Back-End Software Engineer

At Ayesa Digital, we grow with you. Every professional in our company is essential. Thanks to their talent, we continue to expand: today, we are a global team of more than 11,000 people working toward a shared mission. Ayesa Digital is currently participating in high-impact European Union projects designed to address major European challenges and drive science and innovation. These strategic technological initiatives stand out for their international scope and strong commitment to socially oriented results. We are looking for a highly experienced Back-End Software Engineer to join international digital transformation initiatives within a multicultural environment. The selected professional will contribute to the design, development, and evolution of modern digital solutions, playing a key role in building scalable, secure, and high-performance back-end services. Working with cutting-edge technologies and best practices in software engineering, cloud computing, data management, security, and distributed architectures, the successful candidate will support mission-critical applications within a major European institution. Key Responsibilities Develop, maintain, and optimize back-end applications and services using Java and Spring-based technologies. Design, build, and secure RESTful APIs and web services that support mission-critical business processes. Implement core business logic and scalable server-side solutions ensuring performance, reliability, and maintainability. Design and manage data storage solutions, working with both relational and NoSQL databases. Integrate front-end components with server-side logic and distributed systems.Work with Elasticsearch to build and optimize search capabilities, indexing strategies, and query performance.Develop and maintain event-driven architectures using Apache Kafka.Apply security best practices, including authentication, authorization, input validation, secure data storage, and application monitoring.Troubleshoot complex technical issues using monitoring and observability tools such as Dynatrace, Splunk, Elastic APM, and OpenTelemetry. Develop and maintain unit and integration tests and contribute to CI/CD processes to ensure software quality and reliability.Work with containerization and orchestration technologies such as Docker and Kubernetes to support application deployment and scalability. Collaborate in Agile teams within an international and multicultural environment, producing technical documentation and sharing knowledge across teams. What We Are Looking For University degree and extensive professional experience in IT environments.Minimum 5 years of experience in software development.Minimum 5 years of hands-on experience developing Java applications.Minimum 5 years of experience working with Spring Framework / Spring Boot.Minimum 3 years of experience with Elasticsearch, including indexing, search optimization, query design, and performance monitoring.Minimum 3 years of experience with Apache Kafka in distributed system architectures.Proven experience designing, developing, and securing REST APIs and web services.Strong knowledge of SQL databases such as PostgreSQL, Oracle, or MySQL, and experience working with NoSQL databases.Knowledge of OAuth 2.0, OpenID Connect, and JWT authentication standards.Experience with Docker, Kubernetes, and cloud-based application environments.Knowledge of monitoring and observability tools such as Dynatrace, Splunk, Elastic APM, or OpenTelemetry.Experience using Git workflows and working within Agile development environments.Strong analytical and problem-solving skills with a focus on code quality, scalability, and performance.Excellent communication skills and the ability to work effectively both independently and as part of a multicultural team.English level B2 or higher. French would be considered an asset.AWS Certified Developer Associate, Microsoft Azure Developer Associate, CKAD certification, or equivalent will be considered a plus. What We Offer The opportunity to work on high-profile European Union digital transformation projects.An international, multicultural and collaborative working environment.Exposure to cutting-edge technologies, modern architectures and best engineering practices.Continuous learning and professional growth opportunities.Participation in impactful projects that contribute to innovation and public value across Europe. If you are ambitious, enthusiastic, and seeking a new professional challenge in international projects with real-world impact, this is the place for you! In accordance with Organic Law 3/2007 of March 22, the company is committed to promoting the defense and effective application of the principle of equality between men and women, preventing any type of labor discrimination based on sex, and guaranteeing equal entry opportunities. Furthermore, we promote diversity and reject any discrimination based on race, gender, functional diversity, religion, sexual orientation, gender identity, or any other personal or social condition, striving to build an inclusive and enriching environment.