Drupal Developer

The client is looking for an experienced PHP developer proficient in Drupal (preferably v8) to join an existing team. The team has developed a number of content platforms for a large customer and takes care of their complete lifecycle - instance setup, deployment, maintaining and developing modules and services that are used across all platforms etc.
In addition to PHP skills - which are a must-have of course - it would be great if the candidate had experince with frontend/JS development as well.
The freelancer should be able to work 20-30 hours per week for at least a few months, as the client prefers a long-time cooperation. Remote work is partly possible.