Senior Full Stack Developer (Node.Js & React)

Are you a versatile engineer who thrives at the intersection of robust backend architecture and seamless frontend user experiences? We are looking for aSenior Full-Stack Engineer (Node.Js & React)to join a high-caliber team building scalable, greenfield platforms from the ground up. This is a unique opportunity to own end-to-end feature development, tackle high-load data challenges, and directly influence the trajectory of a cutting-edge product.About the ClientOur partner is an elite tech company building product engineering across Fintech, i Gaming, and Marketing. They turn innovative ideas into high-performing engines and launch them at scale. As their exclusive recruitment partner, Lionhires manages their full-cycle talent acquisition.What You Will DoArchitect and Build:Drive the end-to-end development of an in-house platform, taking new features from initial concept to deployment.Scale & Optimize:Design high-performing microservices capable of handling heavy traffic, utilizing Rabbit MQ and Redis for optimal message queuing and caching.Integrate Systems:Seamlessly connect complex, third-party APIs with our proprietary Fintech solutions.Ensure Quality:Write clean, maintainable, and test-driven (TDD) code in Type Script across both Nest JS and Next JS llaborate Efficiently:Participate actively in an Agile/Scrum environment, contributing to bi-weekly sprints, grooming sessions, and strategic planning.What You BringDeep Web Expertise:5+ years of commercial web development experience, with a proven track record of delivering production-grade applications.Full-Stack Mastery:3+ years of dedicated, commercial experience with bothNode.JsandReact.Modern Tech Stack:Hands-on experience with Type Script, Next JS, Nest JS, Apollo, and Material UI.Data & Architecture:Strong proficiency with REST, Graph QL, Web Sockets, and managing high-load SQL/No SQL databases (specifically My SQL and Mongo DB).Engineering Best Practices:A solid understanding of microservice architecture, TDD principles, and Git version munication:Upper-intermediate to fluent English communication skills (written and spoken).Bonus Points For2+ years of hands-on experience with CI/CD pipelines, Docker, and Kubernetes.Deep familiarity with various queue brokers (Rabbit MQ, Apache Kafka, etc.).What's in It for YouCompetitive Compensation:An attractive salary package with structured annual reviews to reward your growth.Seamless Relocation:A comprehensive relocation package covering your flights and a 2-week hotel stay to get you settled.Legal Peace of Mind:Official EU/Spain employment contract, including sponsorship and registration support for your family members.Work-Life Balance:23 working days of annual vacation to ensure you stay refreshed and ntinuous Growth:Dedicated budget for professional learning, development opportunities, and partial compensation for language classes.Vibrant Culture:Team-building activities, birthday gifts, and access to an upcoming Social Club featuring over 50 events per year.