Solas IT Recruitment
Senior Backend Java Developer
12-month daily-rate contract in Dublin (hybrid, 3 days/week onsite) for a Senior Backend Java Developer designing enterprise applications, REST APIs and event-driven services. Core stack: Java 17/21, Spring Boot, Kafka, IBM MQ, Oracle/PostgreSQL, Docker/Kubernetes and CI/CD.
- Compensation
- Not disclosed
- Location
- Dublin, Ireland
- Work setup
- Not specified
- Seniority
- Senior
- Employment
- Contract
- Experience
- 10+ years
- Category
- Backend
- Posted
Skills
Must have
- 10+ years designing and developing enterprise Java systems
- Strong Core Java skills with hands-on Java 17 or 21 (Java 21 preferred)
- Experience with Spring, Spring Boot and Jakarta EE (ideally Spring Framework 7 and Spring Boot 4.x)
- Knowledge of JVM internals, garbage collection tuning and performance profiling
- Strong SQL and database experience with Oracle, PostgreSQL or MySQL, including PL/SQL where applicable
- Experience with JPA/Hibernate, HikariCP and migration tools such as Flyway or Liquibase
- Experience with Kafka and IBM MQ, including partitioning, consumer groups, idempotency and transactional outbox patterns
- Knowledge of Spring Security, OAuth2/OIDC, JWT and access controls
- API design with OpenAPI/Swagger and resilience patterns with Resilience4j
- Automated testing with JUnit 5, Mockito, AssertJ, Testcontainers and contract testing tools
- Experience with Docker, Kubernetes and/or Red Hat OpenShift
- Familiarity with CI/CD tools such as Jenkins, GitHub Actions, GitLab CI or ArgoCD
- Practical experience with AI-assisted development tools (Claude, GitHub Copilot, Devin or Cursor)
- Experience working in Agile teams across the full SDLC
Nice to have
- Redis, MongoDB or Elasticsearch
- Micrometer, Prometheus, Grafana and OpenTelemetry
- Spring AI, LLM integrations, RAG workflows or vector databases such as pgvector
Full description
Senior Backend Java Developer – 12-Month Daily Rate Contract
Contract: 12 months
Working arrangement: Hybrid – 3 days per week onsite Dublin City Centre
We are recruiting a Senior Backend Java Developer to design and deliver enterprise applications and distributed services. This opportunity suits an experienced developer with strong Core Java skills and experience building secure APIs and event-driven systems.
Key Responsibilities
- Design, develop and maintain scalable Java applications and RESTful services.
- Build event-driven integrations using Apache Kafka and IBM MQ.
- Improve application performance, reliability and security.
- Develop database schemas, queries and persistence layers.
- Write automated tests and contribute to code reviews and engineering standards.
- Support containerised deployments and CI/CD pipelines.
- Collaborate with distributed teams throughout the software development lifecycle.
Key Requirements
- 10+ years’ experience designing and developing enterprise Java systems.
- Strong Core Java skills, with hands‑on experience using Java 17 or 21, preferably Java 21.
- Experience with Spring, Spring Boot and Jakarta EE, ideally including Spring Framework 7 and Spring Boot 4.x.
- Knowledge of JVM internals, garbage collection tuning and performance profiling.
- Strong SQL and database experience with Oracle, PostgreSQL or MySQL, including PL/SQL where applicable.
- Experience with JPA/Hibernate, HikariCP and database migration tools such as Flyway or Liquibase.
- Experience with Kafka and IBM MQ, including partitioning, consumer groups, idempotency and transactional outbox patterns.
- Knowledge of Spring Security, OAuth2/OIDC, JWT and access controls.
- Experience designing APIs using OpenAPI/Swagger and implementing resilience patterns with Resilience4j.
- Strong automated testing skills using JUnit 5, Mockito, AssertJ, Testcontainers and contract testing tools.
- Experience with Docker, Kubernetes and/or Red Hat OpenShift.
- Familiarity with CI/CD tools such as Jenkins, GitHub Actions, GitLab CI or ArgoCD.
- Practical experience using AI-assisted development tools, such as Claude, GitHub Copilot, Devin or Cursor.
- Experience working within Agile teams and across the full SDLC.
- Redis, MongoDB or Elasticsearch.
- Micrometer, Prometheus, Grafana and OpenTelemetry.
- Spring AI, LLM integrations, RAG workflows or vector databases such as pgvector.