I do not often recommend government programs but today is an exception.
Surety bonds are a third party guarantee of performance and/or payment under a contract between a supplier and a buyer. Most frequently, surety bonds are required by government agencies all over the world when entering into contracts with private sector providers of goods and services. Surety bonds are typically provided by insurance companies although letters of credit from commercial banks can serve the same purpose.
Given that most companies do not routinely sell to government agencies, arranging surety bonds can be a challenge. This SBA webinar may be of interest.