eCommerce App Development for Retail, B2B and Marketplace Brands

eCommerce app development scoped around the two things that actually break commerce builds: pricing logic a packaged platform cannot hold, and the peak day when every system behind the storefront is asked for more than it has ever given.

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The Storefront Is the Visible Tenth of a Commerce System

Commerce projects are rarely judged on the storefront, because the storefront is the part everybody can see and therefore the part that gets attention. What decides whether the platform works is the set of systems behind it: the record that holds stock, the system that prices a negotiated B2B account, the product data that has to read correctly on your own site and on three marketplaces at once, and the payment routing that changes the moment you sell into a second country.

Two failures come up repeatedly. The first is pricing and fulfilment logic that a packaged platform can almost express, which produces a customisation that fights every upgrade thereafter. The second is a catalogue and order path that behaves well at normal volume and queues at peak, where queueing means a customer sees stock that is already sold.

Both are architecture questions and both are cheapest to answer before the first sprint. Our engineers assess catalogue size, order volume and integration load first, and the recommendation that comes back is sometimes that a packaged platform configured properly will beat anything custom.

The layer that keeps stock, orders and customers consistent

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Teams Who Came to Us With a Systems Problem

Different sectors, one pattern: the constraint turned out to be the systems around the product rather than the product itself. These are platforms we build, integrate and keep running.

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eCommerce Development Services We Provide

Each of these is scoped against real trading conditions rather than a generic build: seasonal spikes, distributed catalogues, negotiated B2B pricing, and payment methods that differ by country.

Platform selection with the cost attached

We assess your catalogue size, order volume and integration load, then give you a direction with effort and running cost against it: packaged platform, headless build or custom architecture. It is an assessment rather than a vendor pitch, and it regularly concludes that configuration beats building.

Custom commerce applications

Native and cross-platform shopping apps, web storefronts and the admin tooling your merchandising and operations teams live in. Built where packaged platforms cannot hold your pricing logic, fulfilment rules or customer journey without a customisation that will fight the next upgrade.

Headless and composable builds

We separate the storefront from the commerce engine so a frontend release does not wait on a backend one, with one product and pricing source feeding web, app, kiosk and marketplace channels. The trade is real complexity for real independence, and we will tell you when your volume does not justify it.

Marketplace and multi-vendor platforms

Seller onboarding, commission models, split payouts, vendor catalogues and dispute handling. The operational layer is what decides whether a marketplace passes its first hundred sellers or drowns in manual administration, so that is where the build starts rather than with the buyer-facing surface.

Commerce integration

We connect storefronts to the finance, customer, product and fulfilment systems around them so orders, stock and customer data move continuously rather than in an overnight file drop that nobody notices has failed.

Replatforming and legacy modernisation

Ageing packaged or custom builds migrated in stages: catalogue and customer data first, then checkout, then peripheral services. The current store keeps trading throughout, because a commerce cutover with a dark window is a revenue decision disguised as a technical one.

Subscription, quick commerce and B2B models

Recurring billing, entitlement and dunning logic, rapid fulfilment flows, and B2B mechanics such as account-specific catalogues, quote to order, credit terms and approval chains. These are the models packaged platforms handle least well and where custom most often earns its cost.

The mobile engineering behind the shopping app · If what you are building is closer to a product than a store · The checkout and browse experience work

Work in This Sector

Work from across our portfolio. Studies from this sector appear here as they are published.

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Stories of Transformation and Trust

What clients say once the system has been running long enough to judge.

Reviewed on Clutch
Hardik was very helpful in advice and completing the work.
TomAustralia
Reviewed on GoodFirms
We have contracted a developer from Aipxperts now for several months, based on a referral. We have been very pleased with the quality of the work, the knowledge and skill level of our developer, and the value we're receiving for our fee. We also very much appreciate that the development team works at night (effectively), so we are sometimes able to turn client requests around in a day.There have been a couple of situations where we needed urgent help outside of our developer's normal business hours, and we've received that help (for which I am very grateful). While we have some challenges with communication sometimes, our overall satisfaction level is very high.
Jason LancasterPresident, Spork Marketing

Commerce Features for Shoppers, Merchandisers and Vendors

Shoppers, merchandisers and vendors are served by one platform and judge it on unrelated things. A shopper counts steps. A merchandiser wants to change a price without waiting for a release. A vendor wants to see their own settlement. The panels are specified apart because a screen tuned for one of them is actively bad for the others.

Customer panel

Browse, search and filtering that survives a deep catalogueProduct detail with variants, media and availability that reflects realityCart, saved items and a checkout designed around the drop-off points rather than the happy pathMultiple payment methods, including the local ones that convert in each marketOrder tracking, returns and support historyAccounts, addresses and reorder

Administration and merchandising panel

Catalogue, attribute and media management without a developer in the loopPricing, promotion and campaign rules, including scheduled changesOrder, fulfilment and returns managementStock across locations and channelsCustomer records, segments and service historyReporting on conversion, basket and margin

Vendor panel, for marketplaces

Onboarding, verification and catalogue submissionOrder, dispatch and returns handlingCommission, settlement and payout visibilityPerformance and dispute records

The Systems Behind the Storefront, and How We Connect Them

Each connection below is work we deliver. Together they are usually the majority of a commerce project, which is why they are assessed before an estimate rather than treated as a later phase.

Finance and customer systems

Order, stock and customer records kept consistent between the store and the systems your finance and sales teams already trust, with reconciliation that reports differences rather than quietly absorbing them.

Product information

One governed source for attributes, media and translations, so the same item reads correctly on your store, on a marketplace and in a retail partner feed. Where product data is the problem, this is usually the highest-return work on the project.

Payments and checkout

Multi-provider routing so you are not carrying one gateway into every market you sell in, plus the local methods that convert where card-only checkout does not. We build against payment providers rather than in place of one, and the money, tax and payout obligations stay with the provider and with you.

Search and product discovery

Typo tolerance, synonyms and merchandising rules over a deep catalogue, because a zero-result search is a lost order and it is invisible in most reporting.

Marketplaces and sales channels

Listing, pricing and inventory synchronisation, so a unit sold on one channel stops being sellable on another before somebody has to cancel an order.

Logistics and fulfilment

Carrier rate comparison, label generation, tracking events and returns processing wired into both the customer app and the administration panel.

What happens when a connection stops

A synchronisation that fails quietly overnight is the classic commerce outage, and it is usually discovered by a customer buying something that is already gone. Each connection is built to report its own failure, and the specifications behind it are handed over as documentation you own.

How the interface layer gets built and monitored

Building Commerce Around Card and Privacy Obligations Rather Than Behind Them

Payment and privacy rules decide where data may sit, what may be stored and what has to be logged, which makes them architecture rather than paperwork. They are scoped during discovery and translated into requirements a developer can build from.

Card data and PCI obligationsThe cheapest architecture is the one that keeps card data out of your systems entirely, using the provider’s hosted or tokenised flows so that the sensitive path never lands in your estate. That decision reduces your obligation dramatically and it has to be made before checkout is built, because retrofitting it means rebuilding the payment path.Strong customer authentication in EuropeAuthentication requirements change checkout flow, retry behaviour and how a failed payment is presented to the customer. Designed in, it costs a fortnight. Discovered after launch in a European market, it costs conversion while it is fixed.Privacy regimes across the markets you sell inConsent capture, lawful basis, residency, subject access and deletion, and an agreement with every downstream service that touches customer data. Selling into a second region usually adds a regime rather than replacing one, so the data model is built to hold more than one.Stores and apps aimed at childrenWhere a store or app is directed at under-13 users, a separate consent and data collection regime applies and is treated as its own requirement rather than a variation on the adult flow.AccessibilityStorefronts are built to WCAG 2.2 Level AA, written into the design files rather than assessed at the end. Conformance is not something we self-certify; a formal audit is a separate exercise with a different supplier. We also decline accessibility overlay widgets, which sell the appearance of compliance and do not survive contact with a screen reader.What our certification status does not do for youAipxperts is not ISO 27001 or SOC 2 accredited, and you should hear that here rather than at a security review. What we provide instead is the access management, change control, encryption and monitoring designed and documented, with the evidence prepared for whoever reviews it. Worth remembering when a certificate appears on a tender response: it covers how that supplier runs itself and says nothing about the platform they are about to build.

If a payment provider or enterprise customer is asking security questions

The Artefacts You Receive on a Commerce Project

These exist as artefacts rather than intentions, so the only question worth asking about each is whether you will be given it and when.

01A platform recommendation with the running cost attachedBefore anything is built you get a direction, the effort behind it and what it will cost to run, including the recommendation to configure a packaged platform where that is the right answer. We are not a reseller of any commerce platform and there is no margin behind the advice.02A checkout designed around where people leaveCheckout work starts from the drop-off points rather than the happy path, and the payment architecture is chosen to keep card data out of your systems wherever the provider supports it. That is a compliance decision and a cost decision at the same time.03Peak modelled before it arrivesThe platform is load-tested against your peak rather than your average, and the failure behaviour is specified: what queues, what degrades and what must never oversell. Commerce systems do not fail gradually, they fail on the one day the failure is most expensive.04Every connection reports its own failureCommerce systems are usually told they are broken by a customer rather than by their own monitoring. Each interface we build carries alerting on itself, so a stalled feed announces itself before it costs an order.05Documentation you could hand to somebody elseData mappings, event definitions and test scenarios come to you when the work ends. The test of a handover is whether a different team could pick the platform up from it, and that is the standard the documentation is written to.

The Engineering Behind a Commerce Platform

The choice follows your catalogue, your peak and whatever is already running. Nothing below appears because it looks good on a page.

Application languages

JavaKotlinSwiftPythonC#GoTypeScriptDart

Frameworks

Spring Boot.NET CoreReactAngularNode.jsFlutter

Data

PostgreSQLMongoDBRedis

Cloud and infrastructure

AWSAzureGoogle CloudDockerKubernetesTerraform

Commerce-specific work

caching and CDN strategy for catalogue and mediasearch indexingqueue-based order handling for peak

From Platform Decision to Peak Trading Day

The sequence front-loads the platform decision and the integration audit, because between them they set both the price and the ceiling.

01Trading and catalogue assessmentCatalogue size and structure, order volume, seasonality, markets and the pricing rules that packaged platforms struggle with. This is what produces the platform recommendation.02Integration auditEvery system the store must talk to, assessed for what it exposes and how often it can be asked. Commerce projects overrun here more than anywhere else.03Architecture and payment path designData model, channel strategy, caching, queueing and the payment architecture settled together, because the compliance footprint follows from the payment decision.04Experience designBrowse, search and checkout designed against drop-off rather than aesthetics, and the administration tooling designed for people who use it for six hours a day.05Build in increments reviewed by people who tradeEach increment ends with something merchandising and operations can use rather than a demo for a project sponsor. The people who will live in the admin tooling for six hours a day are the ones who find its problems.06Integration and reconciliation testingOrder, stock and customer flows validated end to end against staging systems, including the failure cases where one side is unavailable.07Peak load testingTested against your peak with the real catalogue, not a sample, and the degradation behaviour confirmed rather than assumed.08Launch and supportMigration staged so the current store keeps trading throughout. After go-live, monitoring covers interface reliability and performance, and support operates in business hours with the escalation path documented.

The Commerce Questions That Separate Suppliers

The first answer argues against building, one names a limit, and one tells you what to keep out of your own systems. Those are the answers a supplier chasing the work tends not to volunteer.

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When a packaged platform covers your catalogue, your pricing and your fulfilment rules, and the reason for building is a licence fee. Configuration wins on cost and time to value in that case and we will say so during the assessment. Custom earns its place when your pricing or fulfilment logic is the thing you compete on, or when a customisation is already fighting every upgrade.

Integration count and pricing complexity, far more than screen count. Two stores that look identical can differ threefold because one has a flat price list and the other has account-specific pricing across four channels. Both are assessed before quoting. No rate bands appear anywhere on this site, because a price offered before anyone has seen your catalogue and your integration list is a number somebody invented.

The storefront is rarely the critical path. Integration access, data cleanliness and payment provider onboarding usually are, and product data is almost always messier than the team expects. We give an indicative schedule after the integration audit.

Headless gives you release independence and channel reach, and it costs real complexity in exchange. It is worth it when several channels share one catalogue or when frontend and backend release cycles genuinely conflict. Below that, it is a cost with no return, and a supplier recommending it universally is describing their preference rather than your situation.

Ideally by never holding it. Using a provider’s hosted or tokenised flow keeps the sensitive path out of your systems and reduces your obligation dramatically. That decision has to be made before checkout is built, because changing it afterwards means rebuilding the payment path.

We migrate in stages with the current store trading throughout: catalogue and customer data first, then checkout, then peripheral services. A commerce cutover with a dark window is a revenue decision, and it should be taken deliberately rather than inherited from a delivery plan.

It is tested against your peak with the real catalogue rather than a sample, and we specify in advance what degrades and what must never oversell. Commerce platforms do not fail gently. They fail on the one day the failure costs most.

No. We hold no reseller agreement and no partner tier with any platform, which is why the assessment can honestly end with a recommendation to configure a product rather than build one.

Performance and interface monitoring, security patching, and the tuning that only becomes possible once there is real traffic to tune against. Support is available in business hours and the escalation path is written into the agreement rather than described on a call.

The code, the data and the documentation, on terms set at the start rather than agreed under pressure at the finish. Data mappings are the part clients forget to ask for and the most expensive part to reconstruct, so they are listed explicitly.

Dive Into Our Insights

What our engineers have written up from work in this sector and the ones next to it.

When a store stops scaling · Reducing churn on a marketplace