Hybrid Senior Java Engineer

at Hack The Box

• Job title: Senior Java Engineer
• Job type: Full Time
• Experience level: Senior
• Salary: Not specified
• Degree requirement: Bachelor's Degree
• Tech skills: Cloud, Distributed Systems, Docker, Java, Kafka, Kubernetes, Microservices, Spring, Spring Boot, SpringBoot
• Location requirements: Hybrid, Palaio Faliro, Greece

About the role

• Senior Java Engineer designing microservices for Hack The Box's cybersecurity platform. Collaborating with teams to ensure high quality and resilience in software development and integration.

Responsibilities

• Design and build new Spring Boot microservices, applying patterns that ensure consistency, resilience, and scalability.
• Shape the API Gateway layer, enabling secure routing, composition, and cross-cutting concerns for our platform.
• Collaborate with architects and teams to define service boundaries and integration strategies aligned with business needs.
• Modernize legacy systems incrementally using strangler fig and anti-corruption layer patterns, no big bang rewrites.
• Champion code quality through reviews, best practices, and hands-on guidance that elevates the entire team.
• Partner with SRE, Platform, and QA to keep services observable, testable, and production-ready.
• Contribute to architectural decisions, documenting trade-offs and communicating direction clearly.
• Mentor fellow engineers, sharing knowledge on microservices, Spring ecosystem, and clean code practices.

Requirements

• Solid experience with Java and the Spring ecosystem (Spring Boot, Spring Cloud, Spring Data, Spring Security) in production environments.
• Hands-on experience designing and building microservices, with practical knowledge of patterns like Saga, CQRS, Transactional Outbox, and API Gateway.
• Strong understanding of distributed systems challenges—data consistency, service communication, resilience, and fault tolerance.
• Experience with messaging systems (e.g., Kafka) and event-driven architectures.
• Familiarity with containerization and orchestration (Docker, Kubernetes) and CI/CD pipelines.
• Ability to communicate architectural decisions clearly, whether through diagrams, documentation, or conversations with technical and non-technical stakeholders.
• A track record of mentoring or guiding other engineers—you don't just write great code, you help others do the same.

Benefits

• Private insurance
• 25 annual leave days
• Dedicated budget for training and professional development, participation in conferences
• State-of-the-art equipment (Macbook, iPhone, and mobile plan)
• Free lunch & snacks at the office
• Full access to the Hack The Box lab offerings; so you can learn how to hack
• Flexible/Hybrid working