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Product Research·6 min read·June 19, 2026

Prompt Engineering at Scale: Version Control, A/B Testing, and Rollbacks

How Legenyx manages 50+ prompt templates across multiple agents with versioning, performance scoring, and automated rollback.

Austin Kalaydjian
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Prompt Engineering at Scale: Version Control, A/B Testing, and Rollbacks

Prompts Are Code

A prompt is not a one-off string. It's a software artifact that affects user experience, agent behavior, and business outcomes. It deserves version control.

Our Prompt Management System

  • Templates: Structured prompts with variable interpolation
  • Versioning: Every change tracked with changelog and usage statistics
  • A/B Testing: Multiple prompt variants running simultaneously with performance comparison
  • Rollbacks: Instant reversion to previous versions when a variant underperforms

Real Example

We A/B tested two system prompts for the Sales Agent. Variant A (formal, detailed) converted at 4.2%. Variant B (conversational, concise) converted at 7.1%. The system automatically promoted Variant B and deprecated Variant A — no code deploy required.

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