If you need to issue lots of X.509 certificates fast to support your development environment, use Venafi's Firefly.
Firefly is a high performing, lightweight micro-service for issuing machine identities quickly and with no dependencies. Firefly fits well within globally distributed application architectures, and provides high-speed/high-volume certificate issuance capacity with enterprise trust and policy enforcement.
Firefly is managed by TLS Protect Cloud and is part of the Venafi Control Plane. If you're new, we recommend starting with our Firefly Path to Success.