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Sirainen programmed the Dovecot IMAP Server in 2002, releasing the first version later that year. In 2011, he co-founded Dovecot OY to provide professional support and consultation services for the Dovecot software family. Under his stewardship, Dovecot has grown to over 3.5 million IMAP server installations – a global market share of almost 70%.

Sirainen has worked as a software developer for Directi in India, Rackspace in Virginia, and Portugal Telecom. In 2015, Dovecot merged with Open-Xchange to create one of the largest open-source companies in Europe capable of offering complete, end-to-end software and security solutions for service providers.