Senior Java Developer

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 and scalable systems.

We are expanding our team to join a long-term project focused on the development and maintenance of government information systems. These systems play a critical role in tax and labor compliance and are used daily by employers, government agencies, and inspection bodies.

The work follows an Agile process (two-week sprints) in close coordination with the client's architects and administrators. The project covers both the development of new functionality and the maintenance of existing systems, with strong requirements for code quality, testing, and documentation.

Requirements

• At least 4 years of commercial Java development experience;
• Experience with the Java ecosystem stack: Spring / Spring Boot, Maven and Gradle, Apache Tomcat;
• Strong command of PostgreSQL, with the ability to write and optimize native SQL queries, read and rewrite existing queries, and add indexes; experience with Liquibase for automated database schema management;
• Experience with Keycloak (OpenID Connect) or similar solutions for authentication and authorization;
• Integration development experience: familiarity with WSO2 or comparable integration platforms, and an understanding of how to build cross-system integrations (REST, SOAP, message queues);
• Solid containerization skills (Docker);
• Experience with Git and common practices for code review, branching, and release cycles;
• Familiarity with application-side observability tools: SLF4j + Logback, OpenTelemetry, W3C Trace Context; an understanding of the difference between log levels (Fatal / Error / Warning / Info / Debug / Trace) and which events belong at which level;
• Experience covering code with unit, system, and integration tests;
• Architectural thinking: the ability to take part in designing technical architecture, prepare deployment and component diagrams, and produce them in DrawIO / PlantUML / UML XMI 2.5+;
• Experience writing technical and architectural documentation;
• Teamwork skills: the ability to work in a cross-functional team with analysts, architects, testers, and client representatives;
• A proactive attitude and the ability to take an idea from discussion to a working solution;
• English at a level sufficient for fluent spoken and written communication within the team and with client representatives.

Responsibilities

• Take part in the full development cycle of new functionality: from requirements analysis and design to programming, testing, and deployment;
• Write backend code in Java using Spring / Spring Boot, with deployment on Apache Tomcat;
• Design and refine PostgreSQL schemas, write migrations with Liquibase, and optimize slow queries;
• Develop and maintain integrations with external systems via WSO2;
• Configure authentication and authorization through Keycloak;
• Take part in designing the technical architecture of solutions: prepare high-level designs and deployment and component diagrams, and align decisions with the client's architect;
• Prepare and maintain technical and architectural documentation;
• Maintain existing functionality: analyze incoming reports and fix defects in line with SLA;
• Review colleagues' code, mentor middle developers, and help them grow;
• Take an active part in refining business requirements together with the analyst and the client, and help identify how changes will affect the system.

Nice to have

• Experience with Angular;
• Experience with one of the cloud providers, preferably Microsoft Azure (App Services, Azure Functions, Blob Storage, Application Insights);
• Experience building and maintaining CI/CD pipelines (Azure DevOps, GitHub Actions, Bitbucket Pipelines, or similar);
• Experience with App Dynamics or comparable APM tools;
• Understanding of OWASP Top 10 principles and experience building secure web applications;
• Experience working on government projects or other strictly regulated projects with high requirements for documentation and audit.

Working conditions

• Competitive salary;
• Flexible remote working schedule, with the opportunity to work on high-profile global projects;
• Diverse, multinational team serving clients in over 10 countries;
• Access to an international online office for seamless connectivity and collaboration;
• Optional English classes for language proficiency enhancement;
• Dedicated learning budget for courses and certifications to support professional development;
• Necessary equipment provided for optimal performance (in Ukraine).