When off-the-shelf
platforms become
constraints.

We build custom commerce platforms for businesses whose models genuinely don’t fit Shopify or Magento - multi-vendor marketplaces, B2B portals, rental platforms, and global multi-market operations that need purpose-built architecture.

20+

Custom platforms built

100K+

SKUs on one platform

18

Markets, one codebase

Commerce Hub
Multi-Vendor
Marketplace
B2B
Portal
Multi-Market
Platform
Subscription
& Rental
B2B2C
Platform
AI
Engine

Commerce models we’ve
built from scratch.

We’ve built platforms for commerce models that no SaaS tool was designed to handle. Here are the most common.

Multi-vendor marketplace

Vendor onboarding flows, commission management, product approval workflows, dispute resolution, and vendor-specific analytics dashboards. Built for luxury retail, wholesale, and niche marketplaces.

Vendor portalCommission engineDispute management

B2B commerce portal

Account-based pricing, customer-specific catalogues, minimum order quantities, approval workflows, credit terms, and purchase order management. Replaces phone and email ordering for B2B manufacturers and distributors.

Account pricingPO managementCredit terms

Multi-market platform

A single platform serving multiple countries - localised pricing, tax calculation, payment methods, language, and fulfilment rules per market. One codebase, one catalogue, 18 storefronts (our record).

Multi-currencyTax automationLocal payments

Subscription & rental commerce

Subscription box, SaaS-style recurring billing, rental and hire platforms, or circular economy models - built on a custom billing engine that Shopify’s checkout simply can’t support.

Recurring billingRental logicChurn management

B2B2C platform

Platforms where you sell to businesses who sell to consumers - with separate portals, pricing layers, white-labelling per reseller, and consolidated reporting for the platform owner.

Multi-tier pricingWhite-labelReseller portal

AI built in from day one

Every custom platform includes an AI assessment in discovery - personalisation engine, demand forecasting, and intelligent search are designed into the architecture before build begins.

PersonalisationAI searchDemand AI

How we scope and build
a custom platform.

01

Commerce model audit

We spend the first week mapping your commerce model - vendor relationships, pricing logic, order flows, and integration requirements. This defines the architecture before any code is written.

Output: Architecture decision record + integration map
02

Domain modelling

We model your business domain in code first - products, orders, vendors, pricing, fulfilment - building the data layer that everything else depends on. Gets the hard thinking done early.

Output: Domain model + API specification
03

AI-First build

Platform build using our AI-First methodology - AI-assisted development, fortnightly demos, and AI personalisation and intelligence woven in alongside core commerce features.

Output: Working platform with AI layer active
04

Load testing & launch

Every custom platform is load tested to 3× your projected peak volume before go-live. Staged rollout with traffic migration to protect SEO and allow immediate rollback if needed.

Output: Live platform + full documentation
05

Managed & evolved

Post-launch managed services - monitoring, AI model retraining as your catalogue grows, and a dedicated squad for feature development.

Tech stack for custom platforms
Next.js 14Node.js / FastifyPostgreSQLRedisElasticsearchApache KafkaAWS multi-regionStripe / AdyenPython (AI layer)Contentful
MULTI-VENDOR E-COMMERCE

Crafting a Seamless Multi-Vendor Platform for an Expanding E-commerce Business

Developed a Magento-based multi-vendor e-commerce platform for a Bangladeshi marketplace, increasing vendor participation and streamlining operations with integrated logistics and user-friendly vendor management.

↑ Vendor participation
↑ Streamlined marketplace operations
↑ Integrated logistics management

Every custom platform includes: AI opportunity assessment · Full IP transfer · Milestone billing · ISO 9001 quality gates · Named Solutions Director

Read full case study

Does your commerce model
need a custom platform?

Tell us about your model - we’ll tell you honestly whether you need custom, headless, or a platform. No charge for the assessment.

Other eCommerce services

Tell us about your commerce project.

First conversation is always with a senior commerce architect - not a sales team. We’ll give you an honest assessment and a scoped proposal.

Email
sales@brainiuminfotech.com
Response Time
Within 16 business hours

NDA available before any conversation - countersigned within 24 hours.

Leaving Already?
Let us help you find the right services for your business!

Our expert will help you in:

  • the right solution for your business
  • A ballpark estimate
  • An estimated delivery time

Start the Conversation!

Reach Out to Our Team