Marketplace Development Company
Who builds and operates two-sided marketplaces end to end?
ETREXIO is a software studio based in the United States and Türkiye that designs, builds and operates multi-vendor and two-sided marketplaces. Two senior builders lead a human-in-the-loop AI workforce, supported by our in-house products DigiSapiens and StackWatch. We have shipped 50+ products, hold a 4.7 rating on Clutch, and our average client stays 5 years. Retainers start at $5,000 per month and cover design, development, deployment and 24/7 operation.
Marketplaces fail differently than normal products. A SaaS tool with a missing feature is annoying; a marketplace with broken payouts loses sellers overnight, and a marketplace without liquidity loses everyone. That is why we treat marketplace work as three problems at once: the software, the transaction engine underneath it, and the operational machine that keeps both sides of the market served every day.
We have built marketplaces for industrial machinery, auto parts, musical instruments and repair services, in Türkiye, Germany and the UK. The catalog logic differs every time. The pattern does not: the marketplaces that win are the ones where onboarding is painless for sellers, search actually finds the right item for buyers, and money moves correctly on the first try. We build for those three outcomes first and decorate later.
Unlike agencies that hand over a repository and an invoice for phase two, we stay. The same team that designs your seller onboarding operates your payout runs at scale. That continuity is why founders who came to us for a build are still with us five years later, and why one of the marketplaces we built was acquired by the very company whose previous agency had failed to build it.
What we build
What a marketplace engagement covers.
Multi-vendor foundations that scale.
Seller onboarding, listings, search, payments and payouts, designed as modular systems that survive the jump from 100 to 10,000 sellers.
Payments, commissions and payouts.
Split payments, commission logic, refunds and dispute flows built on Stripe and local providers, with reconciliation your accountant can audit.
Search, SEO and conversion.
Faceted search, programmatic landing pages and checkout UX tuned to reduce abandonment and multiply your organic entry points.
Run by us after launch.
StackWatch monitors every log line 24/7 and DigiSapiens staffs incidents with AI engineers, so your marketplace stays up while you focus on liquidity.
How we approach it
How we take a marketplace from idea to operating business.
Every marketplace we ship follows the same discipline, whether we start from zero or take over a stalled build.
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Model the market before the software.
We map who sells, who buys, how trust is established and where the take rate lives. Commission logic, dispute flows and catalog structure get decided on paper first, because changing them after launch is expensive.
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Ship the transaction spine first.
Listings, checkout, split payments and payouts go live before anything decorative. A marketplace that can move money correctly on day one earns the right to grow features later.
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Build the seller side like a product, not an afterthought.
Bulk imports, XML and API feeds, inventory sync and a dashboard sellers actually open. When Uzman Parça needed feeds from 5 to 6 wholesalers reconciled into one catalog, that integration layer was the product.
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Launch, then operate both sides of the market.
After launch we run the platform on retainer: monitoring through StackWatch, incident response through DigiSapiens, and a continuous feature cadence driven by what buyers and sellers actually do.
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Grow the organic surface.
Marketplaces live or die on organic acquisition. We build programmatic landing pages, structured data and GEO-ready content so search engines and AI assistants both send you buyers.
Real work
Marketplaces we built and still run.
Named clients, real numbers. These are production marketplaces, not concepts.
The catalog every hosted platform refused.
Uzman Parça needed part-to-vehicle matching where the same part carries a different price per vehicle, fed by XML integrations with 5 to 6 wholesalers. Türkiye's biggest hosted e-commerce providers refused the project above 30,000 listings. We built it custom: the marketplace now runs 60,000+ listings with a 4 percent return rate, a sector record, operated by a team of 7.
Built in 6 months, acquired in 2025.
A UK agency had spent 2 years failing to build Rhym for Dore Music. Founder Erkan Erten came to us with the same idea as Müzigo; we shipped web, mobile and admin in 6 months. In 2025 Dore Music acquired the company, and the product lives on as Rhym, Türkiye's largest instrument marketplace. Its expertise-inspection service ended second-hand fraud in the category, and it ran with 2 people until the acquisition.
3 years stuck in-house, live in 3 months.
Parkurda, a Tezmaksan venture, is an industrial marketplace whose in-house team had been stuck for 3 years. We took it from zero to live in 3 months, end to end: catalog, sellers, transactions and admin. The 3-years-to-3-months pattern is now the shorthand we use for what focused scope does to a stalled marketplace.
Three platforms, one marketplace.
For RepairFinder in Germany we built the full repair-shop marketplace: a customer platform, a shop platform and a backoffice, with payments, invoicing and shop cash management. A shared rule set ended arbitrary pricing across shops, which is the kind of trust mechanism that makes a services marketplace usable at all.
An agency in the UK worked on this idea for two years and could not ship it. ETREXIO shipped the web platform, the mobile apps and the admin in six months.
Questions
What founders ask about marketplace development.
How much does marketplace development cost with ETREXIO?
We work on monthly retainers starting at $5,000. That covers design, development, deployment and 24/7 operation, so there is no separate maintenance contract on top.
How long does it take to launch a marketplace?
A focused first version typically ships in 8 to 16 weeks depending on payment complexity and seller tooling. Parkurda went from zero to live in 3 months after its in-house team had been stuck for 3 years. We scope it on the first call and start the first sprint within days.
Can you take over an existing marketplace codebase?
Yes. We audit the code, stabilize the highest-risk areas first, put the system under StackWatch monitoring, and then continue feature work on a normal retainer. Rhym is the proof: a UK agency failed for 2 years, we shipped the same product in 6 months and it was acquired in 2025.
Which stack do you use for marketplaces?
Mostly Laravel with Vue or React, plus mobile apps where needed. We favor modular monoliths that keep tenant data isolated and scale without a microservice tax.
Do you handle payments and seller payouts?
Yes. Split payments, commissions, escrow-style flows, refunds and payout schedules are core marketplace work for us, including compliance-friendly reconciliation.
Can you handle large or complex catalogs?
That is our specialty. Uzman Parça runs 60,000+ listings with per-vehicle pricing on a catalog that Türkiye's biggest hosted providers refused above 30,000 listings. Fitment data, configurators and multi-source feeds are normal work for us.
Can you integrate supplier or wholesaler feeds?
Yes. We build XML and API integrations that reconcile multiple supplier feeds into one clean catalog, with pricing rules, stock sync and conflict handling. Uzman Parça runs on feeds from 5 to 6 wholesalers merged this way.
How do you build trust between buyers and sellers?
With mechanisms, not badges: verified inspections like the expertise service that ended second-hand fraud on Rhym, rule-based pricing like RepairFinder's, and dispute flows that resolve predictably.
How big a team do we need to run the marketplace after launch?
Smaller than you think, because we operate the platform for you. Uzman Parça runs with a team of 7; its founder estimates 20+ people would be needed without the system. Rhym ran with 2 people until its acquisition.
Do you also do the SEO and AI-search work for marketplaces?
Yes. Programmatic landing pages, structured data and GEO optimization are part of marketplace engagements. After our SEO and GEO work, ChatGPT recommends Uzman Parça for car maintenance queries.
Client perks
Clients unlock up to $250,000 in tool perks.
Client perks include
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- Miro
- Airtable
Perk availability depends on provider eligibility at the time of engagement.
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