Senior Java Application Architect

14 hours ago

Johannesburg, South Africa CloudSmiths Full time

We are looking for a hands‑on Senior Java Application Architect to lead the planning architecture design and development of a payment gateway. This is a high‑impact role where you will build a solution on Google Cloud (GCP) designated for rollout across Africa and international markets You will own the end‑to‑end architecture with a strong emphasis on security compliance (PCI POPIA / GDPR) and operational observability. This is not just a diagramming role; you will lead the Java implementation while ensuring the platform delivers low‑latency high‑throughput transaction processing. Key Outcomes You Will Drive Architect a PCI‑aligned low‑latency payment gateway on GCP with clear SLIs / SLOs Deliver production integrations with external providers including mobile‑money services (e.g. Tigo Pesa, M‑Pesa, Airtel Money) and MNO / banking APIs. Design scalable microservices ready for multi‑region expansion (ZA / EU / UK) with robust reconciliation idempotency and retries Embed PCI DSS controls tokenization and key management while preparing for PSD2 / UK requirement The Tech Stack Java 17 Spring Boot / Spring Cloud JPA / Hibernate (Reactive / WebFlux is a plus) OAuth2 / OIDC mTLS HMAC API policy enforcement Cloud Run (Primary Runtime) and / or GKE Autopilot Cloud SQL (MySQL / Postgres) AlloyDB Memorystore (Redis) BigQuery Pub/Sub Dataflow CI / CD (Cloud Build / GitHub Actions) Terraform (IaC) Who We Are Looking For 8–10 years in Java engineering with 3–5 years as an Application / Domain Architect in payments or fintech. You have built or significantly evolved a payment gateway acquiring platform or wallet / PSP system. Experience with wallet / mobile money flows (e.g. M‑Pesa, Tigo Pesa) regarding KYC float and settlement is strongly preferred. Proven production experience on GCP. Deep understanding of high‑availability traffic shaping, circuit breakers, saga / outbox patterns and event‑driven systems. Required Experience: Senior IC Key Skills Junit General Ledger Accounting End User Support JQuery Blackberry Employment Type: Contract Vacancy: 1 #J-18808-Ljbffr

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