Payments Backend Engineer (Kotlin, Cloud)

Cognizant; Comunidad de Madrid; On-site; EUR 70,000 - 110,000; Full time

Job summary

Cognizant Technology Solutions Corporation is seeking a backend developer to own features end-to-end in a payments-focused platform. You will design and implement RESTful APIs, webhook handlers, and secure data exchanges in a Google Cloud environment.

You will work with serverless and container-based infrastructure, define APIs, and manage CI/CD pipelines with GitHub Actions. Collaboration with platform teams and external providers is essential.

Qualifications

• Proficient backend developer with Kotlin (or Java ready for Kotlin).
• Experience with Google Cloud Platform (serverless, messaging, load balancing, security, secret management).
• Design and consume REST APIs and OpenAPI specs; work with API gateways.
• Solid understanding of webhook patterns, idempotency, retries and failure handling.
• Knowledge of encryption and secure data exchange practices.
• Experience with Infrastructure as Code using Terraform.
• Strong CI/CD discipline with GitHub Actions or equivalent.
• Good testing practices across unit, integration and contract tests; observability.

Responsibilities

• Design, build, and maintain backend services integrating with payment providers.
• Develop webhook and callback handlers for asynchronous events.
• Implement secure data exchange with encryption and secrets management.
• Define APIs following internal standards and automate checks.
• Ensure secure inbound/outbound traffic via API gateways and cloud controls.
• Manage cloud infrastructure as code and deploy serverless/container-based services.
• Build and improve CI/CD pipelines including testing and release automation.
• Support production with monitoring, incident triage, and root-cause analysis.
• Contribute to platform improvements and technical documentation.
• Collaborate with platform teams and external provider contacts.

Skills

Kotlin

Micronaut

Spring Boot

Google Cloud Platform

REST APIs

OpenAPI

Webhook patterns

Encryption and secure data exchange

CI/CD

Testing and observability

Infrastructure as Code

Tools

Terraform

GitHub Actions

API gateways

Job description

Cognizant Technology Solutions Corporation is seeking a backend developer to own features end-to-end in a payments-focused platform. You will design and implement RESTful APIs, webhook handlers, and secure data exchanges in a Google Cloud environment.

You will work with serverless and container-based infrastructure, define APIs, and manage CI/CD pipelines with GitHub Actions. Collaboration with platform teams and external providers is essential.