Contract

• Input: features to control, rollout requirements, environments.
• Output: flag lifecycle + targeting rules + inventory.
• Side effects: none (design only; execution requires flag platform).
• Dependencies: feature flag platform (LaunchDarkly / Split / Unleash / Flagsmith / in-house).
• Stop condition: lifecycle and targeting rules documented.
• Risk: medium — flag mishandling can expose unready features or cause outages.
• Boundary: designs flag system; does not deploy flags unless explicitly instructed.

Feature Flag System Design

Design a feature flag system — rollouts, targeting, kill switches — with lifecycle management and operational runbooks.

Process