Singular vs. Plural in Item Counts

While working as an engineer, I occasionally applied my problem-solving skills to software problems. For example, I noticed that numbers in increasing filenames did not always increase. I tinkered with solutions and subsequently wrote an article that was published in Dr. Dobb’s Journal.

After that job fizzled, I switched to programming full time and have applied my programming skills to multimedia education, web-based games of skill, legal-compliance and ethics-training courses, a portable PET scanner, and shareware programs.