Custom E-commerce Software: Headless Commerce, Fulfilment Automation and Conversion Optimisation

E-commerce continues to grow year after year, and competition is fiercer than ever. Consumers expect fast page loads, one-click checkout, transparent delivery windows and hassle-free returns. Brands that cannot deliver that experience lose customers to competitors who can. At the same time, rising advertising costs, logistics fees and the need to be visible across multiple channels squeeze margins for all but the most efficient operators. Platforms like Shopify and WooCommerce are excellent starting points for shops with a straightforward catalogue. When your operation becomes more complex, however, they start to constrain you. Multiple warehouses with separate cut-off times, dropship suppliers, B2B pricing alongside B2C, subscription models, or strict marketplace rules from Amazon and regional platforms do not fit neatly into a standard template. The result is a tangle of plugins, manual order fixes and a checkout experience that underperforms because the frontend is tied to platform limitations. Custom or headless commerce gives you full control over both the customer experience and the underlying business logic. The frontend (built with technologies like Next.js) is decoupled from the commerce engine, allowing marketing and UX teams to iterate rapidly without risking inventory errors or payment failures. The backend manages stock allocation, pricing, promotions, fraud detection and shipping as independent services that scale individually. Core Web Vitals are optimised by design, so speed is a foundation rather than an afterthought. The result is a platform that handles peaks, converts visitors into buyers and grows alongside your ambitions.

Pain points

• Limited customisability of standard e-commerce platforms when your business logic is specific. Features like B2B price lists, subscription flows or product configurators require expensive plugins that conflict with each other or degrade webshop performance.
• Complex fulfilment processes involving multiple warehouses, dropship suppliers and different shipping options. Order allocation happens manually or through simplistic rules, so the nearest or cheapest fulfilment location is not always selected.
• High cart abandonment rates caused by slow checkout, limited payment options and unclear shipping costs. Every extra second of page load time and every missing payment method costs conversion and revenue.
• Infrastructure that struggles to scale during traffic spikes. Social media campaigns or marketplace promotions generate sudden traffic surges that slow the webshop or make it unreachable, resulting in direct revenue loss.
• Rising fraud scores and chargebacks as international sales grow. Generic fraud detection tools are too broad, blocking legitimate orders or letting suspicious transactions slip through.
• PIM and content processes that run out of sync with inventory data. Product descriptions, images and specifications are managed in a separate system and propagated to the webshop with a delay, causing customers to order products that are not actually available.
• Marketplace integrations that each have their own feed specifications, commission structures and return policies. Manually maintaining product listings, pricing and stock levels across multiple channels leads to errors and inconsistencies.
• Insufficient visibility into the full customer journey, from ad click to repeat purchase. Marketing data, webshop data and fulfilment data live in separate systems, making attribution and customer lifetime value calculations unreliable.

Our solutions

• Headless storefront built in Next.js with server-side rendering for optimal Core Web Vitals (LCP under 2.5 seconds), A/B-testable checkout components and complete freedom in UX design. The frontend communicates via APIs with the commerce engine, so UX changes have no impact on inventory or payment logic.
• Order and inventory engine with allocation rules per warehouse, dropship supplier and cut-off time. The system automatically determines the optimal fulfilment route based on availability, proximity to the customer and shipping cost, including split shipments when beneficial.
• Integrations with payment service providers (Mollie, Adyen, Stripe), BNPL providers and marketplace APIs with robust error handling, retry logic and automatic reconciliation. New payment methods are added as modules without disrupting the core checkout.
• Custom fraud rules with velocity limits, device fingerprinting, address validation and external scoring service integration. Rules are configurable per country, product category and order history so legitimate customers are not blocked.
• Observability stack with real-time monitoring, alerting and auto-scaling so campaigns and flash sales never cause 500 errors or checkout timeouts. Load tests are run before every major peak at volumes exceeding expected traffic.
• PIM integration that automatically synchronises product data, images and specifications with the webshop, marketplaces and advertising channels. Changes propagate within minutes, including validation for completeness and correctness per channel.
• Analytics platform combining marketing attribution, webshop conversion, fulfilment performance and customer segmentation in a single dashboard. Customer lifetime value, cost per acquisition and return on ad spend are visible per channel and per campaign.

Benefits

• Higher conversion through optimised checkout experiences with fast page loads, personalised product recommendations and all relevant payment methods. Every step in the funnel is data-driven and optimised for your specific audience.
• Faster time-to-market for new features, product launches and campaigns. The headless architecture enables marketing and UX teams to iterate independently of the backend without risk of technical regression.
• Lower operational costs through automated order management, intelligent fulfilment routing and fewer manual interventions. Orders flow from purchase to shipping label without anyone needing to touch them manually.
• Reliable uptime and performance even during traffic peaks. Cloud-native architecture with auto-scaling ensures that Black Friday, holiday seasons or a viral social media campaign do not cause revenue loss.
• Better insight into the full customer journey, from first click to repeat purchase. Integrated analytics make it possible to shift marketing budget toward the channels and campaigns that actually drive profitable growth.
• Reduced fraud risk through intelligent detection tuned to your specific market and customer segment. Fewer chargebacks and fewer wrongly blocked orders contribute to both revenue and customer satisfaction.

Technologies

Our approach

We combine analytics (funnel analysis, speed measurements, conversion data) with warehouse reality: where do orders drop off and where do things go wrong in fulfilment? First we stabilise the checkout and inventory accuracy, the two areas that typically have the greatest impact on revenue and customer experience. Then we expand with marketplace integrations, PIM synchronisation and advanced automation. Every release has a concrete conversion or throughput target, measured in the same environment as production. We work in two-week sprints with a joint demo after each sprint so stakeholders from marketing, operations and finance can provide direct feedback. Load tests are scheduled before every major campaign or seasonal peak.

How to measure success?

Key success metrics include conversion rate per checkout funnel step, average order processing time (from payment to dispatch-ready), percentage of cancelled orders due to inventory issues, chargeback and refund rate, page load time (LCP and Time to Interactive) and infrastructure cost per order during peak periods. We also track customer lifetime value, return on ad spend per channel and the percentage of orders processed automatically without manual intervention. Dashboards combine marketing, commerce and fulfilment data so every department operates from the same source of truth.