Java Developer

We are looking for a Senior Java / React Engineer to join a Unified Commerce team, contributing to the design and delivery of modern, scalable, and secure digital solutions.

This role combines hands-on development, architectural decision-making, technical leadership, and Identity & Access Management (IAM) expertise. You will work closely with product owners, architects, and engineering teams to shape the technical direction of strategic products.

Key Responsibilities

• Design and implement complex Java microservices.

• Define and promote architectural standards, coding best practices, and security guidelines.

• Lead IAM initiatives, including:

  • Keycloak configuration and realm design

  • Okta federation

  • OAuth2 / OIDC authentication flows

• Drive technical discussions with stakeholders and represent the engineering team.

• Identify and resolve scalability, performance, and security challenges.

• Lead code reviews and software quality initiatives.

• Promote the adoption of tools such as SonarQube and Snyk.

• Mentor and support junior and mid-level engineers.

• Produce technical documentation, ADRs, and operational runbooks.

Requirements

Must Have

• Strong experience with Java and React.

• Experience building and maintaining Microservices Architectures.

• Solid understanding of IAM, OAuth2, OIDC, Keycloak, and Okta.

• Experience with software architecture and design patterns.

• Strong communication skills in both English and Portuguese (C1 level).

• Must be currently residing in Portugal.

The required English and Portuguese proficiency level is C1.

The location is Lisbon, with 3 days in the office. Candidates must reside in Portugal.