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Senior Java Backend Engineer Job Opening In Lisbon – Now Hiring Penguin Formula


Job description

Job Description

We are looking for a Senior Java Developer to join our internal team on a REMOTE work model from anywhere of the EU.

 Design, develop, and maintain the Java backend (Spring Boot or similar frameworks).

 Develop and optimize REST APIs to support the Angular frontend and external services.

 Integrate with AI/ML services exposed via REST at a later stage (OpenAI, Ollama, vLLM, Hugging Face, etc.).

 Ensure scalability, performance, and resilience in hybrid architectures (cloud + on-premises).

 Implement secure handling of sensitive data, respecting privacy and compliance requirements (e.g., GDPR).

 Optimize persistence and queries in relational (e.g., PostgreSQL, MySQL) or NoSQL databases.

 Design monitoring, logging, and error-handling mechanisms for production systems.

 Support CI/CD pipelines and contribute to infrastructure automation in AWS.


Qualifications

 5+ years of professional experience as a Java Backend Engineer.

 Strong proficiency in Java 11+ (preferably 17+) and frameworks like Spring Boot.

 Solid understanding of REST API design and integration.

 Experience with database systems (SQL and/or NoSQL).

 Hands-on experience with cloud environments (AWS preferred).

 Experience consuming and integrating external APIs (REST/JSON).

 Familiarity with microservices architecture and distributed systems.

 Good knowledge of security best practices (authentication, authorization,

encryption).

 Ability to mentor and support junior developers.

 Strong problem-solving and debugging skills.

Nice to Have: 

 Experience integrating with AI/ML services (e.g., OpenAI, Ollama).

 Knowledge of Python (for collaboration with AI Engineers).

 Familiarity with Angular (basic knowledge for collaboration with frontend).

 Experience with Docker and Kubernetes.

 Understanding of event-driven architectures (Kafka, RabbitMQ).

 Experience with enterprise deployments (on-premises + offline mode).

 Knowledge of advanced AWS services.

Ideal Profile:

 Solution-oriented with strong problem-solving skills.

 Able to work autonomously and take technical ownership.

 Comfortable collaborating with cross-functional teams.

 Proactive and capable of leading backend-related decisions.

 Strong communicator, especially when working with AI and frontend teams.

 Pragmatic mindset — balances best practices with delivering value quickly.

 Curious about new technologies and eager to learn about AI integration.



Additional Information

If you meet the above criteria and are ready for an exciting opportunity in a dynamic environment, submit your CV!

Required Skill Profession

Computer Occupations


  • Job Details

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Unlock Your Senior Java Potential: Insight & Career Growth Guide


Real-time Senior Java Jobs Trends (Graphical Representation)

Explore profound insights with Expertini's real-time, in-depth analysis, showcased through the graph here. Uncover the dynamic job market trends for Senior Java in Lisbon, Portugal, highlighting market share and opportunities for professionals in Senior Java roles.

2887 Jobs in Portugal
2887
1142 Jobs in Lisbon
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Are You Looking for Senior Java Backend Engineer Job?

Great news! is currently hiring and seeking a Senior Java Backend Engineer to join their team. Feel free to download the job details.

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The Work Culture

An organization's rules and standards set how people should be treated in the office and how different situations should be handled. The work culture at Penguin Formula adheres to the cultural norms as outlined by Expertini.

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2. Loyalty

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