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Full Stack Engineer (Kotlin / GCP), Payments Connectivity
COGNIZANT TECH SOLUTIONS A
Source: Headcount Labs · original listing ↗
Job data: Headcount Labs, ODbL 1.0. Job descriptions belong to their employers.
Posted 6 days ago
About this role
About the Role You will join a team that builds and runs payment connectivity services integrating a large-scale online payments platform with external payment service providers. You will own features end to end across backend services, serverless components, cloud infrastructure, and CI/CD, and contribute to the customer-facing payment flows. What You’ll Do Design, build, and maintain backend services that integrate with payment service providers for payment initiation and status retrieval. Develop and support webhook and callback handlers that process asynchronous payment events reliably and securely. Implement secure data exchange, including payload encryption and decryption and managed secrets. Define and maintain well-documented APIs that follow internal standards and are validated through automated checks. Secure inbound and outbound traffic using API gateway, edge, and cloud security controls. Manage cloud infrastructure as code and deploy services on a serverless, container-based platform. Build and improve CI/CD pipelines covering testing, validation, release automation, and deployment. Support production through monitoring, incident triage, root-cause analysis, and payment status reconciliation. Contribute to platform and edge improvements and to technical documentation. Collaborate with platform teams and external provider contacts. Required Skills Strong backend experience in Kotlin (or Java with a readiness to work in Kotlin) and a modern framework such as Micronaut or Spring Boot. Hands-on experience with Google Cloud Platform (serverless compute, messaging, load balancing, security, secret management). Experience designing and consuming REST APIs and OpenAPI specifications, and working with API gateways. Solid understanding of webhook and callback patterns , idempotency, retries, and failure handling. Working knowledge of encryption and secure data exchange . Infrastructure as Code with Terraform. CI/CD with GitHub Actions or an equivalent tool. Strong testing discipline (unit, integration, contract) and observability practices. Nice to Have Experience in payments or fintech , including PSP integrations, reconciliation, and PCI-DSS awareness. Knowledge of CDN and edge security (WAF, routing, security rules). Frontend skills (TypeScript, React or similar) for payment, redirect, or status-handling flows and internal tooling. Familiarity with regional payment methods and regulatory guidelines. Experience with event-driven architectures and microservices. Experience with monitoring tools such as Dynatrace, Splunk, Prometheus, or Grafana.