Senior Software Engineer with React Native - Tieto Tech Consulting (m/f/d)

Tieto (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’s team in Bulgaria consists of 500+ professionals specializing in the development of tailored digital solutions in diverse industries.

We are looking to hire aSenior React Native Engineer to join our growing team and contribute to the development of high-quality mobile applications for an AI-based healthcare platform that supports the optimization of clinical trials and improves the patient experience. This role is ideal for someone who thrives in a collaborative environment, enjoys solving complex problems, and is passionate about delivering impactful, meaningful solutions.

This role is based on a hybrid work model, with 3 days per week in our Sofia office.

Key responsibilities

• Architect, develop, and maintain scalable mobile applications using React Native

• Design and implement responsive, user-friendly interfaces with a strong focus on performance, usability, and accessibility

• Collaborate with product, design, and backend teams to deliver end-to-end features aligned with business requirements

• Develop and maintain backend services and REST APIs using Node.js to support mobile functionality

• Implement and manage state using Redux and Redux Toolkit for scalable and predictable data flow

• Apply modern JavaScript (ES6+) and clean architecture principles to build maintainable and reusable codebases

• Optimize application performance, responsiveness, and stability across devices and network conditions

• Ensure code quality through unit testing, code reviews, and adherence to best practices

• Debug and resolve production issues to maintain application reliability

• Stay updated with emerging trends and best practices in React Native and mobile development

• Use agentic coding practices to develop and debug issues.

• Develop features for platforms that allow patients to measure and track their health status and read data from medical devices.

Required experience & qualifications

• 5+ years of professional experience in JavaScript/TypeScript development

• 3+ years of hands-on experience building mobile applications with React Native

• Strong experience with Node.js and developing scalable backend services and RESTful APIs

• Solid understanding of modern JavaScript (ES6+) and TypeScript best practices

• Proven expertise in state management using Redux and Redux Toolkit

• Experience designing, integrating, and consuming RESTful APIs

• Familiarity with CI/CD pipelines and mobile app deployment processes (App Store and Google Play)

• Strong problem-solving skills with keen attention to detail

• Excellent communication and collaboration skills, with the ability to work effectively in cross-functional teams

• Excellent spoken and written English language skills

A significant advantage would be

• Experience integrating Bluetooth technologies (e.g., BLE devices, wearable tech) into mobile applications

• Familiarity with native module development and bridging between React Native and native iOS/Android code

• Knowledge of accessibility standards and inclusive design best practices

• Experience with analytics, crash reporting, and monitoring tools (e.g., Firebase, Sentry)

• Familiarity with Node.js frameworks such as Express or NestJS for building scalable backend services

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

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• 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