Trusted by Industry Leaders
Checkout failures, broken inventory sync, and payment errors cost revenue on every visit. STS validates your eCommerce platform end-to-end so customers complete their purchase, every time.
A broken checkout is lost revenue. A pricing error is a PR nightmare. A site crash on Black Friday is a disaster. In eCommerce, every bug has a direct cost. Users don't give second chances.
Cart and checkout bugs are the #1 revenue killer
A single broken promo code or payment error drives users to competitors. Cart abandonment caused by bugs is silent. You won't know it's happening until revenue dips and you dig into session recordings.
Overselling and phantom stock create fulfillment problems
Inventory discrepancies between your storefront and warehouse system result in oversold products, cancelled orders, and angry customers. These issues compound fast during high-volume sales events.
60%+ of purchases happen on mobile
UX bugs on small screens go unnoticed until they start costing conversions. Tap target issues, keyboard obscuring form fields, and broken mobile payment flows are common and consistently undertested.
ERP, shipping, and payment integrations break silently
Orders fall through the cracks when integrations between your storefront, payment gateway, shipping provider, and warehouse system fail. These failures are invisible until customers start calling.
Every checkout flow, payment method, promo code, and edge case tested across browsers and devices. Catch revenue-breaking bugs before customers do: guest checkout, account login, and multi-currency flows all covered.
Validate Shopify themes, PDPs, collection pages, and checkout flows across devices and browsers. We catch layout breaks, variant logic errors, and broken CTAs before they cost you conversions.
Simulate Black Friday traffic volumes. Confirm your platform handles spikes without slowdowns, errors, or cart data loss. Know your breaking point before your customers find it for you.
Whether you're on a major SaaS platform or a fully custom build, STS has the depth to test it properly.
Checkout extensions, custom themes, app integrations, and multi-storefront configurations tested end-to-end. Including builds delivered by Shopify partner agencies.
Bespoke eCommerce builds with unique logic, custom APIs, and non-standard checkout flows tested with the same rigor as any enterprise platform.
Frontend-backend separation introduces unique failure points. We test the full data flow from storefront UI through the commerce API layer and back.
STS worked with a Canadian eCommerce brand to validate their Shopify Plus checkout, payment integration, and inventory sync before a major product launch. The engagement covered all checkout flows, payment gateway edge cases, promo code logic, and inventory system synchronization across their storefront and ERP.
STS caught 23 defects during pre-launch testing, including 4 checkout-breaking bugs that would have prevented customers from completing purchases at launch. The team delivered on time with full coverage documented and zero critical escapes.
Trusted by Industry Leaders
The QA services most critical for checkout reliability, platform performance, and conversion-impacting defect prevention.
Checkout flow validation, cart logic, promo code accuracy, and payment gateway testing across browsers and devices.
Ongoing QA coverage for teams releasing continuously, including regression testing before every sprint and pre-event validation for high-traffic sale periods.
Load testing to ensure your store stays fast and stable when Black Friday and promotional traffic hits.
Automate your regression suite so frequent catalog and pricing updates don't require full manual re-test every sprint.
Yes. STS tests Shopify, Shopify Plus, and custom-built storefronts including headless architectures. We also support Shopify partner agencies directly, providing pre-launch QA validation across the client builds they deliver. For custom platforms, we work directly with your development team to understand the checkout logic, API structure, and integration points before designing the test approach. The platform changes but the methodology does not: end-to-end coverage, documented defects, nothing left to assumption.
All payment testing is performed in sandbox or test mode using the official test credentials provided by your payment gateway. Stripe, Braintree, PayPal, and others all offer robust test environments. We validate success flows, decline scenarios, timeout handling, and error states without ever touching live card data or processing real transactions. If your integration does not have a sandbox, we work with you to stand one up before testing begins.
Yes, and this is a standard part of every eCommerce engagement. Mobile is not an afterthought. It gets a dedicated test pass. We test across iOS and Android using real devices and emulators, covering the checkout flow from cart through order confirmation. Common mobile-specific failures we catch include tap target sizing on payment fields, keyboard overlapping input fields, Apple Pay and Google Pay integration issues, and responsive layout breaks at key breakpoints.
Yes. STS runs load and performance tests calibrated to your expected peak traffic, whether that's a flash sale, a Black Friday event, or a product drop with pre-built demand. We simulate concurrent users, measure response times under load, and identify the point at which your platform starts degrading. The output is a clear report: what your site can handle, where the bottlenecks are, and what needs to be addressed before you go live.
Most eCommerce engagements start with a scoping call to understand your platform, integrations, traffic profile, and launch timeline. From there, STS builds a test plan covering checkout flows, payment scenarios, integrations, mobile, and performance. Execution runs across your staging environment with defects filed directly into your issue tracker. Pre-launch engagements typically run 4 to 8 weeks depending on platform complexity. Ongoing retainers are available for teams releasing continuously or planning multiple high-traffic events per year.
A 30-minute call is enough to scope your platform, identify your highest-risk areas, and give you a clear picture of what we would test.