When most people write a resume, they concentrate on their 'features'. This is ineffective marketing. People don't buy features, they buy benefits. I don't want a drill, I want a hole!
So, craft your resume - and your attitude - to show how your skills and responsibilities led to a benefit for the client, user, and/or employer, as appropriate.
Bad Example [just feature]: 2009-2010 coded a fubar system in python on linux
Good Example [feature + benefit]: 2009-2010 designed and developed a fubar system in 3 months which reduced order turnaround time by 75% and added $3M to gross revenues in the first six months after deployment, using Python on Linux.