Java Backend Engineer — Microservices, IAM, AWS (Lisbon)

Komodo Consulting; Lisboa; Hybrid; EUR 55,000 - 75,000; Full time

Job summary

Komodo Consulting in Lisbon, Portugal, seeks a Java Backend Developer to design scalable microservices for Checkout, MyAccount, and ODR Processing.

You will own full feature lifecycle, integrate Keycloak/Okta IAM flows, build RESTful and GraphQL APIs with OpenAPI docs, and use AWS SQS/Solace for event-driven patterns while upholding code quality with SonarQube/Snyk and mentoring teammates.

Qualifications

• 4+ years of experience as a Java Backend Developer.
• Strong proficiency in Java and React.
• Experience with microservices, RESTful and GraphQL APIs.
• Hands-on with Keycloak and/or Okta IAM flows (OIDC, RBAC).
• Experience with AWS SQS and Solace messaging.
• Familiarity with SonarQube and Snyk.
• C1 level English and Portuguese.
• Must be based in Portugal.

Responsibilities

• Design and implement scalable Java microservices for Checkout, MyAccount, and ODR Processing features.
• Own the full feature lifecycle: architecture, implementation, testing, code review, and deployment.
• Integrate IAM flows using Keycloak and/or Okta (OIDC, RBAC).
• Build and maintain RESTful and GraphQL APIs with OpenAPI documentation.
• Implement event-driven patterns using AWS SQS and Solace messaging.
• Enforce quality standards with SonarQube, Snyk, and code reviews.
• Mentor junior engineers and contribute to knowledge transfer within the squad.
• Participate in architectural decisions and standards.

Skills

Java

React

Microservices

REST/GraphQL

IAM (Keycloak/Okta)

AWS SQS

Solace messaging

Code quality tools

English

Portuguese

Based in Portugal

Tools

Keycloak

Okta

SonarQube

Snyk

Job description

Komodo Consulting in Lisbon, Portugal, seeks a Java Backend Developer to design scalable microservices for Checkout, MyAccount, and ODR Processing.

You will own full feature lifecycle, integrate Keycloak/Okta IAM flows, build RESTful and GraphQL APIs with OpenAPI docs, and use AWS SQS/Solace for event-driven patterns while upholding code quality with SonarQube/Snyk and mentoring teammates.