Are you looking for the next challenge in your career? Would you like to be part of an exciting highly qualified team of professionals in an international environment? We are currently looking for a qualified Senior ReactJS Developer. Join our international division and work with some of the most talented engineers and technicians from all over the world. Your benefits: Competitive Salary. Long-term secure contract. International Project with top technologies Possibility of working remotely with a flexible schedule. Integration in a highly qualified team of professionals. Travel abroad with your project. Specialized training and continuous professional development. Social benefits and flexible compensation plan. Responsibilities: Development of front-end website architecture. Design of user interactions on web pages. Development of back-end website applications. Implement core business logic. Creation of servers and databases for functionality. Understanding and implementation of security and data protection. Cross-platform optimisation. Design responsive applications. Design and develop APIs. Participating in the design and creation of scalable software. Taking lead on projects, as needed. Maintenance of code integrity and organisation. Writing clean, functional code on the front- and back-end. Compile and analyse data, processes, and codes to troubleshoot problems and identify areas for improvement. Testing and fixing bugs or other coding issues. Meet both technical and consumer needs. Write technical documentation. Requirements: Proficiency with fundamental front-end languages such as ReactJS, TypeScript, Experience en Jest, EsLint Proficeincy with Jira, Linux, Gitlab. Proficiency with fundamental Back-end languages such as Python, Dockers. 5 years experience in Full-stack Location: 100% in Madrid Office. We positively value all work or study experience abroad. All positions require a high level of English (at least B2) - please send your detailed CV in English.