{"id":110323,"date":"2026-07-07T12:09:11","date_gmt":"2026-07-07T06:39:11","guid":{"rendered":"https:\/\/vwo.com\/blog\/?p=110323"},"modified":"2026-07-07T12:09:17","modified_gmt":"2026-07-07T06:39:17","slug":"feature-flag-best-practices","status":"publish","type":"post","link":"https:\/\/vwo.com\/blog\/feature-flag-best-practices\/","title":{"rendered":"8 Feature Flag Best Practices for Product and Engineering Teams"},"content":{"rendered":"\n

Most teams use feature flags as a one-way door. This involves shipping the feature, flipping the switch to turn the feature flag<\/a> on or off, and ensuring that nothing crashes. <\/p>\n\n\n\n

If the feature works, the flag remains in place indefinitely, and if it doesn’t, it is deleted. Either way, nobody asks whether the feature actually helped. That’s the baseline, and a lot of teams never go past it.<\/p>\n\n\n\n

The gap between using flags and using them well is bigger than most teams realize. Used well, flags give you control over who sees what and when, the ability to roll back in seconds, and a system for testing decisions before committing to them. <\/p>\n\n\n\n

The practices below cover the full flag lifecycle, which is from creation to cleanup.<\/p>\n\n\n\n

\"Feature<\/figure>\n\n\n

8 best practices of feature flagging <\/h2>\n\n

1. Separate your flag types from day one<\/h3>\n\n\n

When creating a flag, decide upfront whether it is temporary or permanent. For most companies, temporary flags get left in the codebase long after the rollout ends. Nobody removes them because nobody owns them. Over time, you end up with dead conditionals and flags that still get evaluated but serve no purpose.<\/p>\n\n\n\n

A temporary flag has a job and an end date, and you use it to roll out a new feature, run an experiment, or test a change. Once it’s done, it comes out of the code. A permanent flag sticks around because it needs to, like access control for premium features or region-specific compliance settings.<\/p>\n\n\n\n

Fix this at creation and name temporary flags to signal their intent. For example, checkout_v2_rollout<\/em> communicates the temporary nature more than new_checkout<\/em>. Add a description that includes why the flag exists and when it should go. Also, set a removal date at creation and assign an owner. The context is the difference between a clean codebase six months from now and a cleanup project nobody wants to own.<\/p>\n\n\n

2. Define rollback conditions before you deploy<\/h3>\n\n\n

Most teams write their rollback criteria after something breaks. By then, you’re already in incident mode, decisions are made under pressure, and the criteria end up being “turn it off and figure it out later.” That’s not a plan but a reaction.<\/p>\n\n\n\n

It is better to write your stop conditions before you hit deploy, when you can think clearly. A good stop condition is specific. For example,<\/p>\n\n\n\n