Senior Fullstack Java

act digital; Lisboa; On-site; EUR 60,000 - 90,000; Full time

Job summary

act digital in Lisboa is seeking an experienced Senior Java Fullstack Developer to drive the development of business-critical applications. The role combines Java/Spring Boot backend expertise with Angular frontend development, participating in architecture, system design, REST API development, and technical decision-making.

You will work closely with Developers, Architects, QA teams, and business stakeholders in an Agile environment to deliver scalable, maintainable, and high-quality solutions.

Qualifications

• 8+ years of professional Fullstack Development experience.
• Strong expertise in Java.
• Hands-on with Spring Boot, JPA and Hibernate.
• Strong experience with Angular 2+.
• Experience building REST APIs and Swagger.

Responsibilities

• Design and develop robust, scalable, high-quality applications.
• Build backend services using Java and Spring Boot.
• Develop modern frontend applications with Angular.
• Design and implement REST APIs.
• Contribute to software architecture and system design decisions.
• Build and evolve microservices-based solutions.
• Promote engineering best practices and code quality.
• Collaborate with multidisciplinary teams and business stakeholders.

Skills

Java

Spring Boot

Angular 2+

REST APIs

Microservices

Object-Oriented Programming

Design Patterns

Git

Tools

Docker

Kubernetes/OpenShift

Maven

Jenkins

Swagger

SonarQube

Job description

We are looking for an experienced Senior Java Fullstack Developer to join teams responsible for the development and evolution of business-critical applications.

This is a senior, hands-on role combining strong Java/Spring Boot backend expertise with solid Angular frontend development. You will contribute not only to application development, but also to architecture, system design, REST API development, technical decision-making, and complex problem-solving.

You will work closely with Developers, Architects, QA teams, and business stakeholders, helping deliver scalable, maintainable, and high-quality solutions in an Agile environment.

As a Senior Java Fullstack Developer, you will:

• Design and develop robust, scalable, and high-quality applications.
• Build backend services using Java and Spring Boot.
• Develop modern frontend applications with Angular.
• Design and implement REST APIs.
• Contribute to software architecture and system design decisions.
• Build and evolve microservices-based solutions.
• Solve complex technical challenges and improve existing applications.
• Promote engineering best practices and code quality.
• Collaborate closely with multidisciplinary teams and business users.
• Design, develop, and maintain applications using Java and Spring Boot.
• Build scalable and high-performance backend services.
• Work extensively with:
• Java
• Spring Boot
• JPA
• Hibernate
• Apply Object-Oriented Programming principles and software design patterns.
• Develop reusable, maintainable, and testable components.
• Contribute to the modernization and continuous improvement of existing applications.

Frontend Development

• Develop and maintain frontend applications using Angular 2+.
• Build responsive, scalable, and maintainable user interfaces.
• Integrate Angular applications with backend services and APIs.
• Ensure consistency between frontend implementation and functional requirements.
• Contribute to frontend quality, performance, and maintainability.

APIs & Integration

• Design, develop, and maintain REST APIs.
• Create and maintain API documentation using Swagger.
• Support integrations between applications, microservices, and external systems.
• Troubleshoot integration issues and identify sustainable solutions.
• Apply API development best practices around security, maintainability, and versioning.
• Contribute to the design and evolution of microservices architectures.
• Participate actively in architecture and system design discussions.
• Evaluate different technical solutions and architectural trade-offs.
• Apply appropriate software design patterns and engineering principles.
• Ensure solutions are scalable, resilient, and maintainable.
• Contribute to technical standards and architectural consistency across applications.

Concurrency & Performance

• Develop backend solutions involving multithreading and concurrent processing.
• Identify and troubleshoot performance bottlenecks.
• Optimize backend services and application processes.
• Contribute to application stability and performance improvements.

Containers & Orchestration

• Build and support containerized applications using Docker.
• Work with applications deployed on:
• OpenShift
• Collaborate with DevOps teams on application deployment and platform improvements.
• Contribute to cloud-native application design and production readiness.

CI/CD & Code Quality

• Work with engineering and delivery tools such as:
• Git
• Maven
• SonarQube
• Jenkins
• Contribute to CI/CD processes and deployment automation.
• Participate actively in code reviews.
• Promote development standards and engineering best practices.
• Identify technical debt and opportunities for continuous improvement.
• Maintain high standards of code quality and maintainability.
• Work within multidisciplinary Agile teams.
• Participate in planning, refinement, reviews, and other Agile ceremonies.
• Collaborate with Developers, Architects, QA Engineers, and Business stakeholders.
• Contribute to technical estimations and solution definition.
• Share knowledge and provide technical guidance to other team members.

What We’re Looking For

Mandatory Requirements

• 8+ years of professional Fullstack Development experience.
• Strong expertise in Java.
• Solid hands-on experience with:
• Spring Boot
• JPA
• Hibernate
• Strong experience with Angular 2+.
• Experience designing and developing REST APIs.
• Knowledge of Swagger.
• Experience with Microservices Architecture.
• Strong understanding of:
• Object-Oriented Programming
• Multithreading
• Software Design Patterns
• Experience with:
• Git
• Maven
• SonarQube
• Jenkins
• Hands-on experience with Docker.
• Experience with Kubernetes and/or OpenShift.
• Experience working in Agile environments.
• Java
• Spring Boot
• JPA
• Hibernate
• REST APIs

Frontend

• Angular 2+
• Frontend Development
• REST API Integration
• Microservices
• Object-Oriented Programming
• Multithreading
• Software Architecture
• System Design
• Design Patterns

DevOps & Delivery

• Git
• Maven
• Jenkins
• SonarQube
• CI/CD

Containers & Platforms

• Docker
• OpenShift

Nice to Have

• Strong System Design knowledge.
• Experience with distributed and highly available systems.
• Experience working within international and multidisciplinary teams.
• Previous mentoring or technical leadership responsibilities.
• French: Nice to have

Technical Ownership

• High degree of autonomy when solving complex technical challenges.
• Ability to take ownership of components and technical solutions.
• Hands-on and delivery-oriented mindset.

Architectural Thinking

• Comfortable discussing architecture, scalability, performance, and maintainability.
• Ability to evaluate technical alternatives and architectural trade-offs.
• Broader engineering perspective beyond individual features.

Problem Solving

• Strong analytical and troubleshooting capabilities.
• Pragmatic approach to technically complex problems.
• Focus on sustainable solutions rather than short-term fixes.
• Strong communication with both technical and business stakeholders.
• Collaborative mindset and strong team spirit.
• Comfortable working within multidisciplinary and international environments.
• Proactive approach to identifying technical improvements.
• Strong commitment to code quality and technical excellence.