Senior Java Backend Developer

IRIUM Portugal; Lisboa; Híbrido; EUR 31.000 - 35.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Flexible compensation

Health insurance

Professional development opportunities

Descripción de la vacante

IRIUM is seeking a Senior Java Backend Developer to join a challenging international technology project based in Lisbon. You will design, develop and maintain scalable Java microservices and REST/GraphQL APIs while collaborating with product and development teams.

The role requires 8+ years of Java backend experience, hands-on leadership, and strong knowledge of IAM, AWS SQS, SQL and DevOps practices. Hybrid work in Lisbon with 3 days on-site and 2 days remote; gross monthly salary €2,800–€3,100.

Formación

• 8+ years of professional Java backend experience.
• Design and implement scalable Java microservices.
• Technical leadership and architecture decisions.
• RESTful and GraphQL APIs with OpenAPI docs.
• IAM knowledge: Keycloak, Okta, OIDC and RBAC.
• Event-driven architectures with AWS SQS and Solace.
• Strong SQL knowledge and relational DBs.
• Identify bottlenecks, scalability, and security issues.
• Code quality gates, reviews, SonarQube and Snyk.
• Agile and DevOps practices.
• Knowledge of React and frontend integration.
• Mentor juniors; strong communication and stakeholder mgmt.
• Portuguese and English at C1; resident in Portugal.

Conocimientos

Java Backend

Java Microservices

Technical Leadership

REST APIs

GraphQL APIs

OpenAPI Documentation

IAM (Keycloak/OIDC)

RBAC

AWS SQS

Solace

SQL & Relational DBs

Performance & Scalability

Security

Code Quality Gates

SonarQube & Snyk

Agile & DevOps

React & Web Integration

Mentoring

Communication & Stakeholder Mgmt

Portuguese & English C1

Portugal Residence

Herramientas

Keycloak

Okta

OpenAPI

SonarQube

Snyk

React

Descripción del empleo

At IRIUM, we want you to always pursue your dreams! Here, get ready to achieve your goals while enjoying the journey.

We are currently looking for a Senior Java Backend Developer to join a challenging international technology project based in Lisbon.

Required Competencies

• Minimum of 8 years of professional experience in Java Backend development;

• Strong experience in designing, developing and implementing scalable Java microservices;

• Proven experience in technical leadership, architecture decisions and software development best practices;

• Experience developing and maintaining RESTful and GraphQL APIs, including OpenAPI documentation;

• Strong knowledge of Keycloak, Okta, OIDC and RBAC, including IAM architecture, authentication and authorization;

• Experience with event-driven architectures and messaging technologies, particularly AWS SQS and Solace;

• Solid knowledge of SQL and relational databases;

• Experience identifying and resolving performance bottlenecks, scalability challenges and security vulnerabilities;

• Experience establishing coding standards, conducting code reviews and implementing quality gates;

• Familiarity with SonarQube and Snyk;

• Experience with Agile methodologies and DevOps practices;

• Knowledge of React and integration with web applications;

• Experience mentoring junior and mid-level developers;

• Strong problem-solving, communication and stakeholder management skills;

• Portuguese and English at C1 level — mandatory;

• Current residence in Portugal — mandatory.

Preferred Competencies

• Experience in e-commerce, digital commerce platforms or complex enterprise environments;

• Knowledge of AWS Cloud architectures;

• Experience defining software architecture standards and application security strategies;

• Experience producing technical documentation, Architecture Decision Records (ADRs) and runbooks;

• Experience collaborating with Product Owners, solution architects and international stakeholders;

• Knowledge of CI/CD pipelines, automated testing and continuous delivery practices.

Working Conditions

Position: Senior Java Backend Developer

Location: Lisbon — Amoreiras area.

Working Model: Hybrid — 3 days on-site and 2 days remote per week.

Gross Monthly Salary: €2,800 – €3,100, depending on professional experience and technical expertise.

The compensation package may include applicable allowances and additional benefits.

What We Offer

• Integration into an innovative and growing company;

• Participation in challenging international technology projects;

• Opportunities for professional development and career progression;

• Competitive remuneration according to experience and performance;

• Flexible compensation and health insurance as a social benefit;

• Unlimited access to self-paced technology training;

• A collaborative and dynamic working environment focused on innovation and continuous improvement.

IRIUM is a company made up of dynamic and proactive professionals. Our values are responsibility and commitment to the quality of our work. This is the spirit we seek at IRIUM, regardless of your age.

If you identify with these values, this is the company for you!

Let's build the future together. Shall we talk?

At IRIUM, we believe in a world without stereotypes or limitations. We are committed to equal opportunities and fair treatment for everyone, in accordance with our Equality Plan and Code of Ethics, regardless of personal, physical or social circumstances.