Charalampos Lymperopoulos has worked on several projects for Siemens Enterprise Communications including the Common Management Portal where he performed business analysis, requirements analysis, use case creation, and prototyping. He also tested and worked on style guides for the Unified Communications Web and Desktop Clients. At VELTI he worked on projects involving interactive screens, proximity marketing, augmented reality, and mobile advertising. He also supported technical documentation, market research, and presales activities. At OTE, he transitioned static content to dynamic, created banners, managed campaigns, and consulted on monetization. For the Greek School Network, he performed hardware installation, quality assurance, and help center work. He researched accessibility