**Who are we?** ENVIRA (www.envira.es) is a company with over 30 years of experience, specializing in the development of monitoring solutions for environmental parameters and structural health in industrial, urban, and agricultural environments, as well as in data processing. Today, ENVIRA implements comprehensive automatic systems for measuring environmental quality and pollutant emissions, and also designs and develops devices for IoT networks and software platforms at the forefront of technology, performing precise measurements and analyzing multiple parameters in Industry 4\.0, Smart Cities, and precision agriculture environments. ENVIRA DS is the leading environmental monitoring and control system in the Spanish market, with over a hundred references in both public and industrial sectors. ENVIRA DS is a reference Industrial Internet of Things (IIoT) platform for pollution control and emission calculations, widely implemented in the power generation, chemical, petrochemical, metal, cement manufacturing, and transportation sectors. **What are we looking for?** Are you passionate about technology and the environment? Would you like to join a young and dynamic company working to improve sustainability? This is your opportunity! We are seeking a Senior Fullstack Developer with at least 3 years of experience developing software solutions using Java stack and PWA (Progressive Web Apps) technologies. The selected candidate will join a highly skilled technical team, taking responsibility for participating in the design and selection of scalable and sustainable software architectures while applying best programming practices. **Responsibilities**: * Develop Fullstack applications using Java and React (or other modern frontend technologies). * Actively participate in the design and selection of robust and scalable software architectures. * Design and build software development ecosystems, managing key tools such as: * Version control systems (Git, etc.) * Continuous integration systems (Jenkins, GitLab CI, etc.) * Code quality and reporting tools (SonarQube, etc.) * Dependency managers (Maven, Gradle, etc.) * Process automation (CI/CD pipelines) * Ensure code quality by implementing good programming practices such as SOLID, TDD, and design patterns. * Create and maintain PWA applications, ensuring their performance and reliability. * Collaborate with different teams in an agile environment to build innovative solutions. * Research new technologies and methodologies that add value to the team and projects. **Requirements**: * At least 3 years of experience in Fullstack development, with a focus on Java and web applications. * Solid knowledge of software design and architecture selection. * Experience working with PWA and frontend technologies such as React or similar. * Experience with agile methodologies and collaborative environments. * Experience designing and building software development ecosystems and knowledge of the tools involved. * Experience applying good programming practices, such as SOLID principles, TDD, and design patterns, in real projects. * Higher education degree in Computer Engineering or equivalent. * Experience in agile environments and collaborative methodologies. **What do we offer?** . Join a stable company with a long history in engineering, to develop a strategic product for the company. * Participate in the development of technology with a purpose: advancing towards an environmentally sustainable industry, combating climate change. * Flexible working hours from Monday to Thursday and continuous schedule on Fridays. * Hybrid work model (60% remote). Mondays are dedicated to working on the backlog with the functional team, and Fridays are used to conduct product demos, review progress, and plan the week. * 25 days off: 23 vacation days \+ Christmas Eve and New Year's Eve. * Summer working hours. * Flexible compensation plan. * Various options to customize your work setup: laptop, monitor, dock station... * Training budget. * Salary range 40K\-50K