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Full Stack Engineer (Kotlin / GCP), Payments Connectivity

Hybrid in Madrid·Full-time·Added 2 days ago (last checked 6 Nov)

Cognizant

26 open roles

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Our summary

Work mode: Hybrid, Madrid
Contract: Full-time
English: Required

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Skills

Requirements

What we're looking for

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.

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.

About Cognizant

Cognizant is a global IT services and consulting company whose engineers, consultants, researchers and innovators turn ideas into AI and advanced technologies for client organizations. It serves a wide range of industries including automotive, banking, consumer goods, communications and media, healthcare, insurance, retail, manufacturing, and travel and hospitality.

Its work spans areas such as data and AI, digital engineering, business processes, and consulting, helping leading organizations convert ideas into action. The company describes a supportive culture focused on continuous learning and career growth.

Industry: IT Services
In Spain: Madrid, Barcelona, Valladolid

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