Our Customer is a Sweden-based AdTech company specializing in advanced self-serve advertising platforms that automate direct transactions between advertisers and major global publishers. Their technology removes traditional friction in ad sales by enabling automation, transparency, and operational efficiency at scale. Platforms are trusted by internationally recognized publishers including TripAdvisor, Bloomberg, The Washington Post, Opera, and Dow Jones, handling millions of transactions worldwide. The project is a strategic architectural transformation toward a Platform-First approach. The company is transitioning from monolithic, client-specific implementations to a standardized, API-driven, multi-tenant ecosystem of reusable microservices. These services power the entire product suite, remaining independent, scalable, and decoupled from frontend or customer-specific customization.
Senior Java Developer
Location
Europe
Posted
3 days ago
Salary
0
Seniority
Senior
Job Description
Senior Java Developer
Sigma Software
Role Description Are you passionate about building secure, high-performance platforms? 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. Why join us? 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 integrates: - API gateway capabilities - Service orchestration - Data composition - Fine-grained Attribute-Based Access Control (ABAC) This system will serve as the foundation for security and governance across the entire ecosystem, supporting complex organizational hierarchies, regional compliance, and strict enforcement guarantees. Job 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 Qualifications - 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 Requirements - 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 Benefits - Proactive and detail-oriented - Thrives in collaborative environments - Enjoys solving complex integration challenges - Comfortable experimenting with new technologies - Committed to improving data systems
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