Senior Java Software Engineer

2 weeks ago

Thessaloniki, Central Macedonia, Greece inventYOU IT Consulting Full time €60,000 - €80,000 per year

We are seeking a
Senior Java Software Engineer
with proven expertise in
performance optimization, scalability
, and
system reliability
. You will play a key role in fine-tuning high-load, distributed systems and ensuring smooth performance across mission-critical applications.

This is an ideal role for engineers who are passionate about improving performance at scale, have deep knowledge of Java ecosystems, and enjoy solving architectural challenges in distributed environments.

*Your key responsibilities will be:*

  • Optimize performance and scalability of enterprise-grade applications.
  • Improve distributed application performance running on WildFly and Spring Boot.
  • Implement robust containerized deployments using Kubernetes and Docker.
  • Fine-tune and profile JVM behavior, garbage collection, and thread performance.
  • Design and implement scalable, secure system architectures.
  • Develop and monitor using tools such as Grafana, ELK Stack, and jMeter/Gatling.
  • Work with Redis, RabbitMQ, and streaming/event-driven architectures.
  • Perform deep Oracle SQL tuning, indexing, and query optimization.
  • Collaborate closely with cross-functional teams in Agile environments.
  • Contribute to Clean Code practices, system documentation, and technical excellence

Requirements

  • 5+ years of professional experience in Java software engineering.
  • Strong background in Java (versions 8 to 21+), including legacy and modern features.
  • Hands-on experience with containerizing monoliths and building scalable microservices.
  • Expert in Oracle SQL performance tuning.
  • Experience with OAuth2 / OIDC for authentication and authorization.
  • Solid command of Gradle, Maven, and Git workflows.
  • Familiarity with Linux systems and bash scripting.
  • Excellent understanding of HTTP protocols, RESTful APIs, and message-based systems.
  • Strong communication and collaboration skills across technical and non-technical stakeholders.
  • Strong system design and documentation capabilities

*You will be a great candidate for us if you:*

  • Thrive in performance-critical, distributed environments.
  • Have a passion for deep-dive debugging and architecture optimization.
  • Are confident working with complex infrastructure and container platforms.
  • Are quality-driven and embrace Clean Code principles.
  • Can explain complex technical concepts to both engineers and business stakeholders.
  • Bring a team-player attitude and a continuous improvement mindset

Benefits
*Why join inventYOU?*

  • Tackle challenging enterprise projects and impact high-load systems
  • Work alongside skilled professionals in backend, DevOps, and cloud engineering
  • Grow your expertise in cutting-edge technologies
  • Light hybrid work model

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