Symmetry Software

Symmetry Software builds the payroll tax compliance infrastructure on which a substantial share of American payroll runs. Founded in 1984 and operating for more than four decades, the company provides a fully integrated suite of payroll tax APIs and complementary software tools that cover the entire payroll process, enabling other companies to solve tax compliance challenges and build payroll applications of their own. The numbers are considerable: its technology powers the paychecks of over 64 million employees across the United States. The engineering work sits at the intersection of payroll tax calculation, tax compliance, and API design - domains where correctness is not negotiable and where a single miscalculation affects real paychecks. Technical domains span payroll tax software, APIs and integrations, and AI-assisted development. The company uses AI as a co-builder, turning complex problems into durable solutions, and describes a culture of deep customer empathy and a relentless desire to innovate. Symmetry joined Gusto in 2021 while maintaining a commitment to independent innovation. It favours small, empowered teams that move quickly with less overhead, with an emphasis on ownership. Its founder, Tom Reahard, is a self-taught coder, and that sensibility - building rather than buying capability - persists. The company was recognised as Inc.'s 2021 Best Workplace and as one of Phoenix Business Journal's 2024 Best Places to Work. The vision behind the work is straightforward: the paycheck as a foundation for a better life. For engineers, that translates into problems of genuine consequence - tax logic at national scale, delivered through APIs that other product teams depend on.