Senior Back-End Engineer

99X Technology; Portugal; Presencial; EUR 40 000 - 60 000; Tempo integral

Resumo da oferta

99X Technology in Lisbon is looking for a Backend Java Engineer to design and maintain scalable backend services. The role involves building robust solutions, ensuring code quality, and optimizing performance.

Successful candidates will have over 3 years of experience, strong expertise in Java, Quarkus, and Spring Boot, along with excellent problem-solving and communication skills. A degree in Computer Engineering or Computer Science is a plus.

If you are proactive and team-oriented with a passion for continuous improvement, we want to hear from you!

Qualificações

• 3+ years of experience in a Backend Software Engineering role.
• Strong knowledge of Java fundamentals.
• Hands-on experience in the design of scalable backend services.
• Fluent English proficiency (mandatory, minimum B2 level).

Responsabilidades

• Design, develop, and maintain scalable backend services and APIs.
• Ensure application reliability and performance.
• Promote continuous improvement initiatives.
• Analyze and resolve complex application issues.
• Support backend architecture evolution.

Conhecimentos

Java fundamentals

Quarkus

Spring Boot

Automated testing

Performance optimization

Root cause analysis

Collaboration

Problem-solving

Interpersonal skills

Fluent English (B2)

Formação académica

Degree in Computer Engineering, Computer Science, or related field

Ferramentas

CI/CD pipelines

Cloud environments (preferably Azure)

Descrição da oferta de emprego

We are looking for a Backend Java Engineer to join our team and help design, develop, and maintain scalable, high-performance backend services that support critical business applications.

In this role, you will be responsible for building robust and efficient solutions, ensuring code quality, and contributing to the continuous improvement of our software development practices. You will work closely with cross-functional teams in a dynamic and international environment.

The role combines backend development, software engineering best practices, and operational excellence, with a strong focus on scalability, maintainability, and performance.

Responsibilities:

Design, develop, and maintain scalable backend services and APIs using Java frameworks such as:

• Quarkus
• Spring Boot

Ensure application reliability, performance, and scalability across all environments

Promote and implement continuous improvement initiatives within the software development lifecycle

Apply software engineering best practices to:

• Develop high-quality code
• Improve maintainability

Analyze, troubleshoot, and resolve complex application issues

• Conduct root cause analysis
• Perform post-mortem activities to prevent recurrence

Monitor and optimize application performance and resource utilization

Support the evolution of backend architecture and future technical decisions

Ensure code quality through:

• Automated testing

Collaborate with:

• Developers
• Architects
• Product Owners
• Managers
• External stakeholders

Ensure timely delivery and alignment across distributed teams

Participate in production support and incident resolution activities when required

Requirements:

3+ years of experience in a Backend Software Engineering role

Strong knowledge of Java fundamentals, including:

• Collections
• Classes
• Interfaces
• Enums
• Inheritance

Hands-on experience in the design, development, and operation of scalable backend services using:

• Quarkus
• Spring Boot

Solid understanding of:

• Databases
• Data persistence concepts

Experience ensuring code quality through:

• Automated testing
• Code reviews

Strong experience in:

• Performance optimization
• Root cause analysis

Excellent problem-solving and analytical skills

Ability to work with:

• Autonomy and ownership
• Proactivity and leadership
• Collaboration and a continuous improvement mindset

Excellent communication and interpersonal skills

Strong presentation abilities

Team-oriented attitude

Fluent English proficiency (mandatory, minimum B2 level)

Nice-to-have:

Degree in Computer Engineering, Computer Science, or a related field

Experience with cloud environments (preferably Azure)

Knowledge of containerized applications and microservices architectures

Experience with CI/CD pipelines and DevOps practices

Familiarity with Agile methodologies

Experience working in large-scale or enterprise environments

Strong focus on innovation, automation, and continuous improvement

If this sounds like you, share your CV with us and let's talk!