On your question, We welcome Seniors even few hours a week, especially if you are happy to work on architecture and documentation. Plus we are based out of Tenerife if you want to work from an office and there is a lot of surfing on the island.
The common theme of a tech worker looking for options, alternatives and flexibility, but finally answered casually by an employer who seems to "get it", by offering part-time and being located on a neat island?
Other threads are often a pile-ons of complaints from the employee-side, and half-measures and push-backs from the employer-side. So this is neat.