Infusing standards and best practices into open source is a challenge. At NASA’s Jet Propulsion Laboratory we created Software Lifecycle Improvement & Modernization (SLIM) to address this challenge. SLIM shares best practices with the broader government-affiliated open-source community and provides actionable templates and guidelines as open source code. This talk highlights SLIM's unique model as well as specific example standards for DevSecOps and "shift left" best practices. Join us to explore merging open-source methods with software standards development.