Approach
How we worked
Threat modeling first
Started from the attacker's view: mapped the trust boundaries, abuse cases and failure modes before writing the first endpoint.
API design
Designed an idempotent, versioned payment API with safe defaults, clear error semantics and predictable webhooks.
Security controls
Implemented layered controls: encryption in transit and at rest, key isolation, rate limiting, audit logging and fraud checks in the transaction path.
Scale and reliability
Built on PostgreSQL and Redis with careful transaction design, then load-tested the transaction path and tuned the hot spots.
// 04 · Stack
Built with
services: software development · cyber security · devops services · see all services
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