Senior Backend & Cybersecurity Integration Developer

iKnowHow Group is a dynamic, international technology company with 24+ years of experience and a team of 300+ talented professionals delivering innovative technology solutions across Energy, Telecommunications, Banking & Financial Services, and the Public Sector. Through its specialized subsidiaries, it brings domain expertise in areas such as Health and Robotics, blending deep industry knowledge with advanced, future-ready technologies. At its core, iKnowHow S.A. delivers end-to-end project development - both internal and client-facing - turning strategy into scalable, real-world solutions. Our portfolio spans Data & AI platforms, enterprise integration, cloud-native applications, and large-scale digital transformation initiatives, enabling leading organizations across the public and private sectors to evolve and grow. We are now looking for a talented Senior Backend & Cybersecurity Integration Developer to join our internal team. Responsibilities: Design and development of backend services and microservices for cybersecurity applications Development of REST APIs and event-driven interfaces between SIEM, SOAR, AI/ML and external systems Integration with SIEM platforms, including security-event ingestion, parsing, normalization, enrichment and incident interfaces Integration with SOAR platforms, including incidents/cases, playbooks, response workflows and enforcement connectors Implementation of the Cyber Incident Package (CIP) interface between the security analytics and response domains Implementation of response and enforcement APIs for network, IAM, security and platform controls Development of services supporting incident management, response orchestration, execution tracking and response verification Integration of AI/ML analytical outputs such as anomaly scores, behavioral indicators, threat classifications and confidence scores into operational workflows Implementation of secure service-to-service communication, authentication, authorization and audit mechanisms Development of connectors/adapters for heterogeneous cybersecurity and infrastructure systems Contribution to system architecture, API specifications, data models, automated testing, integration testing and technical documentation Collaboration with cybersecurity engineers, AI/ML engineers, system architects and other European project partners Requirements Degree in Computer Science, Software Engineering, Computer Engineering or a related field At least 4 years of Java/Spring boot development experience Experience designing and implementing RESTful APIs Experience with microservices and distributed systems Good understanding of event-driven architectures and asynchronous messaging Experience with relational and/or NoSQL databases Experience with Docker and Linux environments Familiarity with authentication and authorization technologies such as OAuth 2.0, OpenID Connect, JWT and PKI/certificates Understanding of cybersecurity concepts including security events, alerts, incidents, logs, network security and access control Good written and spoken English Experience in one or more of the following areas will be considered a strong advantage: SIEM technologies SOAR platforms and security orchestration/playbook development Kafka, RabbitMQ or equivalent messaging/event-streaming technologies Elasticsearch / OpenSearch IDS/IPS/NDR technologies and integration with security telemetry Threat Intelligence and standards such as STIX/TAXII Cybersecurity frameworks such as MITRE ATT&CK Integration with IAM, firewall, network-management or endpoint-security APIs Kubernetes DevSecOps and CI/CD pipelines AI/ML integration in production systems Defence, C4ISR, mission-critical or EU research projects 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 Stable and enjoyable working environment