Senior Java Software Engineer

Careerwise Recruitment; Galway; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

CareerWise Recruitment is seeking a Senior Java Software Engineer for our Galway-based client to join dynamic R&D teams spanning Data Engineering, Data Science, Firmware/IoT, DevOps, UX, and Cybersecurity. The role focuses on designing, scaling, and maintaining resilient microservices powering millions of connected assets in real time.

The ideal candidate has 5+ years in Java with Spring, strong API and microservice experience, and a collaborative, Agile mindset.

Qualifications

• 5+ years of hands-on Java software development with Java 17/21 and the Spring ecosystem.
• Experience designing RESTful APIs and stateless microservices architectures.
• Strong relational database skills (PostgreSQL/MySQL/Oracle) and data modelling.
• Testing mindset with unit/integration testing (JUnit, Mockito) and performance benchmarking.
• Proficient with Git, Maven/Gradle, Docker, and CI/CD pipelines.

Responsibilities

• Architect secure, multi-tenant microservices and RESTful APIs.
• Develop robust Java/Spring Boot backend in production-grade code.
• Establish automated tests and diagnose distributed systems across services.
• Collaborate with DevOps to maintain CI/CD pipelines and containerized deployments.
• Provide technical leadership and mentorship in an Agile Scrum environment.
• Drive features end-to-end from concept to production within a fast-paced team.

Skills

Java 17+/21+

Spring Boot

RESTful APIs

Relational databases

JUnit/Mockito

Git

Maven/Gradle

Linux/Windows

Agile/Scrum

Education

Bachelor's degree in Computer Science

Tools

Docker

Kubernetes

CI/CD tools

AWS

Job description

A Senior Java Software Engineer is required by CareerWise Recruitment for our Galway based client. The Senior Java Software Engineer will join R&D teams and collaborate with specialists across Data Engineering, Data Science, Firmware/IoT, DevOps, UX, and Product Cybersecurity to design, scale, and maintain resilient microservices powering millions of connected assets and global transport units in real time. This role is based ON-SITE Monday to Thursday, work onsite with your colleagues & Fridays, choose your work location, balancing what your work requires.

THE ROLE:

• Architecture & Scalable System Design: Partner with Product Management, Technical Architects, and engineering peers to architect secure, stateless, and high-performance multi-tenant microservices and RESTful APIs capable of processing massive telematics streams.
• Core Backend Development: Deliver robust, maintainable, and production-grade code utilizing modern Java and Spring Boot, adhering to industry-leading design principles, code reuse patterns, and domain boundaries.
• Resilience & Quality Engineering: Establish automated testing standards (unit, integration, and performance benchmarking) and diagnose complex issues across distributed, asynchronous workflows.
• CI/CD & DevOps Automation: Collaborate closely with DevOps to build and maintain secure CI/CD pipelines, containerized environments, and cloud deployment lifecycles.
• Technical Leadership & Mentorship: Champion engineering excellence through constructive code reviews, architectural discussions, knowledge sharing, and active mentoring of junior and mid-level software engineers.
• Agile Collaboration: Drive features from concept to production within a fast-paced Agile Scrum framework, collaborating cross-functionally across firmware, cloud services, and user interfaces.

REQUIREMENTS:

• Java & Enterprise Ecosystem: 5+ years of hands-on software development experience with Java (Java 17/21+) and the core Spring framework (Spring Boot, Spring Security, Spring Data).
• Distributed Architecture & APIs: Demonstrated experience designing, implementing, and documenting RESTful APIs and stateless microservice architectures.
• Data Persistence & Relational Databases: Strong expertise in relational database modeling, complex SQL querying, indexing, and query optimization (e.g., PostgreSQL, MySQL, or Oracle).
• Testing & Quality Mindset: Proven background in test-driven practices, automated testing frameworks (JUnit, Mockito, Test containers), and robust error-handling design.
• DevOps & Tooling: Proficient with Git, standard build tools (Maven or Gradle), containerization concepts (Docker), and automated CI/CD pipelines.
• Operating Systems:: Comfortable navigating and troubleshooting across both Linux/UNIX and Windows development and server environments.
• Agile Mindset & Communication: Excellent interpersonal, verbal, and written communication skills with proven autonomy in cross-functional Agile Scrum teams.

ADDED DESIRABLE SKILLS:

• Cloud-Native Platforms: Practical experience building and deploying cloud infrastructure on AWS (e.g., ECS/EKS, Lambda, SQS, SNS, S3, RDS) or Azure.
• High-Throughput Streaming & Messaging: Familiarity with message brokers or event streaming platforms (e.g., Apache Kafka, RabbitMQ, MQTT) and IoT/telematics data pipelines.
• Multi-Tenant SaaS: Experience building multi-tenant data isolation and role-based access control (RBAC) models for enterprise SaaS.
• Front-End Familiarity: Working understanding of modern front-end technologies (e.g., React, TypeScript, HTML5/CSS3) for seamless full-stack feature collaboration.
• Observability & Scripting: Experience with observability stacks (Prometheus, Grafana, Open Telemetry, Datadog) and automation via Bash/Shell scripting.