Senior Full Stack Engineer - Core UX

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Full Stack Engineer - Core UX based in Spain. This remote role offers the opportunity to improve the everyday experience of users working with sophisticated, business-critical software. As part of a Core UX-focused engineering team, you will refine existing functionality, strengthen consistency, and deliver polished, high-performing interfaces. You will combine strong frontend expertise with full-stack engineering skills to solve challenging product and technical problems. Working alongside full-stack, data, ML, and DevOps engineers, you will contribute to scalable solutions within a highly collaborative global environment. The role provides substantial ownership, with individual contributions directly influencing both product quality and business outcomes. It is particularly suited to an engineer who enjoys iterative improvement, experimentation, and delivering a premium user experience.