Java Developer at Datalex

Java Developer – Spring Boot, REST API, Kubernetes/AWS 

Location: Dublin or Manchester (Hybrid) 

Department: Engineering 

Reports to: Engineering Manager 

About the Role 

We are looking for a skilled and motivated Java Developer to contribute to the modernization of our backend architecture. You will support the transformation of SOAP-based services into RESTful microservices using Spring Boot, working in a cloud-native environment built on Docker, Kubernetes (or ECS), and AWS. Our platform consists of multiple distributed services which process millions of requests per hour. This is a great opportunity to deepen your experience in scalable systems and modern development practices while learning from senior engineers. 

Key Responsibilities 

API Development & Architecture 

• Assist in designing and implementing REST APIs using Spring Boot and SwaggerHub 

• Contribute to the transformation of SOAP/XML to REST/JSON for backend services 

• Support API development and integration in a microservices environment 

Microservices & Cloud Deployment 

• Contribute to containerized microservice development using Docker and Kubernetes, or AWS ECS 

• Participate in deploying and managing services on AWS cloud infrastructure 

• Collaborate on integrating with API Gateway, Lambda, and IaC tools like CloudFormation 

Testing & Quality 

• Write and maintain integration and unit tests using tools such as JUnit and Mockito 

• Assist with debugging API issues and ensuring accurate data transformations 

• Work with the team to implement CI/CD and automation practices 

Performance, Caching & DevOps 

• Support performance tuning and catching solutions (e.g., Redis) 

• Contribute to stateless microservice design and improvements 

• Help monitor application health using tools like Prometheus or ELK Stack 

Collaboration & Learning 

• Work closely with senior engineers, QA, and product teams 

• Actively participate in agile ceremonies and sprint planning 

• Engage in peer reviews, mentorship opportunities, and continuous learning 

Required Skills & Experience 

• 3+ years in Java development with Spring Boot 

• Understanding of REST architecture principles and best practices 

• Experience building REST APIs and integrating with JSON-based services 

• Exposure to SOAP-to-REST migration or service transformation projects 

• Hands-on with Docker and familiarity with Kubernetes or AWS ECS 

• Basic knowledge of Infrastructure as Code (IaC) tools like Terraform or CloudFormation 

• Familiarity with relational and NoSQL databases: PostgreSQL, MySQL, MongoDB, or Redis 

• Experience with CI/CD pipelines and tools such as Jenkins or GitLab CI 

• Proficiency in unit and integration testing (e.g., JUnit, Mockito) 

• Understanding of authentication protocols like OAuth2 or JWT 

• Working knowledge of Java 8+ 

Preferred Skills 

• Experience with API Gateways (e.g., AWS API Gateway) 

• Familiarity with messaging systems like Kafka or RabbitMQ 

• Basic understanding of serverless technologies (e.g., AWS Lambda) 

• Interest in evolving DevOps, automation, and cloud-native best practices 

About Datalex 

Datalex's purpose is to transform airline retail. Datalex is a market leader in airline retail technology, offering unique products that enable airlines to drive revenue and profit as digital retailers. Datalex has a strong track record of delivering digital retail transformation for progressive airline brands worldwide, including Aer Lingus, easyJet, JetBlue Airways, Air China, Edelweiss, Air Transat, and Air Macau. The Group is headquartered in Dublin, Ireland, and maintains offices across Europe, the USA and China. In 2024, Datalex was awarded the 'Great Place to Work and 'Best Workplaces in Tech' certifications. Datalex plc is a publicly listed company, on Euronext Growth, Dublin. Learn more at www.datalex.com or follow on LinkedIn @Datalex.