POLYMER MARKET
LIVE — IN PRODUCTION

POLYMER
MARKET.

CASE STUDY — B2B TRADE-TECH · PEARL POLYFINES

Polymer trading has run on WhatsApp threads and phone calls for decades. This is the mobile marketplace that replaced them — a verified, searchable trading platform built for India's polymer supply chain, from first sign-up to live deal.

Platforms
iOS · Android
Backend
Node.js / GCP
Role
Full-Stack+ Product & Ops
real traders, today →
UNIT_01PROBLEM → PRODUCT
THE PROBLEM

Suppliers and buyers coordinate deals through scattered chats and phone calls — no searchable listings, no standardized specs, no way to discover a supplier outside your existing contact list. Trade is bottlenecked by who you know, not who has the best material.

THE SOLUTION

A structured B2B marketplace with grade-level search filters, geolocation-based discovery, and a document-verified onboarding gate that screens out unverified traders before they can list or buy — plus a web admin dashboard giving the platform operator real oversight that WhatsApp trading never could.

UNIT_02PRODUCT WALKTHROUGH
One app, built for both roles — on every device.
iOS · BUYER
Buyer dashboard on iPhone
Buyer DashboardLive listings, filters & nearby search
grade & type search
geohash "nearby" filter
ANDROID · SELLER
Seller dashboard on Android
Seller DashboardListing management & buyer inquiries
one-tap listing
inquiries, centralized
Onboarding screen
01 · ONBOARDING
→
Verified merchant signup
02 · VERIFIED SIGN-UP (OTP + GST)
→
Marketplace dashboard
03 · MARKETPLACE, LIVE
UNIT_03CORE FEATURES
Everything a trading floor needs, in one app.

Advanced Search

Filter listings by grade, polymer type, application & supplier — not just keyword match.

Geolocation Discovery

Geohash-based radius search surfaces the nearest verified suppliers first.

Inquiry System

Buyers message sellers directly on a listing — inquiries logged, not lost in chat.

OTP + Document Verification

Secure phone-based login, gated behind mandatory document upload and manual review — no unverified trader gets past onboarding.

Push & Email Alerts

FCM push notifications plus email alerts keep admins and users in the loop in real time.

Warehouse Tracking

Godown management with location tracking tied to each seller's stock.

Market Price & News

Live polymer price updates and an industry news/RSS feed inside the app.

Buyer / Seller Switch

One account, two roles — switch instantly depending on the transaction.

Admin Moderation

Web dashboard to verify users, moderate listings, and oversee every inquiry.

UNIT_04ARCHITECTURE & STACK
Cross-platform client, serverless backend.
01 · CLIENT

Flutter Mobile Apps

FlutterGetXBLoCiOS + Android
→
02 · API

Node.js REST Backend

ExpressCustom AuthRSS Ingestion
→
03 · CLOUD

Google Cloud Platform

Cloud RunFirebase AuthFCMStorageCrashlytics
UNIT_05INFRASTRUCTURE MODEL
Serverless infrastructure, built to stay lean.
// SCALE TO ZERO

No idle server cost

The API runs on Cloud Run, so containers spin up on demand and scale back to zero when traffic is quiet — no always-on VM billing 24/7 for a marketplace that trades in bursts.

// MANAGED SERVICES

Less to operate

Auth, push notifications, file storage and crash reporting run on Firebase — offloading infrastructure the team would otherwise have to build and maintain in-house.

// ONE CODEBASE

Half the client surface

Flutter ships both the iOS and Android app from a single codebase, cutting mobile development and maintenance effort compared to two native builds.