diff --git a/src/components/reputation/tier.ts b/src/components/reputation/tier.ts
new file mode 100644
index 0000000..3d030e4
--- /dev/null
+++ b/src/components/reputation/tier.ts
@@ -0,0 +1,19 @@
+export interface TierConfig {
+  label: string;
+  badgeClass: string;
+  minScore: number;
+}
+
+export const REPUTATION_TIERS: Record<string, TierConfig> = {
+  DIAMOND: { label: 'Diamond', badgeClass: 'bg-cyan-500/20 text-cyan-300 border-cyan-500/30', minScore: 900 },
+  GOLD: { label: 'Gold', badgeClass: 'bg-amber-500/20 text-amber-300 border-amber-500/30', minScore: 750 },
+  SILVER: { label: 'Silver', badgeClass: 'bg-slate-400/20 text-slate-300 border-slate-400/30', minScore: 600 },
+  BRONZE: { label: 'Bronze', badgeClass: 'bg-amber-700/20 text-amber-400 border-amber-700/30', minScore: 0 }
+};
+
+export function getTierForScore(score: number): TierConfig {
+  if (score >= 900) return REPUTATION_TIERS.DIAMOND;
+  if (score >= 750) return REPUTATION_TIERS.GOLD;
+  if (score >= 600) return REPUTATION_TIERS.SILVER;
+  return REPUTATION_TIERS.BRONZE;
+}
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