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.