Java Developer (W/React)

Integer Consulting; Lisboa; Hybrid; EUR 42,000 - 65,000; Full time

Job summary

Integer Consulting is hiring a Java Developer (w/React) for a hybrid project in Lisbon. You will contribute to backend microservices in Java and drive frontend work with React. The role requires strong RESTful and GraphQL API experience and OpenAPI documentation, plus IAM familiarity with Keycloak and Okta (OIDC/RBAC).

Fluency in English is mandatory; Lisbon-based hybrid setup supports collaborative, cross-functional work. Join a team that values continuous learning and career growth.

Qualifications

• 4+ years of Java development and microservices experience.
• Frontend experience with React is required.
• Experience with RESTful and GraphQL APIs and OpenAPI documentation.
• IAM experience with Keycloak and Okta and proficiency with OIDC/RBAC is preferred.

Responsibilities

• Develop robust Java backend services and microservices architectures.
• Build and integrate React-based frontend components.
• Design and document RESTful and GraphQL APIs with OpenAPI specs.
• Implement IAM flows using Keycloak/Okta with secure RBAC and tokens.

Skills

Java

Microservices

React

RESTful APIs

GraphQL

OpenAPI

OIDC/RBAC

Keycloak

Okta

English fluency

Job description

Integer is expanding its teams with an Java Developer (w/React) to join a hybrid project in Lisbon (3x peer week).

We are looking for someone with:

• +4 years of experience in Java and microservices;
• Experience in React;
• Experience in RESTful and GraphQL APIs with full OpenAPI documentation;
• Experience in Keycloak and Okta IAM flows including OIDC, RBAC and token customization.
• Fluency in English (mandatory);

About Integer

Integer Consulting is a 100% Portuguese technology consulting company, specialized in IT Outsourcing, Nearshore, Software Development, and Custom Software Development. More than simply finding the right project for each professional, we aim to create opportunities for career growth. We invest in continuous training, organize internal events and initiatives throughout the year, and promote a close, collaborative culture focused on knowledge sharing.

Join our team and be part of the next generation of technological projects at Integer.