marketplace development

Marketplace development for B2B & multi-vendor platforms.

We've built 50+ marketplaces over 15 years. Senior developers direct AI agents to ship robust multi-vendor platforms at 5x speed.

Start a project → See our work

Key stats

2005

Established in Reading, UK

50+

Marketplaces built

7

Marketplaces operated today

60+

Five-star Google reviews

[ comparison ]

Code23 agentic delivery vs traditional agency

Feature
Code23
Typical agency
Delivery speed
5x build speed
Diagram then drift
Senior access
Operators on build
Consultants rotate
QA & security depth
Harden on payouts
Soft-launch excuse
Payment structure
50 / 30 / 20
Scope creep bills
Post-launch cover
90-day warranty + support tiers
Cold after go-live
AI transparency
Operator-directed agents
Black-box demos
what we do

Capabilities

01

Custom marketplace websites

Listings, search, messaging, reviews, admin and the full transaction loop - engineered from the data model out, not bolted onto a shop theme.

  • Two-sided platforms
  • Liquidity-first MVP
  • Next.js & Supabase
  • Operator mindset
02

B2B marketplace platforms

Trade accounts, quote flows, bulk ordering, credit terms and compliance for buyers who purchase on behalf of a business.

  • Account hierarchies
  • Quoted pricing
  • Approval workflows
  • Wholesale tooling
03

Multi-vendor commerce

Seller KYC, catalogue tools, commission rules and operator queues - the supply-side surface that decides whether liquidity ever forms.

  • Seller KYC
  • Vendor dashboards
  • Catalogue tools
  • Ops queues
04

Service marketplaces

Booking, availability, vetting and two-sided reviews for platforms that sell people's time. We operate several of these ourselves.

  • Matching engines
  • Bookings
  • Provider tooling
  • Category ops
05

Payments & Stripe Connect

Split payments, vendor onboarding, KYC, automated payouts, refunds and disputes - Stripe Connect as the default money path.

  • Stripe Connect
  • Split payouts
  • Multi-vendor commerce
  • Reconciliation
06

C2C & peer marketplaces

Peer listings, trust and safety, disputes and take-rate economics so casual sellers and buyers finish clean transactions.

  • Peer listings
  • Trust & safety
  • Disputes
  • Take-rate models
Related SaaS & Platforms → AI Development → Websites & Apps →
case studies

Selected work

Bid4Wine · Auction marketplace

Zero-latency live bidding with automated payouts

Bid4Wine
LIVE BIDDING AT SCALE
RevXtra · Automotive marketplace

Car buying where approved dealers do the competing

RevXtra
106 SCREENS DESIGNED
Costhetix · Service marketplace

A secure two-sided marketplace built around practitioner trust

Costhetix
TWO-SIDED PLATFORM
Virtualstock · Enterprise marketplace

Europe's largest dropshipping platform redesigned around its users

Virtualstock
ENTERPRISE MARKETPLACE OPS
engagement

How we engage

01

Project

Fixed-scope project

Scoped after Blueprint. Milestone payments. 90-day warranty on the build.

Start a project
02

Phased

Phased delivery

Discovery first, then build phases with clear gates. Scope locked per phase.

Map a phase
03

Retainer

Support retainer

Managed hosting, monitoring and continuous improvement from the team that built it.

See support tiers
how we ship

Process

  1. 01

    Map

    Supply, demand, take rate and the transaction loop land first - commercial truth ahead of architecture diagrams.

  2. 02

    Blueprint

    Listings, transactions, payouts and UI prototypes locked into a fixed-scope plan your operators can defend.

  3. 03

    Build

    Senior developers direct AI agents across marketplace surfaces in parallel, with review on every merge.

  4. 04

    Harden

    Payout edge cases, refunds and disputes get probed at machine depth before money moves in production.

  5. 05

    Launch

    Payments live, monitoring on, and a cold-start plan so supply is seeded ahead of buyers.

  6. 06

    Evolve

    Liquidity metrics, take-rate tuning and feature scaling - the same loop we run on the seven we operate.

testimonials

What clients say

We've recently completed Phase 1 of a bespoke business valuation tool with James at Code23, and I've been extremely impressed. He has taken the time to understand both the commercial and technical requirements, communicated clearly throughout, and delivered a well-thought-out system with a high level of flexibility. The admin dashboard, in particular, gives us full control over the scoring and valuation logic, which was a key requirement. I'm looking forward to working with James on Phase 2 and would have no hesitation in recommending him to anyone looking for bespoke software development – Jason Atkins, Director, Lansley Commercial

Jason Atkins a month ago

Code23 totally redesigned and rebuilt my online marketplace (WowThankYou) nearly 3 years ago, and have continued to support the site, and us, ever since. When things go wrong, they are quick to sort it. When we have questions, they go out of their way to answer us, and when better technology comes along that we ought to consider they tell us about it. Without James and his team I couldn't guarantee we'd still be trading! On behalf of WowThankYou, and myself, I can wholeheartedly recommend Code23 if you want a dynamic, stand-out website with the security of brilliant ongoing support. We look forward to many more years association with Code23

Tracey Kifford 11 years ago
faq

Questions about Marketplace Development

How much does it cost to start an online marketplace?

It depends on the number of sides, payments depth and how custom the MVP is. Blueprint defines the transaction loop and first release, then current pricing is confirmed against that agreed scope.

How long does marketplace development take?

The Blueprint MVP cut sets the timeline, including payments and first supply tools. Multi-vendor and B2B approval flows add time - we say so up front. Agents compress build; integrations and supply seeding usually set the critical path.

How to develop a marketplace?

Start with supply and the transaction loop, then architecture and payments. We run Map, Blueprint, Build, Harden, Launch, Evolve so commercial truth lands before UI expands.

How does a marketplace make money?

Commission on each transaction is the standard model. Listing fees, vendor subscriptions and featured placement sit alongside it. We model the take rate in scoping - that number decides whether the platform is a business.

Can AI agents really run marketplace operations?

Yes, inside a clear remit. Agents already handle outreach, listing enrichment, support triage and QA while seniors set policy and own risk - so you run lean without losing the operating judgement.

Which marketplaces do you operate yourselves?

Seven: Costhetix, Kinurture, BigSleep, WorkVans, Sponsorfy, Away Pubs and Jollee. We built each one and still run them day to day. Across 15 years we've shipped 50+ marketplaces in total.

Do you use Stripe Connect for multi-vendor payouts?

Yes. Stripe Connect is our default: split payments, vendor KYC, automated settlement, refunds and dispute handling, with reconciliation built in.

get started

Ready to build a marketplace that finds liquidity?

Tell us what you are trying to ship. We will map the first phase and a realistic budget.

Start a project Book a call