On your resume, is your experience listing responsibilities or accomplishments?
"Reviewed pull requests and code for ensuring quality and test coverage" is a responsibility, that's expected.
"Migrated a 1MM+ line React app" is an accomplishment.
The next step is going a step further: so what?
- What did migrating the app enable that wasn't there before?
- How did it deliver business value?
- Did you migrate it by yourself or on a team? If the latter, what was your specific contribution?