I am interested in a part-time or summer full-time undergraduate research position.

Summer Research Experience for Undergraduates (REU) 
Undergraduates apply to the Harvard SEAS REU Program and indicate interest in several choices among a large number of positions. I usually post a position each year.

Other research opportunities for Harvard College students 
Harvard College undergraduates obtain support for summer or term-time research under the supervision of a faculty member such as myself under any of several programs, including:
Undergraduate Research and Fellowship (URAF) programs 

Research Experience for Course Credit
Of course there are non-job opportunities for guided research for course credit. Many departments offer a course such as Engineering Sciences 91r for students enrolled in Harvard College and I would be happy to discuss such opportunities with you before or at the beginning of the semester.