Directors of California’s retirement savings program for private sector workers are ironing out details about how the program will invest and who will be managing those investments.

They’re also working out the details of what role employers will play in the pilot program that’s set to launch later this year.

California’s Secure Choice Retirement Savings Board chose the brand name CalSavers at its meeting Jan. 22, but is still working out the nuts and bolts of the program. In late...