Once or Ones what is correct use in this sentence? [closed]

Question

I am sorry for this basic question, I am not an native English that is why poor in language.

Kindly guide and help me about correct use of word (Once / Ones). I want to write I build new software and fix already build. What is correct word to use in the following sentence ?

I am a software developer who has permanent residence, Bachelor degree and 4 years experience for developing new software and doing enhancements in existing once / ones

Thanks for your precious time, guiding and helping me.

Answer 1

In general, ones would be correct here.

However, software cannot normally be a plural noun. You wouldn't talk about many softwares. You might instead refer to many software applications.

Answer 2

"Ones" is the correct word to use.

"... in existing ones" tells of how you are able to enhance "existing software". "Ones" refers to the software that already exist.

"Once" refers to a time. It doesn't refer to a particular thing or object, instead, it's used to refer to a period of time. E.g.:

He once had a dog

In the example, "once" is used to mean that the subject had a dog in a period of time in the past.

Answer 3

ones means "things of the type described earlier".

once means "one time".

That said, "software" is not a countable noun, so you can't really refer to it with "ones". There are also several other minor errors in your existing sentence. Try:

I am a software developer who has permanent residence, a Bachelor's degree and 4 years' experience developing new software and enhancing existing software.