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 Software Engineer (Full stack with Node.js and React) to join a cross-functional team building a critical platform that supports clinical study setup and management. You will work closely with engineers, UX designers, and global stakeholders to deliver scalable, high-quality solutions. The role requires strong technical ownership, contribution to architectural decisions, and a proactive mindset to drive continuous improvement and innovation across the platform. 

Key Responsibilities 

• Design, develop, and maintain backend-focused full stack solutions for a customer-facing study management platform 

• Contribute to architectural decisions and technical design, ensuring scalability, performance, and maintainability 

• Collaborate closely with frontend engineers, UX designers, and cross-functional stakeholders to deliver high-quality features 

• Build clean, maintainable, and well-structured code with strong focus on quality and best practices 

• Implement and maintain automated testing across unit, component, and end-to-end levels 

• Support secure, scalable solutions, including authentication and identity management integrations 

• Actively contribute to continuous improvement of the platform, engineering practices, and delivery processes 

• Proactively identify opportunities for technical and product improvements and help drive innovation across the team 

Required Experience & Qualifications 

• 5+ years of experience in Full stack software engineering 

• Strong experience designing and building scalable web applications and RESTful APIs 

• Strong backend development experience with Node.js and API development 

• Proficiency in frontend development with TypeScript, React, and Tailwind 

• Experience with API design standards 

• Hands-on experience with MongoDB and NoSQL data modeling 

• Experience with Docker and Kubernetes for containerization and orchestration 

• Solid understanding of software architecture, design patterns, and clean code principles 

• Experience with automated testing, CI/CD pipelines, and modern delivery practices 

• Strong problem-solving skills with attention to detail and quality 

• Proficiency in JavaScript testing 

• Excellent communication and collaboration skills in cross-functional teams 

• Fluent spoken and written English 

A significant advantage would be     

• Familiarity with event-driven architectures and messaging systems like Kafka 

• Experience with enterprise or large-scale distributed systems is an advantage 

• Knowledge of accessibility standards and inclusive design best practices 

• Experience with Agentic coding and AI tools 

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