> Markdown version of [/jobs/ext/1468488-senior-frontend-developer-45-000-55-000-a-year](https://www.wearedevelopers.com/jobs/ext/1468488-senior-frontend-developer-45-000-55-000-a-year). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Frontend Developer - €45.000 - €55.000 A Year - **Company:** Wasmer - **Location:** Madrid, Spain - **Salary:** €45,000.0 - €55,000.0 - **Contract:** Permanent contract - **Skills:** Java (Programming Language), JavaScript (Programming Language), Computing Platforms, C++ (Programming Language), Cascading Style Sheets (CSS), Cloud Computing, Software Quality, Software Design Patterns, Model View ViewModel, Node.Js, Open Source Technology, Software Architecture, Next.js, Software Engineering, TypeScript, Rust (Programming Language), Tailwind, ReactJS, Information Technology, Codebase, Graphql, Front End Software Development, Multiaccess Edge Computing, Golang - **Published:** July 28, 2026 - **Apply:** https://www.buscojobs.com.es/senior-frontend-developer-%E2%82%AC-45-000-%E2%82%AC-55-000-a-year-en-madrid-ID-364782614 ## About the Role About The Role We are seeking a skilled frontend developer with industrial-strength software engineering skills to help us build the Wasmer website., What You Will Do Develop efficient and reusable UI components within our Design System Consistently deliver high-quality code Facilitate discussions that encourage a healthy conversation about technology Identify and resolve performance and scalability issues Push the needle forward for the team to increase code quality, code maintainability, and team productivity. What You Need Proficiency in JavaScript, TypeScript, React, NextJS, GraphQL, Relay, Tailwind, CSS Modules Strong communication skills (ENGLISH) Teamwork skills Experience interacting with technical customers and customer engineering teams A positive and respectful attitude. Strong computer science fundamentals and good knowledge of various design patterns such as MVVM, MVP, etc. Your Qualifications 5+ years of professional development experience Demonstrated ability to dive into and work with large codebases Strong abstraction, algorithmic, and software architecture skills BS/MS in Computer Science (nice to have) Why Join Us? You want to work for a start-up focused on solving real problems with an open-source community-first approach for building a business. ## Description About The Role We are seeking a skilled frontend developer with industrial-strength software engineering skills to help us build the Wasmer website.About Us At Wasmer, we work on the software that will power the next generation of computing platforms for local, cloud, and edge applications using WebAssembly.Similar to how Node.Js enables server-side JavaScript, we enable server-side WebAssembly for all supported languages like C/C++, Java, Go, Rust, and many others.Our mission is to make software universally available.We are committed to the open-source community and strive to contribute to developers and companies worldwide to help make Wasmer and WebAssembly a universal standard.About You You are a highly technical and accomplished frontend developer and want to work on the software that will power the next generation of Cloud and Edge Computing platforms using WebAssembly.What You Will Do Develop efficient and reusable UI components within our Design System Consistently deliver high-quality code Facilitate discussions that encourage a healthy conversation about technology Identify and resolve performance and scalability issues Push the needle forward for the team to increase code quality, code maintainability, and team productivity.What You Need Proficiency in JavaScript, TypeScript, React, NextJS, GraphQL, Relay, Tailwind, CSS Modules Strong communication skills (ENGLISH) Teamwork skills Experience interacting with technical customers and customer engineering teams A positive and respectful attitude.Strong computer science fundamentals and good knowledge of various design patterns such as MVVM, MVP, etc.Your Qualifications 5+ years of professional development experience Demonstrated ability to dive into and work with large codebases Strong abstraction, algorithmic, and software architecture skills BS/MS in Computer Science (nice to have) Why Join Us?You want to work for a start-up focused on solving real problems with an open-source community-first approach for building a business.Benefits Competitive salary (45K - 55K €) + Equity Employee contract ("contrato indefinido") Hybrid work policy (4 days onsite, 1 day remote) per week Vacation policy : 23 days / year + Extra remote-work days: 10 days / year Monthly fitness stipend Monthly support for open-source contributions ## Related Videos - [Watch Tests Go Brrrr! : Getting Started with Cypress in ReactJS](https://www.wearedevelopers.com/videos/282-watch-tests-go-brrrr-getting-started-with-cypress-in-reactjs) - [Putting the Graph In GraphQL With The Neo4j GraphQL Library](https://www.wearedevelopers.com/videos/257-putting-the-graph-in-graphql-with-the-neo4j-graphql-library) - [Go with the Flow: Stop the Leaks Before Your Memory's a Waterfall!](https://www.wearedevelopers.com/videos/100073-go-with-the-flow-stop-the-leaks-before-your-memory-s-a-waterfall) - [Web development best practices in 2021](https://www.wearedevelopers.com/videos/280-web-development-best-practices-in-2021) - [GraphQL + Apollo + Next.js: A Lovely Trio](https://www.wearedevelopers.com/videos/311-graphql-apollo-next-js-a-lovely-trio) - [But, you're not Facebook](https://www.wearedevelopers.com/videos/378-but-you-re-not-facebook) ## Related Articles - [Frontend Developer Salary in Germany [2023]](https://www.wearedevelopers.com/magazine/195-frontend-developer-salary-in-germany-2023) - [Fully Remote Software Engineer Jobs](https://www.wearedevelopers.com/magazine/447-fully-remote-software-engineer-jobs) - [Frontend Developer Salary in The UK](https://www.wearedevelopers.com/magazine/233-frontend-developer-salary-in-the-uk) - [The Best 7 Frontend Frameworks for Developers in 2025](https://www.wearedevelopers.com/magazine/400-the-best-7-frontend-frameworks-for-developers-in-2025) - [Find a Developer Job: 12 Best Job Sites For Developers](https://www.wearedevelopers.com/magazine/165-find-a-developer-job-12-best-job-sites-for-developers) - [Top-Paying Tech Jobs (with Salaries)](https://www.wearedevelopers.com/magazine/372-top-paying-tech-jobs-with-salaries)