Senior React Native Engineer with Node.js - Tieto Tech Consulting (m/f/d)

Location: Sofia, bg

Job Description

A part of global technology organization Tieto, MentorMate creates durable technical solutions that deliver digital transformation at scale by blending strategic insights and thoughtful design with brilliant engineering. With mature and established practices in enterprise web and mobile development, quality engineering, technical architecture, human-centered design, cloud, DevOps, data, and analytics, the company provides its people with the opportunity to work on impactful, global projects for recognizable brands. 

We are looking to hire a Senior 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. 

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 

• Develop and deliver features for platforms that enable patients to measure, monitor, and track their health status, including integration with medical devices 

• Use modern, agentic coding practices to efficiently develop features and diagnose/debug complex issues 

• 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 

Requirements 

• 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)  

• Experience working with AI-assisted development tools and coding agents (e.g., Claude Code or similar) 

• Strong problem-solving skills with a 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

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 (tietoevry.com)