Senior Java Developer (Security Platform)

Sigma Software

1d•Remote

About The Position

We are looking for a Senior Java Developer to join our team and work on a cutting-edge security platform. This is a remote role open to candidates across Europe and Ukraine. At Sigma Software, we create innovative solutions for complex ecosystems, ensuring security, scalability, and compliance at every step. You will be part of a talented engineering group designing the unified access layer for distributed services. You will work on a mission-critical project with advanced security architecture, collaborate with skilled professionals, and contribute to a platform that supports global-scale operations. The project focuses on developing a centralized platform access layer that combines API gateway capabilities, service orchestration, data composition, and fine-grained authorization mechanisms. The platform provides a secure foundation for governance across the ecosystem, supporting complex organizational hierarchies, regional compliance requirements, and consistent policy enforcement.

Requirements

At least 5+ years of experience building distributed systems
Strong expertise in Java development
Experience designing API platforms or API gateways
Solid background in security architecture and system design
Experience with authorization systems (RBAC/ABAC or similar)
Familiarity with cloud-native architectures and scalable, high-availability systems
Understanding of multi-tenant architectures
Experience operating complex distributed systems in production
Strong architectural thinking and problem-solving skills
Upper-Intermediate or higher English proficiency

Nice To Haves

Experience with Identity and Access Management (IAM) systems
Experience building API gateways or service mesh architectures
Work on security-critical or compliance-heavy systems
Knowledge of policy engines (e.g., OPA)
Experience with large-scale enterprise platforms
Familiarity with cloud providers (e.g., GCP)
Experience with data governance, audit, and compliance systems
Background in regulated or high-security environments
Proactive and detail-oriented
Thrives in collaborative environments
Enjoys solving complex integration challenges
Comfortable experimenting with new technologies
Committed to improving data systems

Responsibilities

Design and evolve the platform access architecture for a large-scale distributed ecosystem
Build and maintain a unified API layer over multiple distributed services
Implement fine-grained ABAC authorization at scale, supporting complex hierarchies and relationships
Develop fail-closed security architectures with strict enforcement guarantees
Manage regional compliance, data residency, and routing requirements
Ensure consistent data visibility rules across all products and services
Design high-performance authorization evaluation systems and policy engines
Maintain auditability, traceability, and security transparency mechanisms
Collaborate with platform and product teams on API and access design
Contribute to architectural decisions and security standards