Constellation Payments

Constellation Payments builds the payment infrastructure that software companies embed directly into their own applications. Founded in 2012 and operated as a division of Constellation Software Inc., the firm serves ISV partners across the United States and Canada, including the wider Constellation Software ecosystem and the Jonas Group of operating companies. Its flagship, the CSIPay Gateway, carries the full payment lifecycle while leaving partners in control of the customer experience.

The technical scope is broad and unforgiving. The work spans payment gateway integration, ISV payment onboarding, PayFac as a Service, point-of-sale terminals, e-commerce payment solutions and the disciplines of PCI DSS compliance and payment security. Engineering problems arise at scale: the platform processes over $3 billion in transaction volume for more than 4,000 merchants, supports over 40 payment methods across both US and Canadian markets, and operates to a 99.9% uptime SLA under PCI DSS Level 1 certification.

The company positions itself as a long-term payment technology partner rather than a vendor, with an emphasis on stable, secure and scalable systems and a partner-centric model. For engineers, the draw is the intersection of regulated financial infrastructure and vertical market software - building systems that sister operating companies come to depend on, in an environment where reliability and correctness are the measurable standard.