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SLMarketplace
How to build a marketplace platform — from categories to payment
A marketplace is not just a list of ads. We explain the order of decisions: categories and attributes, search, communication and monetisation.
Marketplace platforms most often fail when built as a generic "one list of ads for everything", copying existing big platforms without understanding the specifics of their own niche. Successful platforms, on the other hand, first deeply understand their concrete niche before writing the first line of code.
The correct order of decisions when building
1. Categories and attributes — first define what exactly distinguishes one listing from another in your specific niche. A tractor has a make, year, engine power and working hours; a flat has floor area, storey and room count — these differences must be built into the data model from the start.
2. Who publishes listings — private users, registered companies, or both (with special shop profiles for companies, with extra features like multiple simultaneous listings or brand highlighting).
3. Search and filters — how the buyer reaches a relevant offer fastest through category-specific attributes, location, and price range.
4. Communication between users — internal messages within the platform, the ability to save favourites, and notifications about new listings matching a saved search.
5. Monetisation at the end, not the beginning — premium listings with highlighting, paid packages for companies, or commission on successful transactions, depending on the model suiting your niche.
The biggest and most common mistake
Copying a generic classifieds model without adapting it to the specific niche is the most common cause of failure. A tractor and a flat fundamentally don't share the same attributes, and the category and search model must reflect that from the very start — trying to "add it later" usually means an expensive, painful rework of the platform's core architecture.
Nikola Cerić
Founder & CEO, Manage IT
More than 10 years of software development experience — in his own company and in major IT companies across the Balkans.