What are the differences between a lead developer and a senior developer?

The positions of lead developer and senior developer have similar technical abilities. They should both have mastered many technologies and development tools and be able to adapt to project modifications. However, for companies that have both positions, the lead developer is in charge of the development team which includes senior developers. As the lead, you handle some client interaction and work closely with and manage junior team members to mentor them and help them improve their skills. A senior developer does not work directly with the client, does not spend significant time mentoring, and focuses mainly on their part of projects, which is often a substantial piece.