Examples:
* Used Angular and Rails to build an intranet application used every day at Acme Inc by over 200 people, increasing efficiency at the company by 150%. Features included uploading and sharing documents, with commenting system and email notifications.
* Optimised a Java algorithm in the backend of Foobar Corp's service to increase response time by 200%, delivering business value of $60,000 per year.
Here's my fairly up-to-date CV if you want a complete example: http://dblo.ws/cv You sound like you're a better programmer than me, so you should have plenty of good achievements.