FrontEnd Developer



At Opinno, we help large corporations to transform through innovative methodologies used by start-ups and entrepreneurs. We see innovation as a process that begins by listening to people and ends with the design and prototyping of new products and services that generate an impact on society, being this the foundation of our model: people, ideas and solutions.

In our Solutions division we accelerate problems with technology solutions, covering different projects such as design, digital strategy, development and living labs.

We are looking for a mid senior FrontEnd freelance to join our team in Madrid


  • Designing, building and maintaining efficient, reusable and reliable front-end code;

  • Making decisions related to front-end code architecture and technical approach;

  • Building cross-browser solutions optimized for mobile devices;

  • Translating requirements and mock-ups into fully functioning features using efficient and maintainable code;

  • Performing code review of 3rd party developed front-end code and make recommendation about possible improvements;

  • Participating in the design discussion of new features and changes in the platforms developed;

  • Identifying UI performance bottlenecks, propose and implement solutions;

  • Writing documentation to facilitate collaboration and maintenance;

  • Assisting end user technical questions and troubleshoot issues;

  • Stay abreast of latest trends in front-end development and propose new ideas to enhance usability and performance.


  • High performance and experience in JavaScript  

  • Experience in AngularJS and ReactJS

  • HTML5, CSS3, CSS pre-processors (Sass/Less), JS task runners (Grunt/Gulp), BEM. 

  • Experience in responsive development, and mobile-first applications 

  • Experience working with Agile methodologies




Ready to accept this challenge? Don’t forget to send us your CV!