Custom eCommerce Software Development for UK Sellers & 3PLs
Take your eCommerce operation further with backend systems built for real scale. We deliver end-to-end software solutions tailored for multichannel sellers and 3PLs.
eSellerHub: We engineer every layer of commerce
eSellerHub builds centralised eCommerce systems — backends and frontends that align operations, reduce friction, and boost reliability. Our custom software integrates with your stack so your business runs smoothly.
Building end-to-end eCommerce Software
Inventory Management Software
Real-time stock control across warehouses and channels.
Order Management Software
Unified order flow and exception handling across marketplaces.
Returns Management Software
Seamless returns processing, restocking and reporting.
Accounts Management Software
Integrate financial operations or embed accounting modules.
Catalog Management Software
Control your listings and product data across channels.
Warehouse Management Software
Efficient picking, packing, and stock handling across sites.
Seller Management Software
Manage vendors, relationships and interoperability across sellers.
Multi-Marketplace Retailing
Single backend to power multisite, multichannel operations.
FBA & FBM Software
Amazon workflows, inventory sync, performance reporting, order routing.
A holistic approach to empowering eCommerce
01
eCommerce App / Web Development
We build scalable storefronts and PWA / web apps to match your brand and workflows.
02
Business Consulting
We help identify process gaps, automation opportunities and growth strategies.
03
Software Integration & Migration
We upgrade or connect your existing systems: ERP, carriers, analytics, accounting.
Optimise, Automate and Scale your warehouse operations with confidence.
Growth across every business model
Whether you’re scaling direct-to-consumer sales, managing complex wholesale operations, running a multi-vendor marketplace, or integrating with manufacturer networks, eSellerHub delivers custom eCommerce software built for the UK market. Our solutions adapt to how you sell, not the other way round.
B2C Retailers
UX-first systems built to support growth, conversions and retention.
B2B Sellers
Complex pricing, bulk operations, and integrated transitions for enterprise models.
Marketplaces
Aggregated operations, vendor onboarding, commissions, returns.
Manufacturers
Order flow, inventory transfers, vendor & distributor workflows.
Transforming eCommerce with trusted expertise
With over 10 years’ experience, we combine domain knowledge and engineering discipline to deliver systems that scale. Our team includes developers, business analysts, and test engineers — all focused on commerce operations.
10+ years of commerce experience 
200+ tech experts 
Domain expertise across marketplaces and retail Digital World News
Frequently Asked Questions
1. What is custom eCommerce software?
Custom eCommerce software is built specifically around your operations, workflows and fulfilment processes rather than forcing your business into a generic platform template. . Unlike off-the-shelf SaaS platforms, custom systems adapt to your business model, integrations, and operational requirements. You maintain full ownership of the software, data, and infrastructure while gaining complete flexibility and scalability.
2. What's the difference between custom software and SaaS platforms?
SaaS platforms provide standardised functionality designed for broad use cases, while custom software is purpose-built for your exact operational needs. Custom development removes vendor lock-ins, app dependency limitations, and ongoing licence costs while giving you complete control over workflows, integrations, and automation. For growing UK eCommerce businesses and 3PLs, custom systems often deliver stronger long-term ROI and operational efficiency.
3. Does custom software support multichannel eCommerce sellers?
Yes. We build multichannel commerce systems that centralise inventory, orders, fulfilment, and reporting across Amazon UK, eBay, Shopify, TikTok Shop, WooCommerce, and other marketplaces in real time. This reduces overselling, eliminates manual processes, improves operational visibility, and speeds up fulfilment from a single backend system.
4. Can you integrate with my existing UK systems?
Absolutely. We integrate with leading UK business and logistics platforms including Sage, SAP, Xero, QuickBooks, Royal Mail, DPD, Evri, Amazon UK SP-API, eBay UK, Shopify, warehouse management systems, and HMRC Making Tax Digital (MTD) VAT requirements Integrations are designed around UK operational and compliance standards.
5. How long does it take to build custom software?
Project timelines depend on complexity, integrations, and system scope. Smaller operational tools may take 8–12 weeks, while mid-sized commerce or warehouse platforms typically require 12–20 weeks. Larger enterprise systems can range from 20–32 weeks or more. Following discovery, we provide a detailed roadmap with milestones, technical planning, and phased delivery timelines.
6. Is custom software more cost-effective than SaaS long-term?
In many cases, yes. Custom software removes recurring platform licence fees, reduces reliance on multiple third-party subscriptions, and automates operational tasks that consume internal resources. Over time, businesses often reduce operational overhead while gaining a system fully aligned to their workflows and growth strategy. .
7. What support do you provide after launch?
We provide ongoing technical support, performance optimisation, infrastructure monitoring, feature enhancements, security updates, and scaling assistance after launch. Support models are tailored based on system complexity, integrations, operational dependency, and growth requirements.
8. Why choose eSellerHub for custom eCommerce software development?
eSellerHub combines over 10 years of eCommerce and 3PL operational experience with a 200+ developer engineering capability through TOPS Infosolutions. We specialise specifically in commerce operations, fulfilment, warehouse management, marketplace integrations, and operational automation. Our systems are built around real-world operational challenges, not generic development assumptions.
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Our Offices
34173 Gannon Terrace, 
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