Commerce platform for product discovery through checkout.
Commercial product engineering work. Interface shown with sample catalogue data.
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Commerce products fail in the details: search that does not convert, carts that lose state, checkout flows that break on mobile networks, and payment integrations that are hard to trust in markets with mixed payment methods.
The work was to build the unglamorous, high-consequence path — discovery to paid order — correctly on mobile first.
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Commercial product engineering on the Tarapint marketplace. Screens shown here use sample catalogue data; production catalogue and operational details remain private.
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A mobile-first storefront with clear product cards, readable pricing and low-friction path from listing to cart.
A cart and checkout flow that keeps totals, fees and payment method choice transparent at every step.
Payment integration with explicit states — pending, success, failure — so users and operators both know where an order stands.
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Mobile-first UI with large tap targets and readable type, because most marketplace traffic arrives on phones.
Cart and checkout implemented as explicit state machines so payment callbacks, retries and failures cannot corrupt order truth.
Payment methods cover both card and bank transfer — the reality of the market — with clear pending states instead of assuming instant card success.
Interface screenshots in this case study use sample data; live catalogue and vendor operations are not disclosed.
08 / Hard parts
Transfers are asynchronous; cards fail for many reasons. Modelling order state so a payment can arrive late, partially fail, or need manual reconciliation — without confusing the buyer — is the hard engineering.
Every additional round-trip costs conversion on weak connections. The flow was designed to validate locally where possible and treat the payment step as the only mandatory server round-trip.
Much of the system is commercially sensitive. The case study deliberately shows patterns and sample screens rather than production data, vendors or revenue — private work presented professionally, not apologised for.
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A functioning marketplace covering the full purchase path — discovery, cart, checkout and payment — delivered as commercial product engineering. Detailed performance and business metrics are private to the engagement.
Complete commerce path
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Evidence
Private
Production system (details withheld)
Demo
Interface screenshots with sample data
Case study
Architecture and checkout patterns
Technology
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