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Urgent! Senior Java Developer (Dublin) Position in Dublin - Datalex

Senior Java Developer (Dublin)



Job description

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

Location: Dublin or Manchester (Hybrid) 

Department: Engineering 

Reports to: Engineering Manager 

About the Role 

We are seeking a highly skilled Senior Java Developer to lead the modernization of our legacy monolithic architecture by decomposing SOAP-based services into stateless RESTful microservices.

You will be responsible for transitioning our legacy SOAP-based services to RESTful, scalable microservices using Spring Boot, deployed in AWS via Docker and Kubernetes (or ECS).

This is a high-impact role where your expertise will directly influence system scalability, performance, and developer experience.

Key Responsibilities 

API Development & Architecture 

  •  Apply domain-driven design and stateless principles to migrate business functionality from the monolith to a modern architecture 

  • Lead the decomposition of tightly coupled SOAP services into independently deployable microservices 

  • Design and implement scalable, stateless REST APIs using Spring Boot and SwaggerHub 

  • Lead the transformation from SOAP/XML to REST/JSON for internal and external APIs 

  • Serve as the front controller for managing requests and orchestrating backend service flows 

  • Microservices & Cloud Deployment 

  • Develop and deploy containerized microservices using Docker and Kubernetes, or AWS ECS 

  • Implement cloud-native architecture patterns for high availability, fault tolerance, and scalability in AWS 

  • Integrate with API Gateway, Lambda, and CloudFormation or other IaC tools for provisioning infrastructure 

  • Testing & Quality 

  • Write comprehensive integration, unit, and API tests using JUnit, Mockito, Postman, etc.

  • Debug REST-to-SOAP interactions to ensure seamless migration and data integrity 

  • Champion CI/CD and test automation practices across the team 

  • Performance, Caching & DevOps 

  • Optimize performance with caching solutions (e.g., Redis, Memcached) 

  • Maintain stateless service architecture principles 

  • Contribute to observability with Prometheus, Grafana, and ELK Stack 

  • Collaboration & Leadership 

  • Collaborate closely with product, QA, DevOps, and platform teams 

  •  Mentor junior engineers and support technical decision-making across sprints 

  • • Advocate for engineering excellence, TDD, and best practices in software delivery 

  • Required Skills & Experience 

  • Experience leading end-to-end migration projects from SOAP-based systems to scalable, domain-aligned microservices 

  • Proven experience decomposing monolithic applications and rebuilding them as RESTful microservices 

  • 7+ years in Java development with strong expertise in Spring Boot 

  • Strong knowledge of REST architecture principles and best practices 

  • Proven experience designing and building REST APIs at scale 

  • Deep understanding of SOAP-to-REST transformations 

  • Hands-on with Docker and either Kubernetes or AWS ECS (Elastic Container Service) 

  • Proficiency in one or more Infrastructure as Code (IaC) frameworks: Terraform, AWS CloudFormation, or AWS CDK 

  • Strong database knowledge: PostgreSQL, MySQL, MongoDB, Redis 

  • Proficient with CI/CD tools (e.g., Jenkins, GitLab CI, AWS CodePipeline) 

  • Strong testing discipline with tools like JUnit, Mockito, Postman, or Karate 

  • Experience with OAuth2, JWT, OpenID Connect 

  • Familiarity with Java 8+ and awareness of Java 11/17 improvements 

  • Preferred Skills 

  • Experience with API Gateways (AWS API Gateway, Kong) 

  • Knowledge of Kafka, RabbitMQ 

  • Experience with serverless architectures (e.g., AWS Lambda) 

  • Broader experience with Infrastructure as Code tooling and best practices 


  • Required Skill Profession

    Computer Occupations



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