Services · Mobile app development · Online marketplace apps
We provide marketplace app development in New York for retailers, wholesalers and startups that want independent sellers trading on one platform across the five boroughs and beyond. Codeeo builds the buyer app, the seller app and the operations console, and accounts for New York specifics: marketplace providers collect state and local sales tax for their sellers, the SHIELD Act sets data security duties, and city rules on app-based delivery pay can apply if your platform dispatches couriers.
New York buyers live in apartments, often without a car, and expect deliveries to reach a doorman building or a fourth floor walk-up without drama. Sellers range from Brooklyn makers to Garment District suppliers. The platform has to make both sides look reliable to each other.
200+ companies across the US and the UAEFrom a first store to a listed developer
Platform features
New York concentrates very different sellers within a short subway ride. Boutiques in SoHo and the West Village, makers and small brands working out of Williamsburg and Industry City, jewelers on West 47th Street, apparel suppliers in the Garment District, and food wholesalers at Hunts Point in the Bronx all sell in ways that a generic marketplace template does not anticipate.
Buyers are just as varied, and many shop in a language other than English. Multi-vendor marketplace app development in New York therefore starts with the delivery, trust and payment habits of the city, then adds the state rules every platform must follow. The features below are the ones we scope most often for New York clients; we help you rank them so the first release stays lean.
Addresses capture apartment numbers, buzzer codes, doorman instructions and safe drop preferences. Sellers offer same day courier, scheduled windows or carrier shipping, and buyers can choose pickup from a seller's shop or a partner locker when nobody is home to sign.
Fewer failed deliveries and fewer missing package disputes.
Since June 2019 New York has required marketplace providers to collect sales tax on sales they facilitate for marketplace sellers. Our tax integration applies the combined state and local rate for each delivery address, including New York City's rate, and the reports group sales by jurisdiction for filing.
Tax on vendor sales is right for Manhattan, Long Island and upstate alike.
For jewelry, watches, art and designer goods, sellers can require signature on delivery, insured shipping and identity checks for buyers above a set order value. Listings can carry grading reports and certificates, and payouts wait until delivery is confirmed.
Expensive items move with proof at every step.
When a seller passes the high-volume level defined in the INFORM Consumers Act, the console requests and verifies tax, bank and contact details, sends annual recertification prompts and suspends selling for those who do not reply. Buyers can report suspicious listings from any product page.
Your seller records stand up if regulators or brands ask questions.
If your marketplace dispatches its own couriers, the courier app handles routes, proof of delivery and earnings. New York City's Department of Consumer and Worker Protection sets minimum pay and tipping rules for restaurant and grocery delivery apps, so pay records and tip prompts can be built to match your counsel's view.
Courier pay is calculated and recorded, not estimated.
Many New York sellers also trade at weekend markets, holiday fairs and pop-up shops. Sellers can publish where they will be and when, let buyers reserve items for collection at a stall, and sync stock sold in person so online listings stay accurate.
Online buyers and market visitors see the same stock.
English and Spanish are the baseline, with Chinese, Russian, Bengali or other languages added where your sellers and buyers need them. Support messages can be routed to staff who speak the buyer's language.
Sellers and buyers across the boroughs use the app in their own language.
Restaurants, retailers and offices order on account with resale or exemption certificates, standing orders, delivery windows that respect building loading rules, and monthly statements. Each account can have several buyers with spending limits.
Trade customers reorder in a minute rather than by phone.
A platform payments provider charges the buyer once, splits funds between sellers, holds back your commission and pays out on your chosen schedule. It also keeps the per-seller payment totals needed for year-end 1099-K reporting.
Payouts reconcile to orders without a finance spreadsheet.
Missing package claims, wrong items and damaged goods open a case with photos, delivery scans, door camera notes and messages. Your team resolves it, and the record doubles as chargeback evidence if the bank gets involved.
Package disputes are settled on facts, not on who complains loudest.
Who it is for
Plenty of online marketplace app developers in New York can build a checkout. The harder questions are about sellers who share a single courier, buyers with no space to receive a large parcel, and the tax and privacy rules that come with running a platform in the state. These four starting points cover most of the conversations we have with New York clients, and each points to a different first release.
Apparel, food, flowers or office supplies: a B2B marketplace app for New York suppliers lets your trade customers order from you and from complementary vendors in one basket. We build account approval, price tiers, delivery windows suited to Manhattan loading restrictions, standing orders and invoices on terms, connected to the accounting or ERP system you already use. Drivers get delivery lists ordered by building, with notes on freight elevators and receiving hours.
Account pricing is visible only after a buyer is approved.
Brooklyn ceramics, Queens food producers, Harlem designers: hyperlocal marketplaces work in New York because buyers like knowing who made what. We focus the first release on simple seller signup, attractive listings, same day local delivery or pickup and fair payout timing, then add subscriptions or gifting once repeat buyers appear. Seller fees can be kept simple at launch and refined once you see which categories sell.
Local pickup often matters more than shipping in the early months.
Jewelry, watches, fine art and luxury resale need more trust than a typical marketplace. We build seller vetting beyond INFORM's minimum, certificate uploads, insured shipping, signature delivery, escrow-style payout holds and a private offer flow, so buyers and dealers can negotiate inside the app rather than off platform.
Authentication can be added through a partner service.
Your store or app already has New York customers, and you want more range without more stock. We add vendor onboarding, tax collection on marketplace sales, payouts and returns rules to your existing commerce setup, and keep loyalty and customer accounts working across your own products and vendor items. Your merchandising team keeps the final say on which sellers and products appear under your name.
Your existing customer accounts carry over.
Ways to work together
Codeeo has delivered 200+ projects across the UAE and the US with a team of 80+ across Dubai, Riyadh and Karachi, and is rated 4.7 from 23 Google reviews. We have no New York office; we work remotely with New York clients and run discovery, design reviews and demos by video call. A fixed scope launch build is the usual start, followed by a monthly retainer, and some platforms move to a dedicated team as they grow. Whichever route you choose, the code and accounts stay yours.
A defined build with a deadline
We agree what the product has to do, write it down with a price and a date, and build exactly that. Changes are priced before they are made, not discovered on the invoice.
A product that keeps evolving
Named engineers who work your hours, join your standups and stay on the codebase. You direct the backlog; we own the quality of what ships.
Something live that needs looking after
A monthly block of hours for improvements, fixes and the small requests that otherwise wait months. Unused hours carry for a quarter.
Technology
Native or cross platform apps, a web storefront for search, and a ledger-based backend for commissions, payouts, refunds and courier pay. Encryption, access controls, audit logs and breach response procedures are designed in from the start, in line with the safeguards the SHIELD Act expects. Hosting is set up in your own cloud account.
01Mobile
02Data and cloud
03Marketing and tracking
A buyer app, a seller app, an operations console and the rules that tie them together.
Buyers browse, pay and track orders. Sellers list items, manage orders and see payouts. Your team approves sellers, verifies them, resolves disputes and reviews reports. Under the surface sit a platform payments provider, a tax service and messaging. New York projects often add apartment delivery details, local courier dispatch, multilingual content and B2B accounts for restaurants or retailers. Which of these belong in the first release is decided with you in discovery, based on how your sellers already work.
Schedule a free consultation and get a written recommendation, with costs, before you commit to anything.
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