Tel.: +351 214 171 161 - LisboaTel.: +351 253 120 734 - BragaFax: +351 214 177 610(Chamada para a rede fixa nacional) (Call to the national fixed network)About Us:Data Smart is a Portuguese company, positioning itself as a consulting company of excellence, with over 20 years of existence. We are specialized in Technologies and Information Systems services, for the Portuguese and International markets. We pride ourselves on fostering a culture of involvement, experience, and excellence.Join our team as aBackend Developer – MERN Stack(Hybrid – Porto)!We are hiring for both Mid-level and Senior profiles.What You'll Do:Design, develop, and maintain backend services using Node.js and Express.js.Build and manage scalable and secure RESTful APIs.Design and optimize Mongo DB data models, ensuring performance and scalability.Contribute to system architecture decisions, focusing on reliability and efficiency.Ensure high standards of code quality, security, and performance.Collaborate with frontend, product, and Dev Ops teams to deliver end-to-end solutions.Participate in code reviews, testing, and continuous improvement processes.Support Agile practices, contributing to Scrum ceremonies and team delivery commitments.Qualifications:3+ years of experience with MERN stack (Mongo DB, Express.js, React, Node.js).Strong experience with Node.js and Express.js for backend development.Solid expertise in Mongo DB, including schema design, aggregation, and performance tuning.Experience designing and maintaining RESTful APIs at scale.Good knowledge of SQL and database performance optimization.Familiarity with Agile/Scrum methodologies.Experience with testing practices, responsive design, or reactive programming is a plus.Strong problem-solving skills and ability to write clean, maintainable code.Team-oriented mindset with strong communication skills.Ability to work effectively in a fast-paced environment.Continuous learning mindset and proactive attitude.Portuguese proficiency at a professional level (minimum B2).Living in Portugal and available to work in a hybrid model.At