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# Java Back End engineer

- **Company:** Employment Business Octopus Computer Associates
- **Location:** Spain (Remote available)
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), Amazon Web Services, Microsoft Azure, Databases, Continuous Integration, Data Deduplication, Distributed Systems, Multi-Factor Authentication, PostgreSQL, OAuth, Octopus Deploy, Public Key Infrastructure, Redis, Openid Connect, Prometheus, Zero Trust Network Access, JSON Web Token, Security Assertion Markup Language (SAML), Session Management, Datadog, Cloud Platform System, Okta, Grafana, Caching, Event Driven Architecture, Customer Identity Access Management, Kubernetes, Apache Kafka, User Identification, Docker, Microservices
- **Published:** September 19, 2026
- **Apply:** https://www.careerboard.com/es/en/find-jobs-in-Spain/-8D49D4AC219557DA14/

## About the Role

* Experience with CIAM at scale: customer identity, identity resolution, or account deduplication.
 * WebAuthn/FIDO2/passkeys, Zero Trust architectures, or PKI.
 * Event-driven architectures (eg, Kafka).
 * Observability tooling such as Prometheus, Grafana, and OpenTelemetry.
 * Deep understanding of OAuth 2.0, OpenID Connect, JWT, and SAML, and when to use each.
 * Proven experience designing and operating distributed systems and microservices in production.
 * Solid database skills (eg, PostgreSQL) and familiarity with caching relevant to Keycloak deployments (eg, Infinispan/Redis).
 * Experience with Docker, Kubernetes, CI/CD pipelines, and at least one major cloud platform (AWS, or Azure).

Remote is allowed as long as the consultant is within EU.

Please send CV for full details and immediate interviews. We are a preferred supplier to the client.

## Description

Senior Java Back End engineer with hands-on experience designing, building, and operating authentication and authorization services.

 * Designed, built, and operated IAM capabilities on Keycloak and Java microservices. Extended Keycloak through custom SPIs, providers, user federation, and themes to meet business requirements
 * Implemented and maintained authentication and authorization flows using OAuth 2.0, OpenID Connect, SAML, MFA, and social or enterprise federation
 * Driven security best practices, including secure token handling, session management, threat modeling, and supporting audits and compliance.


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