Efficient Employment Solutions for Greenwood Village Businesses. TIME-SAVING TECHNOLOGY, PAYROLL, HR, BENEFITS, COMPLIANCE, SAFETY INSURANCE. Our offerings include HR Management, Employee Benefits, Cyber Security, and Payroll Processing to streamline operations for Greenwood Village businesses. With Risk Management, Safety Compliance, and Workers' Compensation Services, we help protect your business and employees. ESI is a Denver Colorado PEO company and a Colorado Payroll Service.