A Checklist identifying key tasks, skills, and responsibilities that law firm midlevel startup associates should develop and master to help advance their careers. This Checklist covers the startup-specific tasks, deal and client management skills, and other professional skills, such as time management and business development, that midlevel startup associates should acquire during their fourth through sixth years of practice. Although not exhaustive, this Checklist provides a guidepost for midlevel startup associates at law firms of all sizes and is representative of a general startup practice. It also builds on the tasks, skills, and responsibilities that junior startup associates should develop (see Junior Startup Associate Development Checklist).