What we do
Software built around your business.
Product design and engineering for custom workflows, data, requirements, and ideas that standard tools can't handle.
See what we do
Square Mill designs, builds, and evolves custom software for organizations with complex problems to solve.
Tell us what you're buildingSelected collaborations
Useful software. Since 2010.
We design and build custom software for solving complex problems. Our work is informed by experience in healthcare, financial technology, venture capital, consumer products, news media, education, the nonprofit arts, and beyond.
Where we've been
Deep roots. A wider field.
Decades in healthcare and financial technology, with work across education, culture, public leadership, and accessibility and security compliance.
See our experienceHow it works
Close to the work. Built together.
The people shaping the product stay involved from the first decisions through launch and whatever comes next.
How we work