Senior Java Engineer - National Tax System Modernization

About the Role

We are seeking a Senior Java Engineer to join our team for a significant project focused on modernizing Oman's national tax system. This Senior Java Engineer remote position involves working on a large-scale international project that aims to transform a legacy monolithic architecture into a modern, modular, service-oriented system.

What You'll Do

• Participate in the architectural transformation and evolution of the backend platform.
• Develop and refactor REST APIs and backend services using Java and Spring.
• Contribute to the modernization of core system components (BPM, IAM, business rules).
• Optimize backend performance and background processing.
• Participate in CI/CD processes and automated deployments.
• Collaborate with frontend, DevOps, QA teams, and client representatives.
• Provide technical leadership and mentorship to junior developers, supporting solution design and performing code reviews.

Requirements

• 3+ years of commercial experience in Java development.
• Strong knowledge of the Spring Framework (Spring Boot, REST).
• Experience designing and developing REST APIs.
• Experience working with relational databases.
• Understanding of modular and service-oriented architecture (SOA) principles.
• Experience working with legacy codebases and participating in architectural changes.
• Experience writing unit tests and understanding TDD principles.
• Solid experience with Maven.
• Fluent English, both spoken and written.

Nice to Have

• Experience using Drools or other rule engines.
• Experience integrating Keycloak or other IAM solutions.
• Experience working with Liquibase.
• Knowledge of Quartz or other job scheduling frameworks.
• Experience working on large-scale enterprise or government projects.

What We Offer

• Participation in a large-scale, national-level government project.
• Business trips to Oman (up to one month) for on-site collaboration with the client and project team.
• Long-term project with stable collaboration.
• Accommodation provided.
• Transportation cost compensation.
• Relocation and onboarding support.
• Opportunity to directly influence system architecture and key technical decisions.
• Work within an international team and a professional engineering environment.
• Modern enterprise technology stack and technically challenging tasks.