Software Improvement Group (SIG) is a software quality assurance company founded in 2000 that specializes in source code analysis and software engineering consulting. The company operates its Sigrid software assurance platform, which analyzes source code against a benchmark database to provide insights on software quality, security vulnerabilities, and technical debt. SIG serves over 400 clients across various industries including financial services, transportation, and telecommunications.

The company's approach combines automated source code analysis with consulting services delivered by IT experts. Their platform evaluates software portfolios, including both traditional and AI-driven applications, to help organizations understand their current software state, identify risks, and develop modernization strategies. SIG maintains offices across Europe and the United States.

The company's services include software quality benchmarking using certified models, landscape scanning for application portfolios, consulting for complex IT challenges, and training programs through SIG Academy. Their work focuses on helping organizations manage legacy systems, reduce maintenance costs, address security vulnerabilities, and improve software maintainability. SIG's research and development team conducts work in areas such as Green IT, AI, and open-source software quality.