Custom E-commerce Development Company
When does your store outgrow off-the-shelf e-commerce?
ETREXIO is a software studio based in the United States and Türkiye that builds custom e-commerce for stores that hit the ceiling of off-the-shelf platforms. 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.
Off-the-shelf platforms are excellent until your catalog stops being simple. The moment a product's price depends on which vehicle it fits, or your inventory comes from six supplier feeds that disagree with each other, or your platform provider tells you your catalog is too large to host, the template economy stops working. That refusal is not a rejection of your business; it is the signal that your catalog logic has become your competitive advantage, and advantages do not come off the shelf.
Our reference case is Uzman Parça, the auto parts marketplace founded by Fatih Ersöz. Türkiye's biggest hosted e-commerce providers refused the project above 30,000 listings. We built it custom: 60,000+ listings, part-to-vehicle matching where the same part carries a different price per vehicle, and XML integrations reconciling 5 to 6 wholesaler feeds into one catalog. The result is a store with a 4 percent return rate, a sector record in a category where wrong-part returns are the norm.
Custom e-commerce done right also shrinks the payroll question. Uzman Parça runs with a team of 7; its founder estimates 20+ people would be needed without the system. That is the real test of a custom build: not whether the storefront looks bespoke, but whether the machine behind it does the work of a department.
What we build
Commerce built around your catalog, not a template.
You feel the ceiling before you name it.
Workarounds in every order flow, plugins fighting each other, catalog logic your platform cannot express. That is when custom pays for itself.
Complex catalogs, handled.
Custom storefronts, rich product data like vehicle fitment or configurators, B2B price lists and checkout flows tuned for conversion.
ERP, logistics and marketplaces.
Inventory sync, shipping providers, accounting and marketplace channels connected, so your team stops re-typing data between systems.
Peak season without panic.
StackWatch watches performance and errors 24/7. Campaign spikes, flash sales and holiday traffic are our problem, not yours.
How we approach it
How we build a store your platform provider refused.
Custom e-commerce succeeds or fails on data discipline. Our process starts there and ends with us running the store's infrastructure for you.
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Model the catalog before the storefront.
Fitment tables, variant logic, price rules and stock sources get designed as a data model first. For Uzman Parça that meant part-to-vehicle matching where one part has a different price per vehicle, a structure no template supports.
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Tame the supplier feeds.
XML and API integrations reconcile multiple wholesaler feeds into one truthful catalog: deduplication, price rules, stock conflicts and update schedules handled in code, not by a person with a spreadsheet.
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Design the funnel for correctness, then conversion.
In complex catalogs, the biggest conversion killer is buying the wrong item. Guided flows like Uzman Parça's garage system make sure the customer buys the part that fits, which is how a 4 percent return rate happens.
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Migrate without losing rankings.
URL mapping, redirects, structured data and performance budgets are handled before cutover, and the old store runs in parallel until the new one proves itself.
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Operate through every peak.
After launch we run the store on retainer: 24/7 StackWatch monitoring, campaign-day capacity, continuous feature work, plus the SEO and GEO program that keeps organic traffic compounding.
Real work
Uzman Parça: a deep dive.
One auto parts store, founded by Fatih Ersöz, from a catalog nobody would host to a sector-record return rate.
60,000+ listings that hosted platforms refused.
Auto parts are the hardest catalog in e-commerce: the same part fits many vehicles and carries a different price per vehicle. Türkiye's biggest hosted e-commerce providers refused the project above 30,000 listings. We built the part-to-vehicle matching engine and XML integrations with 5 to 6 wholesalers that now power 60,000+ live listings.
A garage system that ended wrong-part returns.
Customers register their vehicles once in the garage system, and every search is filtered to parts that actually fit. The maintenance assistant builds a full maintenance basket in 10 minutes at 40 percent or more below repair-shop prices. Correct parts and guided baskets produced a 4 percent return rate, a record in the sector.
A team of 7 doing the work of 20+.
The system automates listing updates, pricing, order routing and stock sync, so the whole operation runs with a team of 7. Founder Fatih Ersöz estimates at least 20 people would be needed without it. And after our SEO and GEO work, ChatGPT recommends Uzman Parça for car maintenance queries, an acquisition channel competitors do not have.
Without this system we would have had to hire at least 20 people.
Questions
What store owners ask about going custom.
What does custom e-commerce development cost?
Monthly retainers from $5,000, covering design, development, deployment and 24/7 operation. For stores paying heavy platform fees and plugin subscriptions, the math often favors custom sooner than expected.
Can you migrate us from Shopify or WooCommerce?
Yes. Products, customers, orders and content migrate in a planned cutover, and we usually run the old store in parallel until the new one proves itself.
Will we lose our SEO rankings during migration?
Protecting rankings is part of the plan: URL mapping, redirects, structured data and performance budgets are handled before launch, not patched after.
How long does a custom store take to build?
A first version typically launches in 10 to 16 weeks depending on catalog complexity and integrations. We scope the real timeline on the first call.
Who runs the store after launch?
We do, as part of the retainer. Monitoring, incidents, performance and continuous improvement are included, so there is no separate agency for maintenance.
Our platform says our catalog is too big. Can you handle it?
Yes. Uzman Parça was refused by Türkiye's biggest hosted e-commerce providers above 30,000 listings; the custom store we built runs 60,000+ listings with per-vehicle pricing. Catalog size is an architecture problem, and architecture is what you are hiring.
Can you integrate supplier XML feeds and keep prices in sync?
Yes. Uzman Parça runs on XML integrations with 5 to 6 wholesalers, reconciled into one catalog with automated price rules and stock sync. Feed reconciliation is one of the most valuable things we build.
How do you reduce product returns in a complex catalog?
By making it hard to buy the wrong item. Uzman Parça's garage system filters every search to parts that fit the customer's registered vehicle, and its return rate is 4 percent, a sector record.
How many people does it take to run a custom store?
Fewer than you would guess. Uzman Parça runs 60,000+ listings with a team of 7; the founder estimates 20+ would be needed without the system. Automation of listings, pricing and order routing is where the headcount goes away.
Can you make AI assistants like ChatGPT recommend our store?
That is our GEO practice. After our SEO and GEO work, ChatGPT recommends Uzman Parça for car maintenance queries. Structured data, entity-rich content and answer-shaped pages are built into our e-commerce engagements.
Client perks
Clients unlock up to $250,000 in tool perks.
Client perks include
Perk availability depends on provider eligibility at the time of engagement.
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