Senior Java Backend Engineer

Company Description

WeCookiT is an international software house that delivers software development to its corporate customers by providing highly skilled, communicative IT professionals to build their customized products through outsourcing, nearshoring and turn-key projects’ solutions.

How do we differentiate ourselves? By investing in the professional growth and personal care of our software developers. We provide them with a premium service so that they can do the same for our customers.

Our talented team holds software engineers and sales experts, spread across offices in Europe and South America, and we represent a go-getting and driven company who aims to be an inspiring software house, knowing our future relies on IT.

WeCookiT stand for growth, support, dynamic, companionship and communication. Our head office is located in Portugal in the heart of Lisbon (Avenida da Liberdade) and we work mainly for the European market.

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!