Senior Java Engineer for National Tax System Modernization

Introduct Group is an international technology company delivering tailored software solutions and digital products for businesses worldwide. We work on complex, large-scale projects across multiple industries, helping clients turn ideas into reliable, scalable systems.

We are seeking a Middle/Senior Java Engineer to join a large-scale international project focused on modernizing Oman's national tax system.

The project is undergoing a deep technological transformation aimed at moving from a legacy monolithic architecture to a modular, service-oriented system built on modern enterprise principles. The Java Engineer will play a key role in developing the backend platform, driving architectural changes, and introducing new core system components.

The role involves regular business trips to Oman, with on-site work periods of up to one month, combined with remote collaboration within an international team.

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.

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• Fluent English, both spoken and written.

Responsibilities

• 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: support solution design;
• perform code reviews, define and track development tasks, promote and improve engineering best practices within the team.

Nice to have

• Experience using Drools or other rule engines.

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• 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.