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MAY 2026

Blind by Design

Three levels of OpenFeature with flagd as the provider, in a Java + Spring Boot service. Wire the SDK against a flagd sidecar (Beginner), layer evaluation context to target by cohort (Intermediate), then instrument flag evaluations with OpenTelemetry and roll back a misbehaving fractional rollout (Expert). All without redeploying.

Challenges

Beginner

Stand up the Lab

  • How an OpenFeature client and provider work together: the SDK is provider-agnostic and the flagd provider plugs in via dependency only
  • What remote provider means in practice: the SDK calls a separate flag service (flagd) over gRPC, not parsing flags.json itself
  • What flags.json looks like for flagd (state, variants, defaultVariant)
  • +1 more
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