Yes, for our mobile app we implemented feature flags to avoid the problem of having large branches that could not be merged until they were ready for production

Yes, for our mobile app we implemented feature flags to avoid the problem of having large branches that could not be merged until they were ready for production. We used a simple approach without any extra tools: the feature flags were constants that controlled whether certain code blocks were active in dev, test, or prod environments. This enabled us to merge and test work in progress branches regularly before they shipped in the production app. It also made code reviews more frequent and easier.