Over the last few years, code signing has changed somewhat. With the requirement that private keys be secured, many developers have run into the issues that USB tokens present, or the limitations and costs associated with cloud-based signing solutions. Gone are the days of sharing a PFX file around the dev team or with the CI server (unless you managed to snag a 3-year renewal just before the new requirements were enforced).
Signotaur is a self hosted code signing server (and client) that makes sharing certificates simple, all whilst ensuring the private key never leaves the server.