E-Commerce & Marketplaces
Multi-sided platforms with real payment processing, real seller tools, and real operations.
E-commerce and marketplace work is different from building a regular website. Once money moves through the system, the failure modes change. The code has to be correct under concurrency, idempotent against retries, defensive about what third-party services actually do versus what their documentation claims, and aware that the application is now a target for both casual abuse and motivated attackers.
Multi-vendor marketplace architecture
We build platforms where any user can open a storefront with team roles, permissions, and a real seller dashboard. Storefront customization, product management, and order handling are designed to support sellers who run real businesses, not hobbyists.
Payments and fee logic
We have shipped on Stripe (Connect for marketplaces, standard for direct e-commerce), PayPal, Square, and several alternative processors, and we pick the right one for the model rather than defaulting to a favorite. Whichever provider you land on, we wire in the parts that actually go wrong in production: webhook reliability, idempotency, refund and chargeback flows, payout scheduling, and per-seller fee overrides where the marketplace needs them.
Multi-carrier shipping and fulfillment
We integrate EasyPost, ShipStation, or direct carrier APIs across Canada Post, UPS, FedEx, Purolator, DHL, and UniUni. Sellers get real rate quotes, label generation, and tracking without leaving the platform.
Inventory sync with existing storefronts
Sellers should not have to abandon their Shopify, WooCommerce, or custom store to list with you. We build bi-directional inventory sync so stock levels, prices, and orders stay aligned across platforms automatically, with conflict resolution rules that match how sellers actually operate.
Operational tooling and admin
Moderation queues, fraud signals, dispute handling, payout reconciliation, and platform analytics live in an admin panel built for the team that runs the marketplace day to day. Real ops needs more than a database GUI.
Public APIs and integrations
REST APIs with webhooks, MCP servers for AI agent inventory management, and CSV import tooling let your power sellers automate their workflows. The platform becomes more valuable as integrations multiply.
Discovery and scoping
2 to 3 weeksWe map the seller flow, the buyer flow, the payment topology, and the operational model. Marketplace projects are deceptively complex, and the early decisions about fees, payouts, and disputes determine whether the platform scales.
Foundation build
6 to 10 weeksWe ship the core marketplace: storefronts, listings, checkout, payments, and admin. The goal is a platform that can run real transactions end to end before we expand into adjacent features.
Integrations and operations
VariableShipping, inventory sync, third-party APIs, fraud tooling, and analytics get layered in based on what sellers and ops need first. Priority comes from real usage, not a spec written before launch.
Scale and handover
OngoingWe work with your team on performance, monitoring, and any extension you want to take in-house. Source code and documentation are yours throughout.
Our typical stack runs on Next.js and NestJS in TypeScript, backed by PostgreSQL with Prisma and Redis for caching and queues. Payment processing is wired in with full webhook handling for payouts, refunds, and disputes against whichever provider fits the model. Shipping integrates through EasyPost or direct carrier APIs.
Inventory sync is built around event-driven reconciliation, with conflict resolution rules surfaced to sellers when sources disagree. Background jobs run on BullMQ or similar queues. Observability covers payment failures, sync drift, and order lifecycle metrics so the ops team sees problems before customers do.
Can you build on Shopify or WooCommerce instead of from scratch?
Sometimes that is the right answer. If you need a single-vendor store with standard checkout, Shopify is usually faster. Multi-vendor marketplaces, escrow payments, and custom payout logic typically outgrow off-the-shelf platforms quickly, which is why we build custom for those.
How do you handle Stripe Connect onboarding for sellers?
We use Stripe's hosted onboarding for compliance and KYC, paired with our own verification flow for marketplace-specific requirements. Sellers can list before onboarding completes and get paid once Stripe clears them.
What does an engagement cost?
Marketplace MVPs typically run twelve to twenty weeks of build time. We scope after discovery and bill on fixed-scope milestones for the foundation, then time-and-materials for ongoing iteration.
Who owns the code?
You do. Source code, infrastructure-as-code, and documentation are delivered as we build. There are no proprietary frameworks you cannot maintain without us.
Can you integrate with our existing back office?
Yes. We connect to ERPs, accounting systems, CRMs, and warehouse software through APIs or direct database integration depending on what is available.
What happens at scale?
We design with horizontal scaling in mind from day one: stateless services, queue-driven background jobs, read replicas where they help. The harder scale problems are usually operational rather than technical, and we plan for those during discovery.
Building a marketplace?
We have done this before. Let us help you scope it before you write a single line of code.