A mixed-method empirical study of Function-as-a-Service software development in industrial practice.

•The first systematic study of serverless and FaaS cloud offerings.•Combines analysis of grey literature, interviews, and Web-based survey.•FaaS services are commonly used in the backend, although frontend usage is possible.•Adopting serverless requires a different, composition-oriented mindset.•Tooling availability and maturity remain barriers to entry.