Marketplace Development Services by Alpha Expansion
Platform Engineering01Two-sided platforms02Split payments03Trust and safetyBook a call

Marketplace Development Services

Two sides,one trusted platform

We build two-sided marketplaces for founders and operators connecting buyers with sellers, providers or owners, including listings, search, bookings, split payments, payouts and the trust features both sides rely on.

Two-sided platformsSplit paymentsTrust and safety
Two-sided platforms
Split payments
01Our Approach

We design a marketplace around its transaction, then build the supply, demand and payment flows that make that transaction easy to repeat.

02Overview

Platforms where both sides can transact safely

  • 01Two-sided platforms
  • 02Split payments
  • 03Trust and safety

A marketplace is harder than a store because it serves two groups with different needs and moves money between them. We build service marketplaces, rental and sharing platforms, B2B procurement portals and niche vertical markets. That covers onboarding for each side, listings and search, booking or ordering, messaging, reviews, commission and fee logic, payouts through Stripe Connect and identity checks.

Build custom when your model does not fit a ready-made marketplace tool, for example unusual pricing, bookings with deposits, regulated participants or matching that is your real advantage. For a first version we focus on one transaction type and the minimum each side needs to complete it, because liquidity matters more than features early on. Operations tooling is planned from the start.

Talk to us about your project
03What We Do

Capabilities, End to End

01
Two-sided architecture

Separate accounts, dashboards and permissions for supply and demand on one data model, with listings, availability, orders and disputes structured so each side sees its own view.

02
Payments and payouts

Stripe Connect integration for onboarding sellers, splitting each payment, holding funds until delivery, taking commission and paying out, with refunds and chargebacks handled in the flow.

03
Search and matching

Faceted search, geographic filtering, ranking rules and recommendation logic that connect buyers with relevant supply, tuned with your data as the marketplace gathers activity.

04
Trust and verification

Identity verification through providers such as Persona or Stripe Identity, reviews tied to completed transactions, reporting tools and moderation queues that support your trust and safety policies.

05
Booking and messaging

Calendars, availability, deposits and cancellation rules for rentals and services, plus real-time messaging between participants with notifications and safeguards against taking deals off the platform.

06
Operator admin tools

An internal console for approving listings, resolving disputes, issuing refunds, adjusting fees and viewing marketplace health, so your team can run the platform without engineering help.

04In Production

What It Looks Like When It Ships

app.bazaar.io/overview
Live
Bazaar
Sellers / Overview
Search...
⌘K
MC
WORKSPACE
Overview
Sellers
Listings
Orders
MORE
Payouts
Disputes
Settings
Usage
72% of plan
Overview
Updated 2m ago
7d30d90d
Export
GMV
$1.24M
+14%
Active sellers
3,420
+6%
Orders
18,204
+11%
Take rate
12.4%
+0.6%
GMV over time
This periodPrevious
$1.24MJanFebMarAprMayJunJul
Breakdown
41%
Electronics
41%
Home
33%
Fashion
26%
Activity
Payout batch sent - 212 sellers
4m ago
New seller verified - Peak Outdoor
30m ago
Customer
Detail
Amount
Status
NG
Northwind Goods
Home - 412 listings
$48,200
Verified
AA
Atlas Audio
Electronics - 96 listings
$31,750
Payout due
L&
Linen & Co.
Fashion - 210 listings
$22,410
Verified
PO
Peak Outdoor
Sports - 58 listings
$9,880
Review
Two-sided platforms
Split payments
Trust and safety
Split paymentsDual dashboardsVerified profilesOperator console
05What You Receive

Handed Over, Ready to Run

SCROLL
01
Production marketplace web application
02
Buyer and seller onboarding flows
03
Stripe Connect payment and payout setup
04
Commission and fee rules engine
05
Search, filtering and ranking configuration
06
Reviews, messaging and notification systems
07
Operator admin and moderation console
08
Complete source code and environment access
06How It Runs

From Kickoff to Launch

01
Model the market
02
Scope version one
03
Build both sides
04
Launch and learn
01
Model the market

We define who the two sides are, what they exchange, how money and commission flow and which rules govern cancellations and disputes. This transaction model drives every later design and engineering decision.

02
Scope version one

We cut the first release down to one complete transaction loop, from listing to payout and review. Features that only matter at scale are noted on the roadmap and left for later.

03
Build both sides

Supply and demand flows are designed and built in parallel, with payments in test mode from the first sprint. You try real transactions on staging as each part of the loop is completed.

04
Launch and learn

We go live with monitoring on payments, search and messaging, onboard your first suppliers with you, and use funnel data from both sides to decide what to build or change next.

07Technology

The Stack We Use

ApplicationNext.jsReactTypeScriptNode.jsDataPostgreSQLPostGISRedisAlgoliaApplicationNext.jsReactTypeScriptNode.jsDataPostgreSQLPostGISRedisAlgolia
PaymentsStripe ConnectStripe IdentityStripe RadarPersonaServicesSocket.IOTwilioSendGridAmazon S3Amazon CloudFrontPaymentsStripe ConnectStripe IdentityStripe RadarPersonaServicesSocket.IOTwilioSendGridAmazon S3Amazon CloudFront
08Who It Is For

Built for Teams Like Yours

FLAGSHIP
You are launching a marketplace with a specific model

You understand your niche and have early supply or demand lined up, but your pricing, booking or verification rules do not fit a template product. You need a first version that completes real transactions safely and a codebase that can grow with the business.

Service and freelancer marketplaces
Rental and sharing platforms
B2B procurement and supplier portals
Niche vertical marketplaces
Adding third-party sellers to stores
Replacing a no-code marketplace
09Questions

What buyers ask before they start

If yours is not here, ask us directly. The first conversation is free and useful whether or not we work together.

Book a call

If you are still testing whether the market exists, a hosted marketplace product or no-code setup is a sensible way to learn cheaply. Build custom once you have evidence of demand and the tool limits you, typically on payment flows, booking rules, matching, fees or integrations. We can also start from an open-source base and customize it, which sits between the two options.

We normally use Stripe Connect. Sellers are onboarded as connected accounts, with Stripe collecting the identity and bank details it requires. When a buyer pays, the charge is split so your commission and fees are separated from the seller's share, and funds can be held until the service or delivery is confirmed. Refunds, disputes and payout schedules are handled by rules we configure with you.

Trust features are designed around the risks of your specific market. Common building blocks are identity verification at onboarding, reviews that can only follow a completed transaction, listing moderation, in-platform messaging with reporting, payment holds and limits for new accounts. We integrate fraud tooling from the payment provider and give your operators a console to investigate cases. Policies remain your decision, and we implement them.

Enough for one type of transaction to complete end to end. That usually means onboarding for both sides, listings, search, a booking or order flow, payment with payout, basic messaging, reviews and an admin console. Advanced matching, mobile apps, loyalty features and deep analytics can wait until you see real usage. A narrow first release also makes it easier to seed supply in one segment.

We choose an architecture that fits the first release and does not block growth. That means a relational data model with clear boundaries, search in a dedicated index, background jobs for payouts and notifications, and stateless services that can be scaled out. We avoid building for hypothetical volume upfront, and instead add caching, queues and capacity when monitoring shows where the pressure is.

10Related services

Often built together

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Premium digital product and engineering studio. We build high-performance web platforms, SaaS applications, mobile apps, and 3D experiences for high-growth companies.

Alpha Expansion is a premium digital product and engineering studio specializing in React development, Next.js development, full-stack development, mobile app development, UI/UX design, and 3D interactive experiences.

We serve industries including SaaS, FinTech, Healthcare, E-commerce, Logistics, and Real Estate.