Senior Java Backend Architect – Hybrid Lisbon

IRIUM; Lisboa; Hybrid; EUR 31,000 - 35,000; Full time

Benefits offered by this job

Health insurance

Hybrid work model

Professional development

Job summary

IRIUM in Lisbon is seeking a Senior Java Backend Developer to join a challenging international technology project. You will design, implement and optimize scalable microservices, collaborate with product owners and international stakeholders, and lead technical decisions.

The role requires 8+ years in Java backend, strong API experience (REST/GraphQL), IAM, cloud and DevOps know-how, and good command of Portuguese & English (C1). Hybrid work in Lisbon Amoreiras with 3 days on-site and 2 remote.

Qualifications

• At least 8 years of professional Java backend experience.
• Experience designing scalable Java microservices.
• Proven leadership, architecture decisions and best practices.
• Experience developing RESTful and GraphQL APIs with OpenAPI docs.
• Knowledge of IAM (Keycloak/OIDC) and RBAC.
• Experience with event-driven architectures and AWS SQS.
• Strong SQL and relational DB knowledge.
• Identify and fix performance, scalability and security issues.
• Set coding standards, code reviews and quality gates.
• Familiarity with SonarQube and Snyk.
• Agile and DevOps practices.
• Knowledge of React integration with web apps.
• Mentor junior/mid developers.
• Strong problem solving, communication and stakeholder mgmt.
• Portuguese and English at C1; residence in Portugal.

Responsibilities

• Develop and maintain backend Java solutions.
• Design and implement scalable microservices.
• Lead technical decisions and code reviews.
• Collaborate with product and international stakeholders.
• Mentor junior developers and maintain coding standards.
• Ensure security and performance requirements are met.

Skills

Java backend

Microservices

Technical leadership

REST & GraphQL

IAM (Keycloak/OIDC)

AWS SQS

SQL / Databases

Performance tuning

Code reviews / quality gates

CI/CD / DevOps

React integration

Mentoring

Problem solving

Portuguese & English C1

Portugal resident

Tools

OpenAPI

SonarQube

Snyk

CI/CD tools

Job description

IRIUM in Lisbon is seeking a Senior Java Backend Developer to join a challenging international technology project. You will design, implement and optimize scalable microservices, collaborate with product owners and international stakeholders, and lead technical decisions.

The role requires 8+ years in Java backend, strong API experience (REST/GraphQL), IAM, cloud and DevOps know-how, and good command of Portuguese & English (C1). Hybrid work in Lisbon Amoreiras with 3 days on-site and 2 remote.