We'll need a software engineer or someone (= a person with skill of or like the stated type) on the project team.Note: Someone is not usually used in negatives and questions.
Thesaurus: synonyms and related words
Someone, somebody, something, somewhereSomeone, somebody, something, somewhere are indefinite pronouns. They function in a similar way to some. We use them in affirmative clauses and in questions expecting a particular answer. We can use them to refer to both general and specific people or things. We use them with a singular verb: …