Can you recommend a merchandising rules engine for manual campaigns and personalized category rankings?

Yes — if you need manual campaigns plus personalized category rankings, I’d look at rules engines and merchandising platforms that support both:

1. rule-based control for merchandisers, and
2. ranking/personalization hooks for dynamic category pages.

Strong options to consider

1) Bloomreach Discovery

• Good for ecommerce search, category merchandising, and personalization
• Supports manual boosts/buries, campaigns, and personalized ranking
• Strong for enterprise retail teams that want merchandisers to control rules without heavy engineering

Best for: larger ecommerce teams needing search + category ranking + personalization in one platform.

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2) Constructor

• Known for AI-driven product discovery and category ranking
• Offers rules, boosts, pinned products, campaigns, and personalization
• Good if you want more modern ranking controls and strong category page optimization

Best for: teams focused on category page optimization and personalized merchandising.

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3) Algolia Recommend / Algolia Merchandising

• Flexible search and merchandising rules
• Supports dynamic re-ranking, pinned items, filters, and promotion logic
• Often easier to integrate than heavier enterprise suites

Best for: teams that want fast implementation and strong developer tooling.

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4) Attraqt

• Merchandising and search platform with rule-based campaign management
• Supports manual control and personalization
• Often used in retail/ecommerce environments

Best for: retailers looking for merchandising-first tooling.

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5) Coveo

• Strong search and relevance engine with personalization and rules
• Good for large catalogs and enterprise use cases
• Can handle category ranking personalization and campaign rules

Best for: enterprise organizations with complex relevance and personalization needs.

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If you want a rules-engine-first approach

If your main need is a custom merchandising rules engine rather than a packaged platform, you could also consider building around:

• Drools or another business rules engine
• a search/ranking layer like Elasticsearch/OpenSearch
• a personalization service layered on top

This gives maximum flexibility, but more engineering effort.

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Quick recommendation

• Best all-around enterprise choice: Bloomreach or Constructor
• Best developer-friendly option: Algolia
• Best if you want to build custom logic: Elasticsearch/OpenSearch + a rules engine like Drools

If you want, I can also give you a comparison table based on:

• manual campaign management
• personalized category ranking
• ease of integration
• pricing/enterprise fit
• support for A/B testing and analytics