iKnowHow Group is a leading Software & Robotics Solutions group of companies operating internationally for over 24 years, with 300+ professionals delivering innovative technology solutions across Energy, Telecommunications, Banking & Financial Services, and Public Sector industries. The group is structured into specialized subsidiaries, each focused on distinct technology domains and market verticals.
iKnowHow S.A., as the cornerstone of the group, utilizes state-of-the-art technologies and handles end-to-end internal and external project development, from conception to completion. Our portfolio spans Data & AI platforms, enterprise integration, cloud-native applications, and digital transformation initiatives for major organizations in private and public sectors.
We are now looking for a Senior Java Developer with strong technical skills and solid working experience to work in outsourced challenging projects.
Responsibilities:
- Design and build a centralized authorization system that governs identity validation and access decisions across the platform
- Implement business policy and transaction controls in a way that keeps other services simple and decoupled from security logic
- Ensure all security-relevant actions are logged, traceable, and auditable to meet enterprise compliance standards
- Optimize the system for high-speed, low-latency decision-making at scale
- Architect for high availability and resilience, ensuring the system keeps functioning during upstream outages
- Build with regulatory compliance in mind, including data protection and financial-sector requirements
- Work closely with architecture teams throughout the design and delivery process, from concept to implementation
- Turn complex security requirements into clean, maintainable code
- Uphold strong testing standards, particularly for security-critical functionality
Requirements
- Bachelor's degree in Information Technology, Computer Science, Business Administration, Engineering, or a related field
- 5+ years of hands-on Java development (newer versions)
- Deep expertise in Spring Boot application development and auto-configuration
- Hands-on experience implementing JWT-based stateless authentication, OAuth 2.1 / OIDC resource server configuration, filter chains, and method-level security
- Practical experience writing aspects for cross-cutting concerns (authorization, auditing, masking)
- Understanding of aggregates, domain services, repositories, and the importance of keeping domain objects free of infrastructure concerns
- Experience in Spring Data Redis / Lettuce
- Experience in JUnit 5, Mockito, Spring Boot Test or Test containers
- Experience deploying stateless Spring Boot services on Kubernetes
Nice to have:
- Experience with Open Policy Agent (OPA) or Drools BRMS
- Familiarity with HashiCorp Vault and spring-vault-core
- Knowledge of GDPR, DORA, or PSD2 in a technical context
- Entra ID / Azure AD OIDC integration experience
- Experience in core banking or financial services platforms
- API Gateway (policy enforcement, coarse-grained AuthZ)
Benefits
- An attractive salary package
- Private health insurance plan
- Career development and growth opportunities
- Continuous training via personalized seminars
- An amazing private & open-office workspace in Athens #LI_Hybrid
- Flexibility to a remote work model as well
- Stable and enjoyable working environment
Skills Required
- Bachelor's degree in Information Technology, Computer Science, Business Administration, Engineering, or a related field
- 5+ years of hands-on Java development experience with newer Java versions
- Deep expertise in Spring Boot application development and auto-configuration
- Hands-on experience with JWT-based stateless authentication
- Experience with OAuth 2.1 and OIDC resource server configuration
- Experience with filter chains and method-level security
- Practical experience writing aspects for authorization, auditing, and masking
- Understanding of aggregates, domain services, repositories, and domain-driven design principles
- Experience with Spring Data Redis and Lettuce
- Experience with JUnit 5, Mockito, Spring Boot Test, or Testcontainers
- Experience deploying stateless Spring Boot services on Kubernetes
- Experience with Open Policy Agent or Drools BRMS
- Familiarity with HashiCorp Vault and Spring Vault
- Technical knowledge of GDPR, DORA, or PSD2
- Experience with Entra ID or Azure AD OIDC integration
- Experience with core banking or financial services platforms
- Experience with API Gateway policy enforcement and coarse-grained authorization
What We Do
iKnowHow is a Greek technology firm based in Athens and currently employing more than 120 engineers and IT professionals. The company was founded in 2002 and has since grown rapidly holding nowadays a significant market share in Greece, Cyprus and Europe. For almost two decades, the company has been offering a wide range of tailor made software solutions and specialized ICT strategy consulting services as well as building complex enterprise applications with emphasis on Digital Government, Business Automation, Information Security, Digital Transformation, e-Health and Industrial Automation solutions. The past years the company has significantly increased in size and financial yield, reaching almost 120 employees. IKH is organized into three business units: digital government, healthcare, and robotics. Our longstanding partnership with IBM and our knowledge of Open Source technologies has allowed us to complete significant ICT work for local and international organizations. IKH Innovation, our robotics arm, is a world-class team of robotics and software engineers with expertise in mechanical design, embedded control, data-driven intelligence and mobile robots. IKH Innovation designs and builds tailor-made robotic solutions capable of performing in demanding environments. evorad™ is our comprehensive RIS / PACS suite designed to cover a radiology department's needs from the moment patients walks in to the moment they walk out with their examination and their digital diagnostic report in hand. evorad™ has become the premier PACS solution of Greek public hospitals, used not only to process thousands of examinations per day, but also as the main teaching tools in medical schools and university hospitals.
