What responsibilities and duties are usually assigned to a senior developer?

A senior developer is typically responsible for:

• Architecture and system design, making key technical decisions.
• Leading the team: mentoring, code reviews, assisting in solving complex problems.
• Ensuring code quality and adherence to development standards.
• Planning and estimating tasks, interacting with managers and other departments.
• Optimizing development processes and implementing best practices.

Example: a senior developer might suggest refactoring a module to improve performance and maintainability, as well as help junior colleagues understand a new framework.