Guidehouse is seeking Integration Testers, Performance Testers, and Functional Testers to join our Software Development & Support team. The roles involve designing, developing, and executing test plans, cases, and scripts for various software applications and systems. Testers will collaborate with developers, business analysts, and other QA team members to ensure compliance with quality standards and best practices. The positions require US Citizenship and pre-existing IRS clearance, with a work schedule supporting the eastern time zone. The roles may involve working from Guidehouse or IRS offices if within commuting distance.