redirect all traffic to https, except one page, and ensure that page is served on http

.htaccess

# Force HTTPS
  RewriteCond %{HTTPS} off
  RewriteCond %{REQUEST_URI} !^/who-we-are/careers$ [NC]
  RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

  # Ensure that Careers page is not forced over HTTPS
  RewriteCond %{HTTPS} on
  RewriteCond %{REQUEST_URI} ^/who-we-are/careers$ [NC]
  RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Works great! 👍