AtomicJar, a company behind the open source library Testcontainers, announced that it has secured $25 million in Series A funding and is releasing Testcontainers Cloud as a public beta.

Global software investor Insight Partners led the round, with participation from existing investors boldstart ventures, Tribe Capital, Chalfen Ventures and Snyk co-founder Guy Podjarny and CEO Peter McKay. New investors include Irregular Expressions, a VC fund representing 90+ CTOs and heads of engineering of leading tech companies; software industry veteran Walter Scott; and, the co-founders of Tackle.io.