Senior Full Stack Engineer (React, Node & Nest) - 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 to hire a Senior Full Stack Engineer, who will play a key role in developing scalable web applications and backend-for-frontend services using React, TypeScript, Node.js, and NestJS. Working closely with cross-functional teams, you will help deliver reliable, user-focused healthcare solutions while contributing across the full software development lifecycle. The role combines hands-on engineering, collaboration, and continuous improvement, with strong emphasis on code quality, automated testing, maintainability, and Agile delivery practices. 

Key Responsibilities 

• Develop and enhance frontend functionality for modern healthcare-focused web applications 

• Build and maintain backend-for-frontend services using Node.js and NestJS 

• Collaborate closely with Product Owners, Business Analysts, designers, QA engineers, and developers to deliver high-quality features 

• Participate in feature refinement, technical discussions, sprint planning, and Agile ceremonies 

• Contribute to building scalable, maintainable, and well-tested solutions following engineering best practices 

• Write and maintain unit and automated tests to ensure product quality and reliability 

• Investigate and resolve application issues in collaboration with support and QA teams 

• Support continuous improvement initiatives across development processes, tooling, and team collaboration 

Required Experience & Qualifications 

• 5+ years of professional software development experience 

• Strong experience building modern web applications using React and TypeScript 

• Solid backend development experience with Node.js and NestJS 

• Experience working in large-scale frontend projects and distributed development teams 

• Strong understanding of modern frontend architecture and component-based development 

• Hands-on experience with automated testing frameworks such as Vitest, Jest, Cypress, or Playwright 

• Experience applying Test-Driven Development (TDD) and writing maintainable, well-tested code 

• Proficiency with Git and collaborative development workflows 

• Experience with styling solutions such as Tailwind CSS, Styled Components, or Emotion 

• Understanding of software engineering best practices, code quality, and maintainability 

• Strong communication skills and fluent English 

A significant advantage would be    

• Experience with UI component libraries such as Material UI 

• Familiarity with messaging and event-streaming platforms such as Kafka 

• Understanding of Web Accessibility standards and best practices 

• Exposure to CI/CD workflows and tools such as GitHub Actions 

• Experience collaborating with designers using tools like Figma 

• Familiarity with design systems and reusable component libraries 

• Experience working in healthcare, regulated, or enterprise environments is considered an advantage 

• Familiarity with Agentic coding practices and AI-assisted development 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