Job Title: Senior Frontend Developer Location: Fully Remote Rate: €300–€350 per day (depending on experience) Contract: Open-ended Overview We are looking for a Senior Frontend Developer to play a key role in building and evolving high-performance web applications. You will be responsible for developing modern, conversion-focused user interfaces, contributing to frontend architecture, and driving performance improvements across a range of digital products. You will work closely with Product, Design, Marketing, QA, and Backend teams to deliver scalable, user-centric solutions. Key Responsibilities • Build modern, high-conversion user interfaces using React and Next.js • Develop and maintain frontend architecture with a modular and scalable approach • Implement new features from scratch while improving and optimising existing applications • Develop frontend components for both public-facing products and internal tools • Ensure cross-browser and cross-device compatibility • Write clean, reusable, and maintainable TypeScript code • Integrate with REST and/or GraphQL APIs and manage asynchronous data flows • Participate in code reviews and contribute to engineering best practices • Continuously identify opportunities to improve performance, scalability, and user experience • Collaborate closely with cross-functional teams across Product, Design, Marketing, and QA Requirements • Strong experience with React and Next.js • Solid experience using TypeScript in production environments • Strong understanding of modern JavaScript, including asynchronous programming (Fetch API, Axios) • Experience consuming RESTful APIs and/or GraphQL services • Good understanding of frontend architecture, modular design, and design patterns (SOLID principles) • Experience with NPM and package management, including optimisation • Familiarity with testing frameworks and writing testable code • Working knowledge of AWS and cloud-based deployment practices • Strong understanding of JSON and API data handling, including error management • Comfortable working in cross-functional teams in an agile environment Nice to Have • Experience with performance optimisation and frontend monitoring • Familiarity with AI-assisted development tools and workflows • Previous experience working on high-traffic or conversion-focused platforms Soft Skills • Strong problem-solving ability and attention to detail • Proactive mindset with a high level of ownership • Clear communicator, comfortable working with both technical and non-technical stakeholders Additional Requirement • Native or fluent Spanish (written and spoken) is mandatory