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

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