Senior Fullstack Developer – Java / React

IRIUM; Lisboa; Hybrid; EUR 21,000 - 24,000; Full time

Benefits offered by this job

Medical insurance

Flexible remuneration

Technology training

Job summary

IRIUM is seeking a Senior Fullstack Developer with Java/React expertise to join our hybrid Lisbon team. You will contribute to backend development with Java/Spring Boot, design REST APIs, and build robust frontend features with React and Next.js.

The role emphasizes architecture discussions, testing (TDD/BDD), and cloud/DevOps practices. The successful candidate has 5+ years of experience, strong SQL knowledge, and a collaborative mindset to work across technologies in a self-managed,

Qualifications

• 5+ years of professional software development experience (senior level).
• Strong back-end development with Java and Spring Boot.

Skills

Java

Spring Boot

REST APIs

SQL

Git

Unit tests

Integration tests

CI/CD

GitHub Actions

Maven

React

Next.js

TDD/BDD

Architecture discussions

Hibernate/JPA

Microservices

Hexagonal Architecture

Event-Driven Architecture

AWS

Pair programming

Tools

Confluence

IcePanel

GitHub

Maven

Hibernate

Job description

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 Fullstack Developer – Java / React

Required Competencies:

• Minimum 5 years of professional software development experience, ideally in a Senior Fullstack role.
• Strong back-end development experience with Java and Spring Boot.
• Experience designing and implementing REST APIs.
• Strong knowledge of SQL and relational databases, such as MS SQL Server or equivalent RDBMS.
• Experience with Git for version control.
• Strong experience writing unit and integration tests.
• Experience with troubleshooting, bug fixing and code optimisation.
• Experience producing and maintaining technical documentation, preferably using Confluence and/or IcePanel.
• Knowledge of DevOps practices, including CI/CD, GitHub workflows and GitHub Actions.
• Experience with Maven or equivalent package management/build tools.
• Front-end development experience with React and Next.js.
• Familiarity with software testing methodologies such as TDD and BDD.
• Ability to participate in architecture discussions, technical decision-making and code reviews.
• Experience with Hibernate, JPA or equivalent ORM technologies.
• Knowledge of application architectures such as Microservices, Hexagonal Architecture and Event-Driven Architecture.
• Experience with AWS or other Cloud platforms.
• Experience with pair programming.
• Comfortable acting as a technical reference and supporting other members of the development team.
• Generalizing-specialist mindset, with the flexibility and curiosity to work across different technologies and responsibilities.
• Independent and entrepreneurial mindset.
• Strong sense of ownership and accountability.
• Open to giving and receiving constructive feedback.
• Collaborative and comfortable working in self-managed and flat organisational structures.
• Curious, adaptable and motivated to continuously learn.
• Strong team spirit, emotional maturity and positive attitude.
• Detail-oriented and committed to software quality.

Seniority:

Senior profile – between 5 and 8 years of professional experience.

The ideal candidate is able to work under broad direction, act as a technical role model, facilitate technical and architectural decisions, and positively influence teams beyond their immediate scope.

Working Model:

Hybrid – Lisbon

2 non-consecutive days per week at the office
3 days per week working remotely

Working Schedule:

The position follows two different annual schedules and includes 12 additional Compensation Days, on top of the regular annual leave entitlement.

Winter Schedule – October to May | 43 hours/week

Monday to Thursday: 09:00–19:00
Friday: 09:00–17:00

Summer Schedule – June to September | 39 hours/week

Monday to Thursday: 09:00–18:00
Friday: 09:00–17:00

The additional Compensation Days are fixed during national holiday periods:

• 5 days between Christmas and New Year
• 5 days during Easter
• 2 days during Carnival

Gross Monthly Salary:
€1,850–€2,150 per month

Note: Includes all components: fixed compensation, variable compensation, meal allowance, remote work allowance and benefits.

What do we offer?

• An innovative and growing company with many opportunities for professional development.
• Compensation according to your experience and performance, with access to flexible remuneration and medical insurance as a social benefit.
• Unlimited access to technology training.
• 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 look for at IRIUM, regardless of your age.

If you identify with these values, this is your company!

Can we build the future together? Shall we talk?

At IRIUM, we support a world without stereotypes or limitations and believe in equality for everyone. These principles are reflected in our Equality Plan and Code of Ethics, ensuring equal treatment and opportunities regardless of any personal, physical or social condition.

Regime de trabalho híbrido.