Job Description 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 Full-Stack Software Engineer

to join a global digital health product environment focused on improving clinical trial experiences for patients, healthcare professionals, and regulators. The ideal candidate is an experienced engineer who can contribute hands-on, quickly understand complex product domains, collaborate effectively with distributed teams, and help maintain high engineering quality in a regulated healthcare technology environment.

Key Responsibilities

• Design, develop, and maintain backend and full-stack solutions in a modern product engineering environment.
• Build and extend backend-for-frontend services and configuration layers.
• Develop and maintain REST APIs and support integration between services and product components.
• Work with database modelling.
• Contribute to microservice-based architecture and event-driven solutions, including technologies such as Kafka.
• Support development, deployment, and maintenance of services running in cloud/containerized environments such as Kubernetes.
• Use AI-assisted engineering tools responsibly as part of the development process, ensuring AI-generated output is reviewed, tested, and owned with the same rigor as hand-written code.

Required Experience & Qualifications

• - 5+ years of experience with Java development and enterprise-level applications -
• Strong programming skills in TypeScript, Java, or similar modern programming languages.
• - Solid experience with backend development and full-stack engineering.
• - Good understanding of microservices architecture and integration patterns.
• - Strong database modelling skills; experience with MongoDB or other document databases is highly valuable.
• - Experience working with complex systems, large codebases, and evolving product environments.
• - Good understanding of automated testing and quality-focused engineering practices.
• - Ability to contribute to technical discussions, code reviews, feature refinement, and solution design.
• - Strong ownership mindset with attention to code quality, maintainability, and long-term product sustainability.

A significant advantage would be

- Hands-on experience with NodeJS, Express, REST APIs, and service-oriented architecture. - Experience with Kafka or other messaging/event-streaming technologies. - Experience with Kubernetes and containerized application environments. - Exposure to AWS or other cloud platforms. ## Additional Information 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 https://www.tieto.com/en/sustainability/diversity-and-inclusion/

Stay alert to recruitment scams

• Tieto only communicates via

@tieto.com

email addresses. • We never ask candidates to pay fees or share financial details during recruitment. • If you receive a suspicious message claiming to be from Tieto, don't respond — verify it via our official careers site. • For more information visit Important Advisory Regarding Recruitment Fraud | Tieto Blog https://careers.tieto.com/blog/2026-5/important-advisory-regarding-recruitment-fraud