When hiring an umbraco development agency  it's essential to look for expertise in Umbraco CMS, customization capabilities, and a track record of successful projects. Consider agencies with strong portfolios showcasing similar projects to yours. Reviews and client testimonials are invaluable in gauging their reliability and quality of service. Look for agencies that offer ongoing support and maintenance post-launch. It's also helpful to discuss timelines, budgets, and communication expectations upfront to ensure a smooth collaboration.