This job posting is seeking a junior/mid-level user experience designer to work for a leading technology company providing designs for online and mobile experiences. The role involves collaborating across teams to understand capabilities and implement technologies that improve products, communicating with clients to further develop projects, and having examples of design work like wireframes, personas and user journeys. Candidates should have a portfolio demonstrating experience and quality, passion for user-centered design, and ability to discuss projects with senior stakeholders. The position is located in central London with a salary range of £20,000 to £40,000 depending on experience and benefits.