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 Type

Script 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 Type

Script in production environments- Strong understanding of modern Java

Script, 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

📌 Frontend Developer - €300 - €350 A Day - Remote (Álava)
🏢 Appcast, La Fosse
📍 Álava