Descripción de la oferta
Role: Senior Frontend Developer (Contract)Rate: Up to €300 - €400/dayStart: ASAPDuration: Open-endedEnvíe su CV y cualquier información adicional requerida después de haber leído esta descripción, haciendo clic en el botón de solicitud.OverviewWe're hiring a Senior Frontend Developer to deliver high-performance, conversion-focused web experiences across customer-facing platforms and internal tools. This is a hands-on contract role with immediate impact, suited to someone who thrives in fast-paced, product-led environments.You'll work closely with Product, Marketing, and Design to build interfaces that are not only technically strong, but also optimised for user engagement and performance.ResponsibilitiesBuild modern, high-converting user interfaces with strong attention to UX and performanceDevelop and maintain frontend code for public websites and internal toolsEnsure full responsiveness and cross-browser compatibilityIntegrate frontend components into PHP environments using Twig or similar templating systemsExecute A B testing implementations and optimise based on performance dataConduct thorough browser and device testing to ensure reliabilityCollaborate with Product, Marketing, Design, QA, and OperationsMaintain code quality through reviews and best practicesTake ownership of features from development through to productionRequirements5+ years frontend development experience in production environmentsStrong HTML5, CSS3, and JavaScript (ES6+) fundamentalsSolid experience with jQuery and working in PHP-based environmentsExperience with Twig or similar templating enginesStrong CSS architecture knowledge, including BEM and SASSExperience with NPM, Yarn, or similar toolingProven ability xcskxlj to build from scratch, not purely framework-drivenExperience with A B testing and performance optimisationStrong debugging and cross-browser testing skillsExperience working independently with high ownershipHands-on use of AI tools and ability to implement AI-driven features or agentsConversational Spanish and intermediate EnglishNice to haveReact and or TypeScript exposureExperience mentoring or supporting junior developersInvolvement in architecture or technical decision-making
