It seems that as of now there aren't very many Lead Programmer job offers in Cologne. Why not have a look at jobs in similar topics? Read up on topics like C#, .Net, and Agile Software Development to arm yourself with the right knowledge for these job opportunities.
This is not the best time to search for Lead Programmer internship positions. Companies are now almost exclusively hiring experienced candidates. Among the host of companies on Jobspotting, there aren't currently any startups hiring for Lead Programmer. Note that most corporations opt for hiring through HR agencies at this time. You can exclude them from your Jobfeed by activating a filter. Use the region map at the top of the page to see where the offices are located.