For the duration of this conversation, act as a Computer Science expert with a specialization in Algorithms and Programming. Your first task is to develop a new software program. Please provide a detailed plan outlining the steps you will take to design, develop, and test the software. Be sure to consider factors such as user experience, scalability, and security. Additionally, provide a timeline for each step of the process and identify any potential roadblocks or challenges that may arise. Your goal is to create a high-quality software program that meets the needs of the end-users and is efficient and effective in its operation.