Senior Java Developer - Tieto Tech Consulting (m/f/d)

Tieto Tech Consulting (MentorMate from 2001 to 2026) provides design-led, data-centric, and AI-powered digital engineering & consulting services to enterprises worldwide. With a strong heritage of Nordic quality, local presence, and global-scale operations, we are backed by 8,500+ IT professionals. Our clients trust us for advanced data and analytics skills, top industry-specific expertise, specialized software R&D, and the capabilities of a multinational team. We are part of Tieto, a leading technology company with an annual revenue of approximately EUR 2bn. Tieto Tech Consulting’s team in Bulgaria consists of 500+ professionals specializing in the development of tailored digital solutions in diverse industries We are looking for a Senior Java Developer to join a strategic client engagement focused on enhancing and evolving a large-scale veterinary practice management platform used in an international healthcare-related environment. In this role, you will work on a mature and business-critical product, helping improve development velocity, modernize parts of the platform, and contribute to the delivery of high-quality software solutions. You will collaborate closely with cross-functional teams in an international setup and take part in shaping technical solutions in a complex legacy-to-modernization landscape. Key Responsibilities Design, develop, and maintain backend and full-stack solutions using Java Work with both legacy and modern architecture in a complex, evolving product environment Contribute to frontend development where needed, especially in React Support integration between modern components and legacy technologies such as GWT Participate in technical analysis, code reviews, and solution discussions Write and maintain automated tests to ensure quality and reliability Collaborate with architects, developers, QA engineers, and other stakeholders across distributed teams Contribute to continuous improvement, knowledge sharing, and long-term product sustainability Required Experience & Qualifications Strong professional experience with Java development and enterprise-level applications Experience working with complex systems, large codebases, and both synchronous and asynchronous architecture Hands-on experience with React and modern frontend development practices Familiarity with legacy system integration, ideally including GWT Experience with SQL Server or other relational databases Exposure to Azure and cloud-based environments Good understanding of automated testing and quality-focused engineering practices Strong ownership mindset with attention to code quality and maintainability Ability to work independently, adapt to changing priorities, and onboard quickly into complex domains Collaborative mindset with strong communication skills and fluent English Long-term attitude and commitment to stable team collaboration A significant advantage would be Experience with event sourcing Knowledge of Terraform or other Infrastructure as Code tools Familiarity with CI/CD and DevOps practices Experience working in a staff augmentation or client-facing delivery model Openness to using AI-assisted development tools in a secure and responsible way At Tieto, we believe in the power of diversity, equity, and inclusion. We encourage applicants of all backgrounds, genders (m/f/d), and walks of life to join our team, as we believe that this fosters an inspiring workplace and fuels innovation. Our commitment to openness, trust, and diversity is at the heart of our mission to create digital futures that benefit businesses, societies, and humanity. Diversity, equity and inclusion | Sustainability | Tieto