# Multi-Vendor Marketplace Development | Vendor Portal + Auto-Payouts | Alher Tech > Multi-vendor marketplaces with a real vendor portal, automated payouts, commission engine and SLAs. Built for B2B catalogs (Faire/Mirakl-style) and curated B2C. - Canonical page: https://alhertech.com/en/solutions/multi-vendor-marketplace/ - Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/) - Contact: https://alhertech.com/en/contact/ --- A marketplace where every seller can self-serve and every payout is automated: no spreadsheet stamping commissions, no manual onboarding bottleneck. ## What Multi-Vendor Marketplace Delivers - **A Vendor Portal Vendors Actually Like**: Multi-vendor is structurally different from a single-store marketplace: every seller has its own catalog, brand, performance dashboard, payouts and SLAs. The make-or-break is the vendor portal: if sellers cannot self-serve, your ops team becomes the bottleneck and your supply side stalls. We design the vendor portal as a first-class product, not an afterthought. - **Automated Payouts at Real Volume**: Stripe Connect, Mangopay or Adyen for Platforms: split a customer charge across many sellers, hold escrow until delivery confirmation, weekly payout cycle with automatic withholding for taxes where required. - **A Commission Engine You Can Reason About**: Per-vendor, per-category, tiered, promotional and time-windowed commissions, all expressible as composable rules. Marketing changes a rate; the change is reviewable in Git and applied without a deploy. - **Search and Ranking That Reward Quality**: Algolia or OpenSearch with vendor-quality signals (response time, fulfillment SLA, return rate). Vendors see exactly what would lift their rank, turning ops feedback into a self-improvement loop. - **Trust & Safety as a System, Not a Heroic Act**: Listing moderation queue with priority by vendor risk tier, dispute flow with chargeback evidence collection, fraud scoring on first-time buyers, return management with split-vendor logistics. - **B2B-Ready From the Start**: Account-based pricing, tax-exempt purchasing, volume discounts, MOQ enforcement and PO-based checkout: the things B2B buyers expect that B2C marketplaces never modeled. ## How We Build Your Multi-Vendor Marketplace - **Two-Sided Discovery**: We interview five buyers and five vendors before architecture. Marketplace failures are almost always supply-side failures we miss when we only listen to demand. - **Commission + Payout Modeling**: We codify the rules and ledger entries before any UI: every checkout, refund, return and dispute generates the right ledger entries from day one. - **Vendor Portal First**: Onboarding, catalog management, orders, performance and payouts, all live before the buyer storefront. Without the portal there are no products. - **Buyer Storefront**: Discovery, search, cart, checkout, returns. Wired to the same vendor data so a vendor change reflects in seconds. - **Trust & Safety + Ops Tools**: Moderation queue, dispute resolution flow, fraud rules, manual override tooling: the unglamorous stuff that keeps the marketplace alive. - **Soft Launch + Vendor Concierge**: First 20 vendors onboard with white-glove support so the portal gets refined where it actually breaks. From vendor 21+ it is fully self-service. ## High-performance stack used by global leaders React/Next.js/Angular on the frontend and Java 21 + Spring Boot + PostgreSQL 14 on the backend: the same stack that BBVA, ING, and Netflix use for their security and performance. ## Multi-Vendor Marketplace: FAQ ### How is this different from a regular marketplace build? A regular marketplace has one operator selling many products. Multi-vendor has many sellers each with their own catalog, payouts, branding and SLAs: the vendor portal is a full product surface, not a back-office view. That's where most of the engineering goes. ### How much does it cost? A focused multi-vendor MVP (one category, one country, one payment provider) is €90,000-€180,000. A scaled marketplace with B2B features, multi-country payouts and full ops tooling reaches €280,000-€600,000+. ### How long to launch? 14-22 weeks to a self-service vendor portal plus buyer storefront. Multi-country, multi-currency rollouts in 7-12 months. ### Why not Mirakl or Sharetribe? Mirakl is excellent if your GMV justifies €200K+/year licensing and your fit is close to their model. Sharetribe is a great prototype but escapes from it eventually. We build custom when you outgrow Sharetribe but cannot justify Mirakl, or when your model is structurally different. ### How are vendor disputes handled? Configurable workflow: buyer raises issue, vendor has X hours to respond, automated escrow hold, evidence upload from both sides, ops review, decision recorded with reasoning. Chargeback evidence packets are exportable in one click. ### Can vendors integrate via API? Yes. Public REST API for catalog sync, order webhooks, payout reports. We document it like a real product API: mid-market vendors expect this. ### How is shipping handled across vendors? Each vendor configures their own shipping zones and rates; the cart computes shipping per vendor and shows the buyer one combined cost. Multi-vendor orders split into separate shipments at fulfillment time, each with its own tracking. ### Do you work with clients globally? Yes. We work fully remote with clients across Spain, Europe, the US and LATAM. Time zones, video calls and live demos at every milestone.