Hiring Undergraduate Laboratory Assistants:
When recruiting for an undergraduate student lab assistant, please consider posting your job as a Work Study position for students who have qualified for a work-related portion of their financial aid package.
Work Study is subsidized by both Federal and State programs, so depending on the students’ eligibility, the will receive the normal student pay rate, but your budget will only have to cover a lower percentage of this (typically 60 to 70%) during the school year. During the summer, lab budgets would be charged the full rate, unless the student is also eligible for summer Work Study (a bit more unusual).

Labs seeking a Work Study student can post a job advertisement here: https://www.washington.edu/workstudy/on-campus-employer-guide/
Please check with the HR manager about current hourly rates, as these change annually.

Students with Work Study eligibility can search for jobs here:
https://www.washington.edu/workstudy/find-a-job/

Handshake is the UW Student Employment Job Board (It replaced Husky Jobs.) Labs can post jobs here (whether non-Work Study or additional advertising for Work Study positions listed at Work Study job board). And any student can search for student jobs and internships here. If you are a lab manager or PI wanting to post, please reach out to the HR manager for more information on accessing the GS employer page.
https://careers.uw.edu/resources/handshake/

Other avenues for recruiting undergraduates:
Sometimes someone from a lab will make announcements at a relevant undergraduate course, or post flyers in relevant departments. You are also welcome to share any job postings on your lab website, or through social media.

UW Diversity Hiring Toolkit
UW HR has prepared a toolkit for recruiting, hiring, and retaining diverse staff. While this is mainly focused on professional and classified positions, the general principles can be useful for any category of employees.
https://www.washington.edu/diversity/staffdiv/hiring-toolkit/

NIH Toolkit for Scientific Workforce Diversity:
https://diversity.nih.gov/ (Click the SWD interactive toolkit link on the right.)