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