Job Title: Senior Frontend DeveloperLocation: Fully RemoteRate: €300–€350 per day (depending on experience)Contract: Open-endedOverviewWe 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 QARequirements- 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

📌 Frontend Developer (San Cristóbal)
🏢 Appcast, La Fosse
📍 San Cristóbal