Is employeur masculine or feminine?

In context

• L'employeur ne peut pas remplacer les grévistes.

  The employers can't replace the striking workers.

• Tom a vu son ancien employeur à une conférence.

  Tom saw his former employer at a conference.

• Layla a pensé que Sami serait un employeur idéal.

  Layla thought Sami would be an ideal employer.