Fintech & Payment Systems
PCI-DSS-compliant payment flows, idempotent transaction architecture and low-latency risk scoring.
Finance is a sector with zero tolerance for error. A single double charge or a single lost transaction undermines user trust and regulatory compliance. On fintech projects, Linu Technology builds idempotent payment architectures, distributed transaction management, real-time fraud detection and PCI-DSS-compliant card processing flows. With queue-based event ordering, exactly-once semantics and a comprehensive audit log infrastructure, we build enterprise-grade financial software.
The reality of the sector
Typical problems we encounter on every project in this field.
- 1Integrating multiple payment providers (Stripe, iyzico, bank POS systems)
- 2PCI-DSS-compliant card data processing and tokenisation
- 3Idempotent transaction design — preventing double charges
- 4Meeting several regulatory regimes at once: BDDK, KVKK (Türkiye's Personal Data Protection Law) and GDPR
- 5High-volume risk scoring (thousands of transactions per second)
- 6Blacklists, fraud detection and manual review workflows
Practical architecture
A technical approach designed around realities on the ground.
- Event-sourced payment architecture (Kafka + idempotency keys)
- Vault-based secret management (HSM-backed)
- Real-time risk engine (Flink or Kafka Streams)
- Reconciliation services and daily reconciliation reports
- PCI-DSS audit preparation and evidence-collection automation
Technology Stack
Compliance & Standards
- PCI-DSS
- KVKK (Türkiye's data protection law)
- GDPR
- BDDK (Türkiye's banking regulator)
- ISO 27001
Solutions we offer in this sector
Our projects in Fintech & Payment Systems
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