In Cyclad, we work with top international IT companies in order to boost their potential in delivering outstanding, cutting-edge technologies that shape the world of the future. We are seeking an experienced Senior Backend Developer to join a remote development team. The role focuses on designing and building core backend services for ORA, enabling secure cloud integration with SEF using KMIP and Barbican.  Project information:  Type of project: IT services  Office location: Warszawa  Work mode: Remote  Budget: 160-180 PLN net /h - b2b  Project length: Long-term   Only candidates with citizenship in the European Union and residence in Poland  Start date: ASAP (depending on the candidate's availability)   Project scope:  Design and implement backend services for ORA core, integrating with KMS via KMIP for services such as Barbican and Ceph  Develop and maintain Kubernetes-based infrastructure, including Custom Resource Definitions (CRDs), operators, and controllers  Build secure communication layers leveraging TLS and advanced data encryption techniques  Collaborate with architecture and infrastructure teams to ensure seamless integration across management layers  Implement unit and integration tests to ensure code quality and reliability  Contribute to system design decisions and provide technical leadership for backend architecture  Requirements:  Strong backend development experience in Java, Golang, or Python   Solid understanding of cryptography, e.g., TLS, data encryption  Hands-on experience with Kubernetes, including infrastructure and management layers  Experience with OpenStack  Experience in unit and integration testing for backend services  Ability to work on complex distributed systems and core services  Strong logical thinking, independence, and problem-solving skills  Fluent in English (minimum C1)  We offer:  Remote working model  Full-time job agreement based on b2b  Private medical care with dental care (covering 70% of costs) + rehabilitation package. Family package option possible  Multisport card (also for an accompanying person)  Life insurance